Need help with a home theatre subwoofer - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 12th August 2014, 03:19 AM   #1
diyAudio Member
 
LATUBEGEEK's Avatar
 
Join Date: Mar 2013
Location: Orange County, CA
Default Need help with a home theatre subwoofer

I have a Panasonic SB-WA930 subwoofer, and want to power it up....Have schematics and pcb layouts, and the pinout for the 25-pin cable to it from the DVD player. Will not power up without DVD player plugged in...There must be some "permissives" that I can bypass/ground/fool to get it to work w/o the DVD unit, but don't know enough to figure it out. Any ideas/experience with this type of thing? All docs are in service manual (PANASONIC SB-WA930EE Service Manual free download, schematics, eeprom, repair info for electronics , click on "Get Manual", so-so pages attached). Thanks!
Attached Files
File Type: doc PWR 01.doc (97.5 KB, 8 views)
File Type: doc PWR 02.doc (70.5 KB, 3 views)
  Reply With Quote
Old 12th August 2014, 03:52 AM   #2
diyAudio Member
 
LATUBEGEEK's Avatar
 
Join Date: Mar 2013
Location: Orange County, CA
Got it working! There's a relay on the AC pcb...just jumpered it and voila! All the other amps should work as well (front, rear, surround, center). Not sure what to do with it.....
  Reply With Quote
Old 21st August 2014, 05:04 PM   #3
diyAudio Member
 
LATUBEGEEK's Avatar
 
Join Date: Mar 2013
Location: Orange County, CA
Default Home theatre amp update!

Have confirmed all six amps work (stereo front & rear, center & sub), and get "rated" power from each. For ex: center chl puts out 95Vp-p and 4.0A, before clipping. Allowing for scope probe impedance error and DMM reading a 1KHz signal, E x I x 0.707 = 270W (matches factory manual). For whatever that's worth....
Of course, each amp needs a preamp, and I will be putting everything from a guitar to a keyboard to a mixing board into these amps. The preamp I'm testing is from an old set of PC speakers (are you getting the idea this is low budget....?), which boosts a guitar sufficiently, as well as an MP3 player (when it's gain is lowered considerably - yes, two very different inputs!). I NEED to keep the preamp from clipping, and teenagers will be operating this.....
So I thought about an LED clip indicator - like a fuzz box I built once.... when the LED clips it lights up! Determine the proper series resistor to not let it clip until just before the preamp does, and voila??? Anyone done anything like this?
I need ingenuity/simplicity, not "just buy a stereo compressor-limiter...." Thanks!
Attached Images
File Type: jpg IMAG0547s.jpg (480.8 KB, 20 views)
File Type: jpg IMAG0548s.jpg (302.2 KB, 19 views)
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Home theatre maxximus Markaudio 71 14th April 2014 08:30 PM
Nice DIY LT Home Theatre SubWoofer BillPetrie Subwoofers 0 26th August 2008 12:05 AM
Using a Car Subwoofer for Home theatre sr2002 Subwoofers 20 2nd May 2008 12:24 PM
Car Subwoofer for Home theatre sr2002 Car Audio 2 29th April 2008 04:28 PM
Home Theatre bhg41088 Multi-Way 4 16th August 2004 01:32 PM


New To Site? Need Help?

All times are GMT. The time now is 02:13 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2