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36 Posts
Discussion Starter · #1 ·
First two of several amps that I'll have for sale.

First up is a Helix HXA-40X 4 channel amp, super SQ, extremely flexible crossover system, small footprint. Complete with downloaded manual from Helix/Brax and original box and sticker. Specs as follows:

Cont. power rating @ 4 ohms 4 x 60/80 W RMS/Max
Cont. power rating @ 2 ohms 4 x 90/125 W RMS/Max
Cont. power bridged @ 4 ohms 2 x 180/250 W RMS/Max
Frequency Response 20 Hz-20 kHz,+/- 0.2 dB
THD 0.009%
TIM Distortion 0.016%
S/N Ratio >100 dB
Input Impedance 10kOhm
Input Sensitivity 350 mV-8.5 V
Fuse 30A
Dimensions (HxWxD) 1.25"x8.5"x11.6"
Weight 5.3 lbs.
Adjustable Crossover 15 hz-5000 hz HP/LP/BP

Looking for $330 shipped/OBO

Next up is a US Amps USA-442 4 channel amp. This amp retailed for $900 or so back in '96 when it debuted. It was only manufactured until '99 or so before it was shelved because it was too advanced for most according to Jeff Coleman. Really flexible, really complicated crossover system is what sets this amp apart..... SQ is rich and detailed. Quite rare, not too many floating around. Quick specs:

4 x 65W @ 4 ohms
4 x 90W @ 2 ohms
2 x 180W @ 4 ohms bridged mono
Anodized red heatsink with laser-etched logo
9/10 cosmetic condition
10/10 functionally

Looking for $300 shipped/OBO

New here, been lurking for a while but just joined. All my feedback is on eBay (username rytehahi) if anyone needs references. Any questions just post here, email or PM. Thanks for looking.


36 Posts
Discussion Starter · #6 ·
Workin' on the pics. Newtitan, sent pics to your email addy. Right now, having problems uploading pics to the board..... need to go home and resize. Anyone seriously interested, email me and I can pics to you today from my email.

Thanks for the interest. :)

36 Posts
Discussion Starter · #11 ·
JWSewell said:
Great looking feedback on E-bay!

I do have one quick question about the US Amps USA 442.
Can the crossovers be shut off?
I am in the market for a 4 channel but I am wanting to use the crossover on my CD8454 HU.
Yup. Amp can be run full range on all channels..... very flexible crossover system with tons of options.
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