One weak channel

[Quailrancher]

I recently put together a home sudio system. It consists of an Onkyo C-7030 CD player, a Rockville REQ231 graphic equalizer, a Rockville RX230 crossover, A Fosi CB20A class D amplifier with subwoofer amp, and a Fosi subwoofer amplifier. The latter was purchased because there was no true crossover in the CB20A. Speakers are a pair of Polk Monitor 60 Series II and a Pioneer 10" Pioneer shallow mount subwoofer.

My problem is that I have a weak channel (left). Output is 10-20% of the right speaker. When I reverse the cables to the speakers, the weak channel moves to the right speaker. When I restore those connections and reverse the input to the amp, The speakers are reversed as well.

I can't use the headphones on the brand-new Onkyo to test because there is no output from the jack. I have no instruments other than a standard VOM, and I don't know how to test the components upstream from the amps. My money is on the Republic of China as the culprit, but that covers all the components, doesn't it? Any ideas other than buying more expensive stuff?

 

[TLS Guy]

I recently put together a home sudio system. It consists of an Onkyo C-7030 CD player, a Rockville REQ231 graphic equalizer, a Rockville RX230 crossover, A Fosi CB20A class D amplifier with subwoofer amp, and a Fosi subwoofer amplifier. The latter was purchased because there was no true crossover in the CB20A. Speakers are a pair of Polk Monitor 60 Series II and a Pioneer 10" Pioneer shallow mount subwoofer.

My problem is that I have a weak channel (left). Output is 10-20% of the right speaker. When I reverse the cables to the speakers, the weak channel moves to the right speaker. When I restore those connections and reverse the input to the amp, The speakers are reversed as well.

I can't use the headphones on the brand-new Onkyo to test because there is no output from the jack. I have no instruments other than a standard VOM, and I don't know how to test the components upstream from the amps. My money is on the Republic of China as the culprit, but that covers all the components, doesn't it? Any ideas other than buying more expensive stuff?

Reverse all the connection up stream of the amp, one by one, and see which unit the fault moves with. That will be the unit that needs service.

 

[Quailrancher]

Reverse all the connection up stream of the amp, one by one, and see which unit the fault moves with. That will be the unit that needs service.

I reversed the connections on all components and the weak speaker stayed the same except when I reversed them on the amp, which was my original suspicion.

 

[TLS Guy]

I reversed the connections on all components and the weak speaker stayed the same except when I reversed them on the amp, which was my original suspicion.

So you have a bad amp, that needs service or replacement.

 

[Quailrancher]

So you have a bad amp, that needs service or replacement.

Yes, I'm searching for an amp that fits my budget. Note that my system is budget compared to yours, which is gorgeous. Yours wouldn't even fit in my room. I have an old Sherwood receiver that I'll plug in if it fits on the shelf. At lease it wasn't made in China.

 

[TLS Guy]

Yes, I'm searching for an amp that fits my budget. Note that my system is budget compared to yours, which is gorgeous. Yours wouldn't even fit in my room. I have an old Sherwood receiver that I'll plug in if it fits on the shelf. At lease it wasn't made in China.

That is a $66.00 amp. I don't think you can seriously expect much at that price. I say this often, that junk purchases are the most expensive purchases you make.