B&O icepower 500A modules: need output LC?

packman · 7th November 2008, 07:59 AM

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

theAnonymous1 · 7th November 2008, 12:30 PM

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

packman · 7th November 2008, 12:48 PM

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

bwaslo · 7th November 2008, 04:52 PM

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).

packman · 8th November 2008, 03:33 AM

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?

bwaslo · 8th November 2008, 03:48 AM

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.

packman · 8th November 2008, 04:00 AM

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.

7th November 2008, 07:59 AM	#1
packman diyAudio Member Join Date: Sep 2005	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

7th November 2008, 12:30 PM	#2
theAnonymous1 diyAudio Member 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 __________________ "If you don't like funerals don't kick sand in Ninja's face." - Ninja

7th November 2008, 12:48 PM	#3
packman diyAudio Member Join Date: Sep 2005	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

8th November 2008, 03:33 AM	#5
packman diyAudio Member Join Date: Sep 2005	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?

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7th November 2008, 04:52 PM	#4
bwaslo diyAudio Member Join Date: May 2006	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).

8th November 2008, 03:48 AM	#6
bwaslo diyAudio Member Join Date: May 2006	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.

8th November 2008, 04:00 AM	#7
packman 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.

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