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Newbie Troubleshooting Question
I am new to using a separate amp and preamp so I apologize in advance if this question has an obvious answer. I recently purchased an ADCOM GFA-555 amp and a Hafler DH-101 preamp. Both are older units and work but... When the volume is turned all the way down, there is a slight hum in the right speaker that I can hear up to about 10 feet away but the left channel seems fine. There is also a very small amount of hiss coming from both speakers if you hold your ear within a foot of the speaker and the volume is all the way down. Using the balance control on the preamp to cut off the right or left channel does not make the hum go away. I read a little about ground loops and tried inverting the plug on the preamp and even moving it to a different outlet but it didn't seem to make any difference. I also tried switching cables from/to the amp/preamp. I also tried using a different inputs on the preamp. I did not try moving/switching speaker wires/channels.
MY QUESTION.....
Is there a simple method for me to determine whether the problem is in the amp or in the preamp? I'm hoping it's the preamp because I don't have much invested in it and can probably still get my money back on it.
Any suggestions will be greatly appreciated.
One other very minor issue which I'm pretty sure is the preamp. When you turn the volume all the way down the music is still audible. Not in a bleeding or feedback kind of way but just like the volume POT is not adjusted right. Again this is a minor issue I can live with but if it is a simple, idiot proof adjustment, I might be tempted to make it.
Thanks again for any input...
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- 15 posts total
- 15 posts total