Amp Modification

shajan · 5th January 2004, 06:04 PM

Hi all.

I was able to buy a powered sub really cheap from a store going out of business. The sub is one part of the Polk RMDS1 system. This is a Sat-sub system witha separate preamp which connects to the sub with the built in amps. According to the sales person, this sub will only work with Polk system. But for $25.00, I thought I'll take the risk.

The amp for the system(5 channels + sub) is built in the sub. Is there any way I can make a working amp out of its parts? It has a very heavy transformer that impressed me.

I can take digital pictures of the parts inside, and post it if anyone would like to try to help out.

Regards,

By the way, this site is just awesome. Can't believe that I just found it.

SY · 5th January 2004, 06:19 PM

You may already have a working amp with no need to scrap it for parts. At worst, you may have to diddle with some EQ. Have you investigated getting a service manual from Polk?

shajan · 5th January 2004, 06:25 PM

Sy,

It uses a db25 cable to send the preamp signals to the amp, but the problem is, Polk also sends a turn on signal through the db25 cable. I figured out that the signal is 24V, but when I rigged it, I hear the relay click once, and then nothing. I guess the amp is looking for something else.

SY · 5th January 2004, 07:21 PM

Yeah, you definitely want a service manual!

It shouldn't be too hard to trace the power wiring and figure out how to rig up a switch.

5th January 2004, 06:04 PM	#1
shajan diyAudio Member Join Date: Jan 2004 Location: Long Island	Amp Modification Hi all. I was able to buy a powered sub really cheap from a store going out of business. The sub is one part of the Polk RMDS1 system. This is a Sat-sub system witha separate preamp which connects to the sub with the built in amps. According to the sales person, this sub will only work with Polk system. But for $25.00, I thought I'll take the risk. The amp for the system(5 channels + sub) is built in the sub. Is there any way I can make a working amp out of its parts? It has a very heavy transformer that impressed me. I can take digital pictures of the parts inside, and post it if anyone would like to try to help out. Regards, By the way, this site is just awesome. Can't believe that I just found it.

5th January 2004, 06:19 PM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	You may already have a working amp with no need to scrap it for parts. At worst, you may have to diddle with some EQ. Have you investigated getting a service manual from Polk? __________________ "...we stumble and get up, we are sad, confident, insecure, feel loneliness and joy and love. There is nothing more; but I want nothing more.” - Christopher Hitchens 1949-2011

5th January 2004, 07:21 PM	#4
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Yeah, you definitely want a service manual! It shouldn't be too hard to trace the power wiring and figure out how to rig up a switch. __________________ "...we stumble and get up, we are sad, confident, insecure, feel loneliness and joy and love. There is nothing more; but I want nothing more.” - Christopher Hitchens 1949-2011

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5th January 2004, 06:25 PM	#3
shajan diyAudio Member Join Date: Jan 2004 Location: Long Island	Sy, It uses a db25 cable to send the preamp signals to the amp, but the problem is, Polk also sends a turn on signal through the db25 cable. I figured out that the signal is 24V, but when I rigged it, I hear the relay click once, and then nothing. I guess the amp is looking for something else.

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