Questions on gainclone powering a sub - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 17th August 2003, 03:00 AM   #1
diyAudio Member
 
Join Date: Sep 2002
Location: San Diego, CA
Default Questions on gainclone powering a sub

I am looking into building an 8 in subwoofer and planning to use a gainclone to power it. The sub is dual 8 ohm voice coil so I was thinking of using one power supply and 2 - LM3875, one per coil. Since this is for a subwoofer, is there anything I need to do extra? I think I will need to add a lpf but what else? Thanks.
  Reply With Quote
Old 17th August 2003, 03:03 AM   #2
diyAudio Member
 
Hybrid fourdoor's Avatar
 
Join Date: May 2003
Location: Ft. Worth, TX
Dude are you crazy?!?! I have an exact duplicate thread over in "Loudspeakers"

Just kidding...your not crazy
  Reply With Quote
Old 17th August 2003, 03:06 AM   #3
diyAudio Member
 
Hybrid fourdoor's Avatar
 
Join Date: May 2003
Location: Ft. Worth, TX
Btw these can be very usefull to you.

ELF processor

Linkwitz Transform

And you may want to consider the LM3886, a little more power available, especially since "Hi-Fi" isn't nearly a concern here
  Reply With Quote
Old 17th August 2003, 03:30 AM   #4
diyAudio Member
 
Join Date: Sep 2002
Location: San Diego, CA
hehe. I already looked into the Linkwitz Transform and the elf system, but I am trying to keep cost down. The power supply for the amp would be powering the chip at someting like +- 24v but the linkwitz circuitry will require something like +-15v so I will be needing another power supply right? Also it will require more power thus reducing the driver efficiency.

My sub is tune to 28Hz and seems to have flat frequency response up to about 30hz which is good enough for me. Making an 8in sub going lower seems kinda pushing it too much. I don't know that much though, someone else care to comment?
  Reply With Quote
Old 17th August 2003, 06:47 AM   #5
diyAudio Member
 
Hybrid fourdoor's Avatar
 
Join Date: May 2003
Location: Ft. Worth, TX
Look into discount or surplus electronic stores where you live. Theres one by my house that has bins full of old "wall warts" and notebook power supplys for cheap. It's 15V, but 250mA should be plenty I would think.

I wonder if it could run off the more common 12V power supplies.

I only suggested the linkwitz and ELF because I wanted to make mine very compact.
  Reply With Quote
Old 17th August 2003, 07:53 AM   #6
diyAudio Member
 
Join Date: Sep 2002
Location: San Diego, CA
Hmm...but dont you need like 4x the power to drive the sub though? I skimmed through the Elf article and the author says that say if you normally run at 100watts then with the elf you would need 400watts to have the same volume. I am not sure the gainclone will be able to power the sub.
  Reply With Quote
Old 17th August 2003, 07:59 AM   #7
diyAudio Member
 
Hybrid fourdoor's Avatar
 
Join Date: May 2003
Location: Ft. Worth, TX
Yes thats why im going with the Linkwitz...plus I'm only looking for extension down to like 40 or 50 Hz....Plus I don't really listen to alot of bass...I just use it accent the 98% of the frequencies.

But yes your right...a birdgeclones on a DVC driver would be great for ELF.....Bob Carver eat your sub out!
  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
Parallel gainclone questions ejn327 Chip Amps 6 6th January 2005 05:28 PM
Moron Gainclone Questions Kofi Annan Solid State 0 7th February 2004 03:15 PM
very simple gainclone questions wrl Chip Amps 4 23rd June 2003 07:01 AM
More gainclone questions :) elizard Chip Amps 48 25th April 2003 07:47 PM
Gainclone questions trespasser_guy Chip Amps 47 24th April 2003 01:02 PM


New To Site? Need Help?

All times are GMT. The time now is 10:55 PM.


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