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Brax NOX4B

4-channel car amplifier — 105 watts RMS x 4

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Our take on the Brax NOX4B

by Buck Pomerantz

My system has plenty of power. Who needs an amp?

You might think you don't need an amp because you have a 400-watt system in your car, or because your new stereo puts out 50 watts a channel. But those are peak wattage ratings, which may boil down to 15 or 20 watts per channel, using the more realistic RMS rating. An amp sends your speakers the power they need to deliver your music with clarity and impact, whether you're using factory speakers or high-performance components. And low-frequency reproduction requires lots of power, so an amp is an absolute must if you're adding a sub to your system.

Luxury sound

If you want the best possible car audio system with no compromises in sound quality, then Brax's NOX4B 4-channel amplifier should be powering your music. This gorgeous, hand-crafted workhorse brings an unprecedented level of high-fidelity amplification into the mobile environment. The NOX4B can put out 105 watts RMS to each of your front and rear speakers or components. Bridged for 2-channel operation, the NOX4B punches out up to 380 watts RMS each to a couple of subwoofers.

Build-quality that's off the charts

The massive heatsink tells you right away that this is a serious amp. Inside, the multi-layered circuit board is laid out in short, dedicated signal paths to deliver only the purest signal in the fastest time. Brax uses silver solder to secure each discretely mounted component for the best conductivity possible between them. Gold-plated connections eliminate corrosion to keep the signal flowing freely in or out of this amplifier.

Hi-fi features

Because handling music properly takes such a delicate touch, you won't find any crossover filters or bass boosts in this amp to color or sidetrack the sound from its final destination. Two separate power supplies ensure stability and dependability. The output power transistors have been hand-selected and measured to match each other so your music will sound consistent and strong. You'll want to display this amp proudly in your system. Hand made in Germany, each NOX4B comes with its serial number custom milled into the top nameplate.

Gold-plated connections eliminate corrosion

Highlights:

  • 4-channel car amplifier
  • 105 watts RMS x 4 at 4 ohms (180 watts RMS x 4 at 2 ohms)
  • 380 watts RMS x 2 bridged at 4 ohms
  • Class AB amp technology
  • 24-karat gold-plated RCA input, power, and speaker connections
  • double-sided circuit boards with silver-soldered components
  • hand-selected and matched transistors
  • preamp inputs
  • separate push-button gain controls with LED indicators on all 4 channels
  • no crossover filters or bass boost
  • 2- or 1/0-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • fuse rating: 100A x 1
  • 12-5/8"W x 2-1/4"H x 12-5/8"D
  • warranty: 2 years
  • Our 60-day money-back guarantee
Preliminary info from the manufacturer
Features and Specs
Performance
RMS Power Output (Watts x Channels)
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105 x 4
Peak Power Output (Watts x Channels)
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---
Power at 2 Ohms (Watts x Channels)
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180 x 4
Bridged Power (Watts x Channels)
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380 x 2
Minimum Impedance Bridged
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4
Minimum Impedance Unbridged
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---
Best Frequency Response
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20-20000 Hz
THD at Rated RMS Power
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---
Signal to Noise Ratio
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---
Input Voltage
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---
Features
Amplifier Class
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AB
Low-Pass Crossover Frequency
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N/A
Low-Pass Slope (dB/octave)
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---
High-Pass Crossover Frequency
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N/A
High-Pass Slope (dB/octave)
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---
Bass Boost
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No
Bass Boost Frequency
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---
Fan Cooled
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---
Fuse Rating
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100
Speaker Level Inputs
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---
Preamp Outputs
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1 pair
Width (inches)
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12-5/8
Height (inches)
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2-1/4
Depth (inches)
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12-5/8
Parts Warranty
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2 Year
Labor Warranty
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2 Year
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