Wire amp for more power

Reply Subscribe

Thread Tools

Search this Thread

Jun 16, 2007 | 03:20 PM

dono

Thread Starter

Gone but not forgotten.

Joined: Jul 2001

Posts: 6,521

Likes: 2

Wire amp for more power

I have a Sony amp with 2 100W channels. I have one channel wired to a 4ohm 8" (300W max power) subwoofer. I can see the speaker flexing to the music, but I would like more power. The specs say it can be wired as a monaural amp to produce 250W, but gives no wiring instructions (a call to Sony turned out to be a waste of time). Can anyone tell me how to do this?

Jun 16, 2007 | 06:58 PM

jake00

Hotshot

Joined: Apr 2004

Posts: 13,589

Likes: 2

From: NW burbs of chicago

what model Amp do you have?

Jun 16, 2007 | 07:52 PM

dono

Thread Starter

Gone but not forgotten.

Joined: Jul 2001

Posts: 6,521

Likes: 2

Quote:

Originally Posted by jake00

what model Amp do you have?

Sony XM-502Z

Jun 17, 2007 | 04:30 PM

Shamus

Senior User

Joined: Nov 2006

Posts: 182

Likes: 0

From: Oklahoma City

To achieve monaural, you combine the left and right channels so that no stereo signal is produced; it becomes one signal containing the data from both channels output as a single signal. This is a most common setup for car subwoofers. The wire this up, you simply attach the + seaker wire from the left connection to the back of the amp at the left speaker + and the - speaker connection to the back of the amp at the right speaker - terminal.
http://www.crutchfield.com/learningcenter/car/subwoofers_wiring.html?suboptions=2-Channel_1-4ohm-SVC&amptype=2-Channel#4193723196700778820

This should also have the same effect a bridging the two channels providing more power. The added power comes from reducing the resistance from 4 ohms to 2 ohms. Check your Sony owners manual to be sure but I think it is compatible in this manner.

Last edited by Shamus; Jun 17, 2007 at 04:33 PM.

Jun 18, 2007 | 05:50 PM

dono

Thread Starter

Gone but not forgotten.

Joined: Jul 2001

Posts: 6,521

Likes: 2

Shamus - Thanks for your help. With the door speakers replaced with better units, the stock speakers in place in back and the amped 8" subwoofer box in the middle back, it sounds pretty good.