MB-Quart-ONX4.125 - 13 months and it's DEAD

[Gregs///M]

I can repair it, if I can source out all the replacement parts. Usually power transistors go.

Hopefully they replace the whole amp.

GL

[Jean]

All connections are good, I've already checked everything before making this post and contacting the seller.

The rear two channels are bridged into a single 4ohm sub (svc). I know a thing or two about electronics and audio (build many home audio hifi amps/preamps/crossovers etc), just not happy that it failed so quickly.

I guess you can't expect much from these made in china amps.

Do you repair amps? I may open it up if they don't offer to replace it.

[Gregs///M]

I would first verify power during non operation before assuming your amp is toast. Particularly your ground cable. Verify both ends of the cable are indeed clean and corrosion free. Be sure the chassis end is touching bare metal.

You should see at least 12 volts on the main power cable and 12 volts on the remote turn on cable while the system is powered.

It is very rare to find a 4 channel amp overheat unless it is bridged to very low impedance using sub woofers.

Does your amp power indicator shut off or just the audio?

[Jean]

Just an FYI to those who are considering these "MB Quart" ONYX amplifiers.

This is my FIRST amplifier that failed in such short time, the last amplifier I've used lasted me through 3 cars and over 7 years? (Good old made in USA Phoenix Gold TI series).

http://www.sonicelectronix.com/item_...-ONX4.125.html

The amp above has been used in a very simple system-
Alpine CDA-105 headunit
Image Dynamics Components
Polk Audio DB12 svc 4ohm subwoofer in Luke's custom box.

Amp started turning off about a month ago, I didn't think much of it and thought maybe it got too hot and shut off...It would come back on after a few minutes and everything would be fine.

Now it won't even stay on for more than a couple of minutes at LOW volumes.

I've contacted Sonic Electronix to see if they'll go an extra mile to cover it, I told them I'll make sure to share my good experience on many forums and audio lists :D