Power your entire audio system with one amplifier—5-channel design delivers 500W to subwoofer plus 90W to each of four speakers.
Product Overview
The Nakamichi NKTA750.5 is a professional 5-channel Class A/B amplifier engineered to power complete automotive audio systems from a single compact unit. Delivering 90W x 4 channels for front and rear speakers plus dedicated 500W subwoofer channel at 2-ohm loads, this versatile amplifier eliminates the need for separate speaker and subwoofer amplifiers—simplifying installation, reducing wiring complexity, and saving valuable mounting space. With 3600W maximum power output, adjustable sensitivity (0.15-8V), less than 0.1% THD distortion, and greater than 90dB signal-to-noise ratio, the NKTA750.5 delivers clean, powerful audio across the full 20Hz-20kHz frequency range. The 420 x 267 x 87mm footprint and 2.6kg weight allow installation under seats, in boots, or behind panels where separate amplifier setups won't fit. Featuring dual 40A fuse protection and efficient Class A/B topology balancing performance with thermal management, this comprehensive amplifier represents the ideal solution for Australian drivers seeking professional audio quality across utes, SUVs, sedans, and 4WDs without the complexity and space requirements of multi-amplifier systems.
Key Specifications
Professional 5-channel Class A/B amplifier
Channels 1-4: 90W x 4 RMS at 2Ω (65W x 4 at 4Ω)
Channel 5 (subwoofer): 500W RMS at 2Ω (350W at 4Ω)
3600W maximum total power output
Full-range frequency response: 20Hz - 20kHz
Greater than 90dB signal-to-noise ratio
Less than 0.1% total harmonic distortion
Adjustable input sensitivity: 0.15V - 8V
Dual 40A fuse protection
Compact dimensions: 420 x 267 x 87mm
Lightweight construction: 2.6kg
Class A/B topology (efficiency + sound quality)
Complete system amplification from single unit
Features & Benefits
Complete System Solution: Single amplifier powers entire audio system—four speaker channels for front and rear speakers plus dedicated high-power subwoofer channel—eliminates need for separate speaker and subwoofer amplifiers, simplifying installation, reducing wiring complexity, cutting costs, and saving mounting space in vehicles with limited installation areas.
Powerful Subwoofer Channel: Dedicated 500W RMS at 2Ω subwoofer channel delivers serious bass output for single or dual subwoofer configurations—provides enough power for 10-inch or 12-inch active subwoofers, bass packs, or passive subwoofer enclosures without requiring separate monoblock amplifier purchase, installation, and wiring runs.
Quality Speaker Amplification: Four channels delivering 90W RMS each at 2Ω provide ample power for component speakers, coaxial speakers, or full-range systems—significant upgrade from factory headunit power (typically 15-25W), ensuring speakers reach full dynamic potential with improved clarity, bass control, and maximum volume without distortion.
Adjustable Input Sensitivity: Wide 0.15-8V sensitivity range accommodates factory headunits with low voltage outputs and aftermarket headunits with high-voltage pre-outs—allows proper gain matching for balanced system performance preventing distortion from over-driving inputs or weak output from under-utilizing amplifier capability, ensuring optimal sound quality.
Low Distortion Performance: Less than 0.1% THD ensures clean, accurate amplification without audible distortion—maintains audio quality at all volume levels during extended listening sessions on long Australian highway drives, regional touring, or daily commuting without listening fatigue from harmonic artifacts common in cheaper amplifiers.
Excellent Signal-to-Noise Ratio: Greater than 90dB SNR provides quiet operation without background hiss or noise—ensures music, podcasts, audiobooks, and hands-free calls sound clear and professional even during quiet passages or low-volume listening, critical for quality audio systems where noise floor matters.
Space-Efficient Design: Compact 420 x 267 x 87mm footprint and 2.6kg weight allow installation under front seats, behind rear seats, in side panels, or boot corners—fits locations where separate amplifier setups requiring multiple units won't accommodate, preserving cargo space in utes and wagons for touring gear and equipment.
Class A/B Efficiency: Class A/B topology balances sound quality with thermal efficiency—delivers clean power without excessive heat generation common in pure Class A designs while maintaining superior audio performance compared to Class D switching amplifiers, ensuring reliable operation during extended use in Australian heat without thermal protection shutdowns.
Technical Specs
Type: 5-channel automotive amplifier
Amplifier Class: Class A/B (high-quality topology)
Total Channels: 5 (4 full-range + 1 subwoofer)
Channels 1-4 Power Output: 90W RMS x 4 at 2Ω / 65W RMS x 4 at 4Ω
Channel 5 Power Output: 500W RMS at 2Ω / 350W RMS at 4Ω
Maximum Power Output: 3600W peak
Frequency Response: 20Hz - 20kHz (full audible range)
Signal-to-Noise Ratio: Greater than 90dB
Total Harmonic Distortion: Less than 0.1%
Input Sensitivity: 0.15V - 8V (adjustable)
Input Impedance: Not specified (verify from documentation)
Channels 1-4 Load: 2-4Ω per channel
Channel 5 Load: 2-4Ω (subwoofer)
Crossover: Built-in (verify specifications)
Bass Boost: Verify from product documentation
Remote Level Control: Verify compatibility
Fuse Rating: 40A x 2 (dual protection)
Operating Voltage: 12V DC nominal (10.5-16V range typical)
Dimensions (L x H x W): 420mm x 267mm x 87mm
Net Weight: Approximately 2.6kg
Cooling: Heatsink with convection (verify fan presence)
Connections: RCA inputs (channels 1-5), speaker-level inputs (verify), high-level inputs (verify)
Protection: Short circuit, thermal, DC offset (typical features)
Frequently Asked Questions
Can this amplifier power my entire car audio system from one unit?
Yes, that's exactly what 5-channel amplifiers do. Connect your front and rear speakers to channels 1-4 (90W each), connect your subwoofer to channel 5 (500W), and you've powered your complete system from a single amplifier. No separate amps needed—simplified wiring, reduced cost, less space required. Ideal for complete system upgrades.
What speaker and subwoofer combinations work best with this amplifier?
Ideal setup: Component or coaxial speakers rated 70-100W RMS on channels 1-4, and single 12-inch subwoofer (500W RMS 2Ω) or dual 10-inch subwoofers (250W each, wired for 2Ω total) on channel 5. Nakamichi NSE1658 6.5" speakers + NBX305A 12" active sub would be excellent pairing.
What power wiring do I need for this amplifier?
Dual 40A fuses mean approximate 80A total draw at maximum output. Use minimum 4-gauge power cable from battery with 80-100A fuse within 450mm of battery connection. Ensure quality ground connection (4-gauge to chassis metal). Verify your vehicle's alternator capacity (100A+ recommended) and battery condition before installation.
Does this amplifier include crossovers and bass boost?
Verify from product documentation. Most 5-channel amplifiers include low-pass crossover for subwoofer channel and high-pass for speaker channels, plus bass boost control. Check specifications for crossover frequencies (typically 50-200Hz adjustable), slopes, and bass boost range (0-12dB typical). External DSP provides more control if needed.
Will this amplifier fit under my front seats?
At 420 x 267 x 87mm (16.5" x 10.5" x 3.4"), it fits under many vehicle seats, but measure carefully. Check height clearance, seat rail positions, and allow airflow space for cooling. Alternative mounting: behind rear seats, side panels, or boot. Secure mounting essential—2.6kg amplifier requires proper brackets preventing movement during driving.
Compatible With / Goes Well With
Ideal Speaker Systems:
Nakamichi NSE1658 6.5" 3-way coaxials (70W, channels 1-4)
Nakamichi NSA-CS1721 6.5" components (70W, front channels)
Nakamichi NSE1648 6.5" coaxials (40W, channels 1-4)
Nakamichi NSE6958 6x9" speakers (75W, rear channels)
Most aftermarket 6.5" or 6x9" speakers rated 60-100W RMS
Compatible Subwoofer Systems:
Nakamichi NBX305A 12" active sub (channel 5: 350-500W)
Nakamichi NBX251A 10" active sub (channel 5: 150-350W)
Single 12" passive subwoofer (500W RMS 2Ω)
Dual 10" passive subwoofers (250W each, wired 2Ω)
Single 10" passive subwoofer (350W RMS 4Ω)
Essential Installation Accessories:
4-gauge amplifier wiring kit (power, ground, remote)
80-100A inline fuse holder (main power)
RCA audio cables (5-channel: 10-16 feet)
Speaker wire (14-16 gauge, adequate lengths)
Distribution block (if multiple power consumers)
Ground wire and ring terminals
Wire management ties and loom
Amplifier mounting brackets or board
System Enhancement Products:
Digital sound processor (advanced tuning)
Bass remote control (subwoofer level adjustment)
Voltage meter (electrical system monitoring)
Capacitor (optional electrical stabilization)
Sound deadening (improved audio quality)
Line output converter (if using factory headunit)
Recommended Headunits:
Aftermarket headunits with 4V+ pre-out voltage
Digital media receivers with subwoofer control
Apple CarPlay/Android Auto headunits
Headunits with time alignment and EQ
6-channel pre-out headunits (front, rear, sub)
Caution: Verify your vehicle's electrical system capacity. 5-channel amplifiers draw significant current at full output—ensure alternator rated 100A+, quality battery in good condition, and proper high-current wiring. Secure mounting essential for 2.6kg amplifier. Adequate ventilation required for Class A/B amplifier cooling. Professional installation strongly recommended for proper electrical system integration, gain adjustment, and system tuning.
Weight
2.6kg.Legendary Products & Support From Authorized Dealers
When you choose Frankies BrandBeast, you're choosing quality and performance. But just as important as what you buy is where you buy it from. Here's why purchasing from an authorized dealer is always the right choice:
▸ Expert Knowledge & TrainingOnly authorized Frankies BrandBeast dealers are factory-trained to sell and install our products. They have the expertise to ensure your purchase is set up correctly and meets your expectations.
▸ Authorized Warranty ProtectionWe offer one of the best warranties in the industry, but only purchases made through authorized dealers are covered. Don’t be misled by unauthorized sellers who can’t provide genuine warranty support.
▸ Reliable Customer SupportIf you ever run into an issue, you’re backed by Frankies BrandBeast’s official manufacturer’s warranty. No need to deal with overseas returns—our local team takes care of everything quickly and efficiently.
▸ Protect Your InvestmentBuying from an authorized dealer ensures you’re getting genuine products, full warranty coverage, and expert support. Ask yourself—is saving a few bucks worth losing all that?
Choose wisely. Buy from Frankies BrandBeast today!
Club Series 5-Channel Car Amplifier from JBL!
Compact sizeThe JBL Club A5055 amplifier features a low-profile chassis and a small overall footprint to fit in more vehicles where available space is limited.
High and low level inputSpeaker-level and low-level inputs allow the Club A5055 to integrate with both aftermarket and factory car stereo systems.
Variable crossover and bass boostUnlike many amplifiers available at similar prices, the JBL Club A5055 features variable electronic crossovers and bass boost circuits allowing for precise system tuning and performance.
Low noise and distortionThe Club A5055 has been engineered using Balanced Differential Inputs to ensure low noise and distortion even at high output levels. This also makes it far less susceptible to line induced radiated engine noise.
Input Level ControlWhen the low-level inputs are used, this control adjusts the input sensitivity between 200mVrms and 2.0 Vrms. When high-level inputs are used, this control adjusts the input sensitivity between 2Vrms and 20Vrms.
Full on-board protectionOn-board circuitry protects the Club A5055 from shorts, high-temperature, overvoltage and undervoltage. An LED indicator is provided to let you know when one of these conditions exists.
Phase SwitchThis switch changes the input phase to inverted or non-inverted. This is especially helpful with the subwoofer channel.
RBC wired remoteThe RBC wired remote is an easy installation and can be mounted for convenient volume adjustment from driver's seat.
Value engineered car amplifier with JBL power and performanceThe Club A5055 5-channel amplifier delivers a powerful 50-Watts RMS to each of the front and rear speakers in your car, and a pounding 500-Watts RMS to the subwoofer channel — a much smarter ratio of subwoofer-to-full-range power than what is typical in 5-channel amps. You can also bridge the amp to 3-channel mode to deliver 140-Watts RMS to your front speakers while driving your sub with 500-Watts RMS. Speaker-level inputs allow this amplifier to integrate into almost any system, even one using your car's factory radio. Separate high-pass and low-pass crossovers on the front and rear channels allow you dial in the perfect roll off to best suit speaker placement and cabin acoustics. The subwoofer channel features a low-pass crossover, selectable bass boost, and phase switch to optimize subwoofer performance.
JBL Club A5055 Specifications:
5-channel car amplifier
50 watts RMS x 4 + 320 watts RMS x 1 at 4 ohms
65 watts RMS x 4 + 500 watts RMS x 1 at 2 ohms
140 watts RMS x 2 bridged at 4 ohms + 500 watts RMS x 1 at 2 ohms
Front and rear channels
Class AB amp technology
variable high- and low-pass filters (32-320 Hz, 12 dB/octave)
Subwoofer channel
Class D amp technology
variable low-pass filter (32-320 Hz, 12 dB/octave)
variable bass boost (0-12 dB at 45 Hz)
phase switch (0, 180 degrees)
wired remote bass control module included
What's in the box:
5-Channel amplifier
Six 30A fuses (3 installed/3 spares)
4 Speaker to RCA adapters
RBC Remote level control w/ attached 16.5′ cable (RJ-25 terminated)
Four 2-1/8 screws
Two 3/8 screws
Logo badge w/ adhesive backing
Owner's manual
Legendary Products & Support From Authorized Dealers
When you choose JBL, you're choosing quality and performance. But just as important as what you buy is where you buy it from. Here's why purchasing from an authorized dealer is always the right choice:
▸ Expert Knowledge & Training
Only authorized JBL dealers are factory-trained to sell and install our products. They have the expertise to ensure your purchase is set up correctly and meets your expectations.
▸ Authorized Warranty Protection:
We offer one of the best warranties in the industry, but only purchases made through authorized dealers are covered. Don't be misled by unauthorized sellers who can't provide genuine warranty support.
▸ Reliable Customer Support:
If you ever run into an issue, you're backed by JBL's official manufacturer's warranty. No need to deal with overseas returns—our local team takes care of everything quickly and efficiently.
▸ Protect Your Investment:
Buying from an authorized dealer ensures you're getting genuine products, full warranty coverage, and expert support. Ask yourself—is saving a few dollars worth losing all that?
Choose wisely. Buy from an authorized JBL dealer today!
Polk Audio PA D Series 5-Channel Class D Amplifier: Polk Audio PA Series Amplifiers - Power & Style Without Compromise The Polk PA Series amplifiers were conceived, designed & engineered to deliver premium audio with unparalleled detail & reliability. Polk Audio PA D5000.5 Features: 5-channel car amplifier 70 watts RMS x 4 + 200 watts RMS x 1 at 4 ohms 100 watts RMS x 4 + 400 watts RMS x 1 at 2 ohms 200 watts RMS x 2 in bridged mode at 4 ohms + 500 watts RMS x 1 at 1 ohm Variable gain, high-pass filter (40-400 Hz 12 dB/octave), and low-pass filter (80-4000 Hz, 12 dB per octave) for front channels Variable gain and high-pass filter (40-4000 Hz 12 dB/octave) for rear channels Variable gain, low-pass filter (40-220 Hz, 12 dB/octave) and subsonic filter (20-38 Hz) for subwoofer channel Wired remote subwoofer level control Preamp inputs Fuse rating: 40A x 2 4-gauge power and ground leads recommended — wiring and hardware not included with amplifier 14-1/8"W x 1-13/16"H x 6-3/4"D Small Amp That'll Power Your Whole System Polk's PA D5000.5 5-channel amplifier may be small, but it can power your complete system, sending 70 watts RMS to each of your front and rear speakers and up to 500 watts RMS to a sub. Or, you can switch this little beast to 3-channel mode to drive a couple high-level components with 200 watts RMS each and still have that 500 watts RMS left over for the bass. Best of all, this powerhouse will fit in almost any location in your vehicle because of its convenient size and shape. Handsome with A Clear Voice Polk's Class D amp technology helps this amp reproduce music very cleanly, with no added coloration or distortion. Adjustable high- and low-pass filters help you to tune your system, keeping bass away from full-range speakers and high notes away from subs.You'll find that the subsonic filter's a big help for tuning your sub in a ported enclosure. Polk includes a wired remote, so you can control the subwoofer level from your front seat. This amp's tough, good-looking stainless steel case won't tarnish, even in very humid conditions. What's In The Box: Five channel amplifier Remote bass level control 17' Remote bass level control cable Four 40 amp ATO fuses (2 installed/ 2 extra) Four 1" Self-tapping screws Owner's manual (English/ French/ Spanish/ German/ Italian/ Portuguese) On-line product registration information
Legendary Products & Support From Authorized Dealers
When you choose Polk Audio, you're choosing quality and performance. But just as important as what you buy is where you buy it from. Here's why purchasing from an authorized dealer is always the right choice:
▸ Expert Knowledge & Training
Only authorized Polk Audio dealers are factory-trained to sell and install our products. They have the expertise to ensure your purchase is set up correctly and meets your expectations.
▸ Authorized Warranty Protection:
We offer one of the best warranties in the industry, but only purchases made through authorized dealers are covered. Don't be misled by unauthorized sellers who can't provide genuine warranty support.
▸ Reliable Customer Support:
If you ever run into an issue, you're backed by Polk Audio's official manufacturer's warranty. No need to deal with overseas returns—our local team takes care of everything quickly and efficiently.
▸ Protect Your Investment:
Buying from an authorized dealer ensures you're getting genuine products, full warranty coverage, and expert support. Ask yourself—is saving a few dollars worth losing all that?
Choose wisely. Buy from an authorized Polk Audio dealer today!
High-Performance Multi-Channel Class D Amplifier from JBL!
Class D DesignEvery Stadium amplifier, including the full-range models, features high-efficiency Class D topology. This technology allows JBL to engineer amplifiers that are more compact, generate less heat, and draw less current from the vehicle’s electrical system.
Low DistortionJBL Stadium amplifiers have been engineered to deliver the lowest distortion possible, enhancing the audio experience regarldess of output level.
Full On-Board ProtectionJBL Stadium amplifiers have on-board circuitry to protect from shorts, temperature, overvoltage and undervoltage. An LED indicator is included on all five models to let the user know when one of these conditions exists.
Proprietary High-Conductivity TerminalsAll JBL Stadium amplifiers come equipped with newly introduced E.A.R.L terminal for better grounding. For 5-channel and mono amplifiers, adapter connector is available in the box for easy installation.
Compact footprintWith it becoming more and more difficult to find spacious locations for amplifier mounting, JBL Stadium amplifiers have been developed in a small compact form factor to allow more location versatility.
Sleek designSometimes, an amp can be as stylish as it is powerful. JBL Stadium amplifiers have a clean, streamlined industrial design.
Full-Range Line OutputsThe full-range Stadium amplifiers (Stadium 5, Stadium 4 and Stadium 2) include full-range line outputs. This allows the audio signal to be routed to additional amplifiers or self-powered subwoofer solutions, increasing your system configuration options.
Uncover Great Sound (The Unveiling of Sound)Stadium mono and full-range, multi-channel amplifiers deliver the efficiency and power you expect from Class D amplifiers – and the performance you expect from JBL. The comprehensive all new E.A.R.L terminal and power adapter (5-channel & mono block) enables easy installation and optimized performance. For the 5-channel and mono amplifier models, the remote bass control allows the user to increase and decrease bass output independent of head unit tone controls. The industrial design not only provides an elegant look, but also enhances power dissipation to ensure long term reliability. Stadium amplifiers give you power to shape your car audio experience in new ways.
JBL Stadium 5 Specifications:
JBL Stadium 5
Class-D Full Range 4-Ohm Stable 5-Channel Amplifier
RMS Power Rating:
4 ohms: 75 watts x 4 chan. (200 watts x 1 chan.)
2 ohms: 100 watts x 4 chan. (350 watts x 1 chan.)
1 ohm: _ watts x _ chan.
1 ohm: ————N/A————
Bridged, 4 ohms: 200 watts x 2 chan. (350 watts x 1)
Total power output: 2300 watts
CEA-2006 Compliant Amplifier
Pulse Width Modulated MOSFET power supply
Wired remote bass level control included
LED power (green) and protect (red) indicators
Soft start turn-on
EARL Ground Terminal and Power Block
5/4/3/2 channel operation
Speaker-level (high-level) inputs
Preamp RCA outputs to daisy chain multiple amps
3-way protection circuitry (thermal, overload, and speaker short protection)
Dual speaker terminals simplify the hookup of multiple speakers
Heavy duty aluminum alloy heat-sink for extreme heat dissipation
Input sensitivity: 0.2V – 2V
Frequency Response: 10 – 320 Hz
Total Harmonic Distortion (THD): 0.01%
Signal to Noise Ratio: 80dB
Variable high-pass filter: 32 – 320 Hz, 12 dB/octave
Variable low-pass filter: 32 – 320 Hz, 12 dB/octave
Variable Bass Boost: 0 to +9 dB bass boost at 45 Hz
Fuse Rating: 30 A x 3
4 gauge power and ground wiring is recommended for installation
Power Specifications – Full Range Channels
RMS Power @ 4 ohms 75 watts x 4 channel
RMS Power @ 2 ohms 100 watts x 4 channel
Bridged RMS Power 200 watts x 2 channel
Power Specifications – Subwoofer Channel
RMS Power @ 4 ohms 200 watts x 1 channel
RMS Power @ 2 ohms 350 watts x 1 channel
RMS Power @ .5 ohm
Power Specifications – Subwoofer Channel
Peak Power @ .5 ohm
Amplifier Specifications
Amplifier Series JBL Stadium Series
Marine Certified No
Amplifier Class D
Number of Channels 5
Total Peak Power Output 2300 watts
Maximum Input Gauge Size 4 AWG
Minimum Impedance Unbridged 2 ohms
Minimum Impedance Bridged 4 ohms
Speaker Level Inputs Yes
Preamp Outputs 1 pair
Built-in Crossover Low-Pass (LP), High-Pass (HP)
High-Pass Crossover Frequency 32 – 320 Hz
Low-Pass Crossover Frequency 32 – 320 Hz
Signal-to-Noise Ratio 80 dB
Bass Boost 0 – 9 dB
Remote bass/level controller Yes
Fan Cooled No
Fuse Rating 30A x 3
Total Fuse Rating 90
Strappable No
CEA-2031 Compliant Yes
Amp Bluetooth Connectivity No
Hi-Res Certified No
What’s in the box:
Amplifier
Wired gain knob (wire attached)
Mounting screws (4)
Three spare fuses
User manual
Legendary Products & Support From Authorized Dealers
When you choose JBL, you're choosing quality and performance. But just as important as what you buy is where you buy it from. Here's why purchasing from an authorized dealer is always the right choice:
▸ Expert Knowledge & Training
Only authorized JBL dealers are factory-trained to sell and install our products. They have the expertise to ensure your purchase is set up correctly and meets your expectations.
▸ Authorized Warranty Protection:
We offer one of the best warranties in the industry, but only purchases made through authorized dealers are covered. Don't be misled by unauthorized sellers who can't provide genuine warranty support.
▸ Reliable Customer Support:
If you ever run into an issue, you're backed by JBL's official manufacturer's warranty. No need to deal with overseas returns—our local team takes care of everything quickly and efficiently.
▸ Protect Your Investment:
Buying from an authorized dealer ensures you're getting genuine products, full warranty coverage, and expert support. Ask yourself—is saving a few dollars worth losing all that?
Choose wisely. Buy from an authorized JBL dealer today!
Rockford Fosgate R2-750X5 Prime 750 Watt 5-Channel Full-Range Class-D Car Amplifier
A 750W 5-channel Full-Range Class-D car amplifier delivering 100W x 4 plus 350W x 1 at 2-ohm (CTA-2006 rated). Features independent front, rear, and subwoofer channel crossover control, Continuously Variable Punch EQ, variable infrasonic filter, C.L.E.A.N. gain calibration with per-channel output clip indicators, Rollback Protection, NOMAD speaker protection, RLC remote level control, and 2/4/5 channel input selection. Designed and engineered in Tempe, Arizona. Backed by a 1 year warranty.
Product Overview
The Rockford Fosgate R2-750X5 is a 750W 5-channel Full-Range Class-D car amplifier from the Prime R2 series, providing a complete single-amplifier solution for powering both car speakers and a subwoofer from the one unit. Rated continuous power is 50W x 4 plus 200W x 1 at 4-ohm, or 100W x 4 plus 350W x 1 at 2-ohm (CTA-2006, less than 1.0% THD+N). Dynamic power via PowerCube reaches 70W x 4 plus 241W x 1 at 4-ohm, and 114W x 4 plus 426W x 1 at 2-ohm. The front and rear full-range channels can also be bridged to 200W x 2 at 4-ohm.
The R2-750X5 provides fully independent crossover control for the front, rear, and subwoofer channels, each with their own high-pass and low-pass crossover adjustments at 12dB/octave Butterworth (50Hz-250Hz) plus a variable infrasonic filter on the subwoofer channel (15Hz-40Hz). A 2/4/5 channel input selection switch enables flexible integration with source units providing different numbers of RCA outputs, working for both RCA and high-level inputs. Three dedicated sets of RCA and high-level inputs cover front, rear, and subwoofer channels separately, with independent gain adjustment per channel group.
C.L.E.A.N. (Calibrated Level Eliminates Audible Noise) provides independent input and output clip indicators for front, rear, and subwoofer channel groups. A Continuously Variable onboard Punch EQ delivers up to 18dB of bass boost at 45Hz on the subwoofer channel. An RLC remote level control is included for in-cabin subwoofer volume adjustment. Rollback Protection, NOMAD speaker protection, and MEHSA4 heat management are all active. Cast aluminium heatsink with convection cooling. Designed and engineered in Tempe, Arizona.
Features & Benefits
Complete 5-Channel Car Audio System in One Amplifier: The R2-750X5 powers front speakers, rear speakers, and a subwoofer from a single unit, making it a space-efficient and cost-effective solution for full car audio builds without the need for two separate amplifiers.
Independent Crossover Control for Each Channel Group: Front, rear, and subwoofer channel groups each have independent high-pass and low-pass crossover controls at 12dB/octave Butterworth (50Hz-250Hz), plus a variable infrasonic filter (15Hz-40Hz) on the subwoofer channel and independent gain adjustment per group.
2/4/5 Channel Input Selection Switch: The input selection switch allows the R2-750X5 to integrate with source units providing 2, 4, or 5 channels of RCA output, working for both RCA and high-level inputs, removing the need for Y-cables in installations with fewer RCA outputs.
Continuously Variable Punch EQ - Up to 18dB at 45Hz: The onboard Punch EQ provides up to 18dB of continuously adjustable bass boost at 45Hz on the subwoofer channel, enabling subwoofer output to be tuned to the acoustic environment without a separate EQ or DSP.
Variable Infrasonic Filter - 15Hz to 40Hz Tunable: The subwoofer channel infrasonic filter is tunable from 15Hz to 40Hz at 12dB/octave, providing precise low-frequency protection across different subwoofer drivers and enclosure types.
C.L.E.A.N. Technology - Per-Channel Clip Monitoring: C.L.E.A.N. provides separate input and output clip indicator LEDs for front, rear, and subwoofer channel groups independently, enabling accurate gain calibration across all five channels.
RLC Remote Level Control Included: An RLC remote level control is included for in-cabin subwoofer output adjustment without returning to the amplifier.
Rollback Protection and NOMAD Speaker Protection: Rollback Protection dynamically manages output to prevent thermal stress on output devices during sustained high-output conditions. NOMAD provides real-time protection against shorted speaker wires and dangerously low impedances.
Technical Specs
Specification
Detail
SKU
R2-750X5
Number of Channels
5 (4 full-range + 1 subwoofer)
Total Power
750W
Rated Power - 4-ohm (CTA-2006, less than 1.0% THD+N)
50W x 4 + 200W x 1
Rated Power - 2-ohm (CTA-2006, less than 1.0% THD+N)
100W x 4 + 350W x 1
Rated Power - 4-ohm Bridged (CTA-2006)
200W x 2 (full-range channels)
Dynamic Power - 4-ohm (PowerCube)
70W x 4 + 241W x 1
Dynamic Power - 2-ohm (PowerCube)
114W x 4 + 426W x 1
Dynamic Power - 4-ohm Bridged (PowerCube)
234W x 2 (full-range channels)
Circuit Topology
Full-Range Class-D
Bridgeable
Yes (full-range channels)
Frequency Response
20 Hz - 20 kHz
THD + Noise
Less than 1.0% at 4-ohm and 2-ohm (all channels)
Input Sensitivity
Low-Level: 150mV - 4V / High-Level: 450mV - 12V
Signal Input
Front: 2 x RCA + 4-Pin Molex / Rear: 2 x RCA + 4-Pin Molex / Sub: 2 x RCA + 4-Pin Molex
Input Selection
2/4/5 Channel Switch (RCA and High-Level)
Tone Controls
Punch EQ: 0 to +18dB at 45Hz (Continuously Variable, Sub channel)
Front High-Pass Crossover
50 Hz - 250 Hz at 12dB/Octave Butterworth
Front Low-Pass Crossover
50 Hz - 250 Hz at 12dB/Octave Butterworth
Rear High-Pass Crossover
50 Hz - 250 Hz at 12dB/Octave Butterworth
Rear Low-Pass Crossover
50 Hz - 250 Hz at 12dB/Octave Butterworth
Sub Low-Pass Crossover
50 Hz - 250 Hz at 12dB/Octave Butterworth
Sub Infrasonic Filter
15 Hz - 40 Hz at 12dB/Octave Butterworth (Variable)
Remote Controls
Yes (RLC Remote Level Control included)
Power Wire Gauge
4 AWG
Power Input Connector
Compression Terminal Block
Speaker Wire Gauge
8 AWG
Speaker Output Connector
Compression Terminal Block
Cooling
Convection
Heatsink
Cast Aluminium
Operating Voltage
9 - 16 VDC
Recommended Fuse (not included)
120A
Max Current Draw at 13.8V Sinewave
71A
Visual Indicators
Power: Blue / Protect: Red / C.L.E.A.N. In: Red / C.L.E.A.N. Out Front, Rear, Sub: Blue/Red
Dimensions (H x W x D)
49 x 173 x 285mm (1.9 x 6.8 x 11.2 inch)
CTA-2006 Compliant
Yes
Warranty
1 Year
Compatible With / Goes Well With
The R2-750X5 suits a wide range of car audio installations requiring a single-unit 5-channel amplifier solution for speakers and a subwoofer. The 2/4/5 channel input switch makes it compatible with most factory and aftermarket source units.
Goes Well With:
R2D2-12 / R2D2-10 - Rockford Fosgate Prime R2 series subwoofers, a matched Prime series pairing for the subwoofer channel
R2-2X12 / R2-2X10 - Rockford Fosgate Prime dual loaded subwoofer enclosures for a complete drop-in bass solution
RFK4 - Rockford Fosgate 4 AWG amplifier wiring kit to complete the installation
DSR1 - Rockford Fosgate Digital Signal Processor for advanced signal processing ahead of the R2-750X5
Frequently Asked Questions
What is the difference between the R2-750X5 and the M2-750X5?
Both are 750W 5-channel Full-Range Class-D amplifiers with identical power ratings, the same 2/4/5 channel input switch, Punch EQ, variable infrasonic filter, and RLC remote. The M2-750X5 is from the M2 Element Ready marine series with conformal-coated PCB, UV stable powder-coated heatsink, zinc nickel-plated marine brass terminals, and Auto-Sense turn-on suited to marine and outdoor environments. The R2-750X5 is from the Prime R2 car audio series with a cast aluminium heatsink and standard car audio terminals. Choose the R2-750X5 for car audio; choose the M2-750X5 for marine or outdoor powersports applications.
What does the 2/4/5 channel input selection switch do?
The input selection switch configures the R2-750X5 to accept 2, 4, or 5 channels of RCA or high-level input. In 2-channel mode, the single front RCA pair feeds all five channels internally. In 4-channel mode, separate front and rear RCA pairs are used independently. In 5-channel mode, all three RCA input pairs (front, rear, sub) are used for full independent channel control. This removes the need for Y-cables when the source unit has fewer RCA outputs.
What fuse does the R2-750X5 require and is it included?
The R2-750X5 requires a 120A fuse, which is not included and must be sourced separately. Install the fuse as close to the battery as possible in the 4 AWG power supply line. The maximum sinewave current draw is 71A.
Can I add a subwoofer to this amplifier without a separate mono amp?
Yes. The R2-750X5 includes a dedicated subwoofer channel rated at 350W RMS at 2-ohm. This eliminates the need for a separate monoblock amplifier in most builds. The included RLC remote level control allows subwoofer volume to be adjusted from the cabin without accessing the amplifier.
Is the R2-750X5 compatible with a factory OEM head unit?
Yes. The high-level (speaker-level) inputs accept 450mV to 12V, allowing direct connection to OEM head unit speaker outputs without RCA outputs. The 2/4/5 channel input switch further simplifies integration by allowing the amplifier to work with source units that have limited or no RCA outputs.Legendary Products & Support From Authorized Dealers
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