B&O icepower 500A modules: need output LC? - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

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 7th November 2008, 08:59 AM   #1
packman is offline packman  Italy
diyAudio Member
 
Join Date: Sep 2005
Post B&O icepower 500A modules: need output LC?

I have an implementation with 2 of these modules and there is a LC filter outboard, is this filter an extra or the icepower needs that filters because don't have them onboard?
Thanks
  Reply With Quote
Old 7th November 2008, 01:30 PM   #2
diyAudio Member
 
theAnonymous1's Avatar
 
Join Date: Feb 2004
Location: Anonymityville
There is a 2nd order filter and zobel network on the module. Are you sure the outboard filter is connected to the outputs and not some kind of power filter?

http://www.icepower.bang-olufsen.com...er500adata.pdf
  Reply With Quote
Old 7th November 2008, 01:48 PM   #3
packman is offline packman  Italy
diyAudio Member
 
Join Date: Sep 2005
Default yes

Yes theA i'm sure.
it's not simple to see the scheme but it's a small circuit from the output of the 2 icepower to the speakers connections.
It has some caps and 2 toroidal L
  Reply With Quote
Old 7th November 2008, 05:52 PM   #4
bwaslo is offline bwaslo  United States
diyAudio Member
 
bwaslo's Avatar
 
Join Date: May 2006
Location: Portland, Oregon!
It must be some kind of extra filter to remove switching frequencies or RF noise. Probably not a good idea for the audio performance, though, since that filter would be outside the feedback loop (having feedback that included the filter was supposed to be a big advantage of ICEpower, though not as thorough as the UcD design in that respect).
  Reply With Quote
Old 8th November 2008, 04:33 AM   #5
packman is offline packman  Italy
diyAudio Member
 
Join Date: Sep 2005
Post highs rolloff

that's interesting bwaslo, the sound is excellent and fluid but i hear a rolloff of the high frequencies so want to try to reduce that effect bypassing the lowpass filters around the icepower (but without any risks of damage the modules).
The load isn't very easy to drive (B&W 801 Matrix II), can i try to connect them directly to the icepowers?
  Reply With Quote
Old 8th November 2008, 04:48 AM   #6
bwaslo is offline bwaslo  United States
diyAudio Member
 
bwaslo's Avatar
 
Join Date: May 2006
Location: Portland, Oregon!
I don't see why not. Provided the original filters are still within the ICEpower modules.

Of course, they aren't my speakers that would be getting hooked up...you have to estimate the risk yourself. Maybe connect to some cheap speakers first, to make sure before connecting the B&Ws.

What is the amplifier? Is it a commercial amp assembly with that filter added, or something cobbled by a DIYer?

If a commercial amp, it might be something they had to add to meet FCC or CE radio non-interference requirements.
  Reply With Quote
Old 8th November 2008, 05:00 AM   #7
packman is offline packman  Italy
diyAudio Member
 
Join Date: Sep 2005
Hi, it's a commercial amp.
I think the FCC or CE requirements can be the real reasons of that filters, like you said.
Sure i always tried modded amps with cheap car speakers first
The B&W have a bypass in the protection circuits so need attention.
  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
Pair B&O ICEpower 500A MK II modules acrosounder Swap Meet 1 25th March 2009 07:49 PM
FS: 5 ICE Power 500A Mk2 modules Mickeman Swap Meet 5 2nd March 2009 04:51 PM
ICEPower 500ASP and 500A modules for sale Jack Hidley Swap Meet 0 15th February 2009 01:47 AM
icepower 500a input imp., a doubt... packman Class D 2 8th December 2008 07:38 AM
For sale: ICEpower 500A Modules Stanray Swap Meet 4 14th January 2005 04:33 PM


New To Site? Need Help?

All times are GMT. The time now is 09:26 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