PX4R - 250 Watts RMS x 4 @ 4 Ohm 4 Channel Amplifier

Sale price$ 599.99

According to Merriam Webster’s Dictionary, primo is considered to be “Of The Finest Quality”. Living up to that standard we proudly present another entry in the Massive Audio PRIMO series of Class D Amplifiers, designed and engineered in the USA. This PRIMO PX4R is a multi-channel Amplifier that easily delivers up to 250 Watts RMS to each of 4 Channels @4Ω and 700 Watts to 2 Channels bridged @4Ω in a rather small footprint. All PRIMO series amps use Mil Spec PCBs with Surface Mount Devices.

Inside you will discover full MOSFET high grade switching devices and you can be assured your investment will last as a result of our 5 way protection circuitry and LED Clipping Indicators for front & rear. Our built-in OEM Line Converter enables installation of this Amplifier in any system as a result of its input sensitivity adjustable up to 10V RMS with our Auto Turn On circuit and there’s a 12 Volt remote output for external 12 Volt devices. Adding to its “street cred” is its compliance with the Consumer Technology Association’s CTA 2006 Standards for Car Audio Amplifiers. Not only does it comply it actually outperforms these stringent standards All models are pretested and will outperform their published CTA 2006 rating. I.C.P. (In Car Performance) is the main design goal. 

Outside you will be impressed by a smooth polished aluminum surface with our logo glowing radiantly in blue, announcing to the world you’re in possession of PRIMO equipment. The end caps feature a variety of individual adjustments for front & rear levels, X1 / X10 Freq. Control Button for HPF / LPF adjustments, all to provide maximum system flexibility, plus a 0 – 12 dB variable Bass Boost on the rear channels. Additionally, the PX4R supports a "Docking Port" to plug in an optional custom matching 4 Farad Railcap Booster (RCP)


  • Full Range Crossover Mode Adjustable Between 10Hz - 200Hz or X10
  • Full Range Digital
  • X1 / X10 Freq. Control Button for HPF / LPF Adjustments
  • Extreme Power in a Small Footprint
  • Low Distortion Full Band Width for Sound Quality Tuning
  • Mil Spec Double Sided PCB design with SMD parts
  • Built-in noise reduction circuitry
  • Full MOSFET with High Grade switching devices
  • Built-in Auto Sensing turn on function (Hi-Inputs)
  • 12V Remote Output for External Devices (Hi-Inputs) 
  • Next Generation Advanced 5 Way Protection Circuitry
  • Illuminated Logo
  • Designed and Engineered in U.S.A.
  • CTA 2006 Standard Compliant 
2 Ohm RMS 350w x 4
4 Ohm RMS 250w x 4
4 Ohm Bridged 700w x 2
Input Level 0.4 ~ 10V (High or Low)
Freq. Response 10Hz ~ 20kHz
LPF 10Hz ~ 200Hz / x1 - x10
SubSonic (HPF) 10Hz ~ 200Hz / x1 - x10
THD at 4 Ohm Load 30% Rated Power <0.03%
S/N Ratio >110dB
Bass Boost Yes
Minimum Load 2 Ohm
Gain Remote n/a
Dimensions 10.15 (in) x 5.9 (in) x 1.9 (in)