one amp or two? - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

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 30th July 2006, 03:09 PM   #1
diyAudio Member
 
crippledchicken's Avatar
 
Join Date: Dec 2003
Location: south east mo.
Default one amp or two?

hi, i'm running a Dayton DVC 15" wired for paralelled 4 ohm load in a ported 4.7 cu ft. enclosure tuned to about 20hz. it's being driven by a rythmik audio 250 basic plate amp 250 watt rms into 4 ohm load. their manual says not to use driver with less than 3 ohm dc resistance in vented enclosures but, the dayton has like 2.6 or 2.7 ohms dc resistance and heat sink gets pretty warm especially when playing cd's without being driven all that hard. what are your thoughts on getting another 250 same type amp and use one amp per coil, which will put out 150 watts into 8 ohm load into each coil and will increase the dc resistance each amp will see for improved thermal stability? does this seem like a feasable idea? or would it have too many drawbacks? Thanks for your opinions!
  Reply With Quote
Old 30th July 2006, 05:07 PM   #2
wingman is offline wingman  Denmark
diyAudio Member
 
Join Date: Jan 2004
Location: jylland
Or you could use a fan on the heat sink
__________________
bass is music
  Reply With Quote
Old 30th July 2006, 05:26 PM   #3
diyAudio Member
 
crippledchicken's Avatar
 
Join Date: Dec 2003
Location: south east mo.
good idea thanks! i have a couple 12v. pc ps. fans i could use i'll try that.
  Reply With Quote
Old 30th July 2006, 06:44 PM   #4
diyAudio Member
 
Join Date: May 2006
Thats exactly what I did with my old velodyne that had a plate amp. I made a little rig that had 2 12V pc fans attached to a switchable 12V transformer. I attached it to the heatsink and made it fire into the fins to get airflow. Worked like a charm, the thing never even became warm to the touch.
  Reply With Quote
Old 30th July 2006, 10:26 PM   #5
diyAudio Member
 
crippledchicken's Avatar
 
Join Date: Dec 2003
Location: south east mo.
darn the bad luck! i got fans hooked up to amp pushed it a little harder but not much on a song with hard kick drum beats and after about 10 seconds, the plate amp cut out? heat sink was barely warm at the time and had to turn it to off and back on again? my 150 watt rms into 4 ohm plate that i have will get louder without thermal shut down than the 250 watter. any ideas maybe thermal sensing of the transformer windings? there is an extra pair of white wires on secondary side of the 250 watter of tranny, that goes to circuit board . Thanks for any ideas!
  Reply With Quote
Old 30th July 2006, 10:43 PM   #6
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
use two amps.
there is no down side other than the cost. All else is upside.

The amps will perform better into a double value load. and they will produce more power in total than the single amp and they will produce less distortion when driving a double value load. and they will stay cooler. and the output devices will stray less far from their SOAR. and and and.

Go on, buy a second plate amp and connect each Voice Coil separately to it's dedicated amp.
__________________
regards Andrew T.
  Reply With Quote
Old 30th July 2006, 11:09 PM   #7
diyAudio Member
 
crippledchicken's Avatar
 
Join Date: Dec 2003
Location: south east mo.
hi Andrew, i think your right! i don't have the funds right now but will later on and i will for sure, order another amp. should i feed both amps with both, left/right high level inputs as i am now doing with the single amp? Thanks!
  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



New To Site? Need Help?

All times are GMT. The time now is 02:45 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