Tj Bassi
Well-known member
- Joined
- Sep 18, 2005
- Messages
- 346
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Hi all,
First, my apologies for having been no more than an occasional visitor to this club for about the past year. Finally decided to register and take part in all of the interesting discussions......
I have been doing battle with a new (but older) Descent subwoofer for a few months. The unit was originally purchased by a friend about two years ago from a reputable dealer, but has sat in the box unopened until recently. He sold me the unit,still sealed, which I installed my system (Requests, Cinema, Marantz SR9200, Krell FPB 250m's) and fine it tuned using some of the suggestions from previous threads in this forum.
The sub sounds great, until you turn the processor's volume down, and then you notice the hum eminating from the unit. Not too bad on multichannel music, horrible on 5.1 movie soundtracks when the audio is at a lull.
So far I have tried all the usual fixes and nothing has made an ounce of improvement. It sounds like a ground loop noise, but the hum still exists when you remove the interconnect from the preamp (I am using the single LFE input). An electrician came over and moved some breakers around in the box, but that didnt help. Last call was to MartinLogan themselves, and they offered a hum fix, which was two replacement electrolytic caps for the power supply. That did not work either.
Simply having the signal cable connected to the sub starts the hum (It is a premium cable, however). Connecting it to the preamp makes the hum worse. Before trying ML again, I was wondering if anyone has gone through the same situation. I have never had a hum or strange noise in my system, but this one is killing me.
On another note, the folks at Martin Logan are exceptionally nice to talk to on the phone, same with Krell. Almost unheard of these days.....
Thanks,
Tj Bassi
First, my apologies for having been no more than an occasional visitor to this club for about the past year. Finally decided to register and take part in all of the interesting discussions......
I have been doing battle with a new (but older) Descent subwoofer for a few months. The unit was originally purchased by a friend about two years ago from a reputable dealer, but has sat in the box unopened until recently. He sold me the unit,still sealed, which I installed my system (Requests, Cinema, Marantz SR9200, Krell FPB 250m's) and fine it tuned using some of the suggestions from previous threads in this forum.
The sub sounds great, until you turn the processor's volume down, and then you notice the hum eminating from the unit. Not too bad on multichannel music, horrible on 5.1 movie soundtracks when the audio is at a lull.
So far I have tried all the usual fixes and nothing has made an ounce of improvement. It sounds like a ground loop noise, but the hum still exists when you remove the interconnect from the preamp (I am using the single LFE input). An electrician came over and moved some breakers around in the box, but that didnt help. Last call was to MartinLogan themselves, and they offered a hum fix, which was two replacement electrolytic caps for the power supply. That did not work either.
Simply having the signal cable connected to the sub starts the hum (It is a premium cable, however). Connecting it to the preamp makes the hum worse. Before trying ML again, I was wondering if anyone has gone through the same situation. I have never had a hum or strange noise in my system, but this one is killing me.
On another note, the folks at Martin Logan are exceptionally nice to talk to on the phone, same with Krell. Almost unheard of these days.....
Thanks,
Tj Bassi