Is there much sound difference in using multiple small caps - 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
Thread Tools Search this Thread
Old 15th November 2004, 02:56 AM   #1
mattjk is offline mattjk  United States
diyAudio Member
Join Date: Aug 2004
Location: Huntington Beach, Ca
Default Is there much sound difference in using multiple small caps

as opposed to a single large cap?

I want to use one 82000uf cap per channel. My case it too small to fit a pair, but I can stuff 16 - 10000uf caps, or 8 - 20000uf caps into the case.
  Reply With Quote
Old 15th November 2004, 03:11 AM   #2
quasi is offline quasi  Australia
diyAudio Member
quasi's Avatar
Join Date: Sep 2004
Location: Adelaide, Australia
The theory is that with multiple capacitors you reduce the overall inductance which is a bad characteristic of all capacitors.

The lower the inductance the better because this reduces the overal bypass impedance to gnd (or whatever).

If the parallel capacitors are of a good quality then yes you will get better filtering of the power supply this way. In my amps I generally try to use multiples rather than one big fat one.

Whether you would hear it in your setup is a suck & see exercise.

  Reply With Quote
Old 15th November 2004, 03:34 AM   #3
diyAudio Member
MrTransistorm's Avatar
Join Date: Nov 2003
Location: Atomic City, USA
I've read in many places that it can make a difference, but it depends on a few factors. I've never really explored this option, so I don't know if my impressions below are correct. Forgive me if I'm wrong.

1. The paralleled ESR of the multiple caps needs to be lower than the ESR of a single larger cap. When the rectifiers are not charging the caps, any current the amplifier draws from the PSU will discharge the caps through the ESR. All things equal, a lower ESR will mean more maximum current available to the amplifier.

2. Watch out for the ripple current rating of smaller caps. You could use simulation to figure out how much ripple current is present in the caps. The Duncan PSU Designer is an excellent tool.

3. Smaller caps may have lower impedance at higher frequencies. Unfortunately manufacturers don't generally publish impedance vs. frequeny plots of capacitors, so I don't know if this is really true.

EDIT: Oh yeah, I forgot about the inductance Paralleling would definitely lower that and make #3 true.
  Reply With Quote
Old 15th November 2004, 04:21 PM   #4
AndrewT is offline AndrewT  Scotland
diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
I have just opened up a commercial power amp and inside were 32 caps forming +/-34,000uF at +/-50v
regards Andrew T.
  Reply With Quote
Old 16th November 2004, 05:49 AM   #5
diyAudio Member
destroyer X's Avatar
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default I founded that when you have less than 5000uF for each ampere...

The bass turns strange.

Calculate the peak amperes and multiply by 5.000uf , this is some day by day result, not a calculated value.

Also i could feel, someday, that putting parallell diodes in the bridge rectifier unit, the bass also "seems" to be more strong.... but those things do not make any sense to me...only made sense to my ears long time ago.


  Reply With Quote


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
What about multiple small speakers? gruni Subwoofers 24 24th March 2009 08:31 PM
Replacing multi-section caps with multiple caps? Sir Trefor Tubes / Valves 1 29th May 2007 11:17 PM

New To Site? Need Help?

All times are GMT. The time now is 10:08 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2