Hello!
A few months ago, I picked up a Sylvania RQ-3747 quadraphonic amp, EQ-3755 quadraphonic 8-track player, 4 matching sylvania large speakers, and 2 matching sylvania bookshelf speakers to use with my TV. When I went to pick them up, the guy had the amp and everything set up perfectly to hide a few issues with the amp and speakers.
All 6 speakers, the cone suspension(?) had turned to dust shortly after hooking up the speakers at my place. Unfortunately, the grills of the speakers are nailed on, so I wasn't able to check them when I bought everything. I paid the guy to fix the 4, and when I went to pick them back up, thats when he gave me the other 2 bookshelf speakers, which have yet to get fixed.
As for the amp, hopefully these issues are easily fixable:
First issue: When turning on the amp, theres a small "wump" sound as the amp turns on, and when I go to turn it off, it makes a"ssssSSSSWumpbump" or something similar. Is this an issue with DC offset, and if so, how would I go about correcting this?
Second issue: When I am watching something, or playing a game with moderate low tones / bass notes, the bass coming from the speakers is beyond excessive. I have the bass turned down for both channels, and even then, the sound can be very muddy at times. I have also noticed when there is a lot of bass / low notes going on, there will be random "pops / cracks" coming from the speakers, similar to what wiggling a loose cable sounds like. And on top of that, when the "crack" happens, the bass will go to a very reasonable level, before becoming super muddy again within a few seconds. Could this just be a dirty control issue, or is there a problem in the amplifying circuit?
Third issue: This one doesn't happen very often. Maybe once every couple days? Either way, sometimes when I am using the amp, a very subtle pop can be heard, then the audio starts buzzing / humming like there's a loose ground wire. A quick power cycle of the amp remedies this issue. Thoughts?
Any help would be greatly appreciated. I don't have the service manual, which is why I was holding off doing this work. I thought I would also ask here first before taking it to a local stereo repair shop.
A few months ago, I picked up a Sylvania RQ-3747 quadraphonic amp, EQ-3755 quadraphonic 8-track player, 4 matching sylvania large speakers, and 2 matching sylvania bookshelf speakers to use with my TV. When I went to pick them up, the guy had the amp and everything set up perfectly to hide a few issues with the amp and speakers.
All 6 speakers, the cone suspension(?) had turned to dust shortly after hooking up the speakers at my place. Unfortunately, the grills of the speakers are nailed on, so I wasn't able to check them when I bought everything. I paid the guy to fix the 4, and when I went to pick them back up, thats when he gave me the other 2 bookshelf speakers, which have yet to get fixed.
As for the amp, hopefully these issues are easily fixable:
First issue: When turning on the amp, theres a small "wump" sound as the amp turns on, and when I go to turn it off, it makes a"ssssSSSSWumpbump" or something similar. Is this an issue with DC offset, and if so, how would I go about correcting this?
Second issue: When I am watching something, or playing a game with moderate low tones / bass notes, the bass coming from the speakers is beyond excessive. I have the bass turned down for both channels, and even then, the sound can be very muddy at times. I have also noticed when there is a lot of bass / low notes going on, there will be random "pops / cracks" coming from the speakers, similar to what wiggling a loose cable sounds like. And on top of that, when the "crack" happens, the bass will go to a very reasonable level, before becoming super muddy again within a few seconds. Could this just be a dirty control issue, or is there a problem in the amplifying circuit?
Third issue: This one doesn't happen very often. Maybe once every couple days? Either way, sometimes when I am using the amp, a very subtle pop can be heard, then the audio starts buzzing / humming like there's a loose ground wire. A quick power cycle of the amp remedies this issue. Thoughts?
Any help would be greatly appreciated. I don't have the service manual, which is why I was holding off doing this work. I thought I would also ask here first before taking it to a local stereo repair shop.
