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-   -   B&O ICEpower modules – any built? (http://www.diyaudio.com/forums/class-d/126752-b-o-icepower-modules-any-built.html)

otto88 22nd July 2008 04:22 AM

B&O ICEpower modules – any built?
 
Hi

Doing a search, I see that a couple of batches of ICEpower modules have been sold here by YFW including 1000ASP/500ASP

Also several have sold individual modules . .

Has anyone completed an amp – any problems? – how is the sound?

Thank you

Tekko 22nd July 2008 10:04 AM

I´ve used them, and was pretty disappointed, power bandwidth is so crappy, after about 1KHz, they roll off. Their only good for bass boost applications.

TNT 22nd July 2008 10:47 AM

I use ASP1000 full range and don't agree with Tekkos judgment. On swedish forums these amps has been bashed by some of the "gurus" and the desiphles keep shanting their wisdom.

They sound great. regarding the power bandwith, yes, they do not put out 1000w at 22 khz but if you knew anything about spectral division of music this is only of academic interests. I think these amps has some very attractive characteristscs and I enjoy them every day on a high quality system. They are revealing so any crap (ok, dirt then :) ) up or downstream is revelad. Nuff said!


otto88 22nd July 2008 01:29 PM

Did either of you find any problems in completing them, eg noise, availability of connections?

Tekko

> after about 1 KHz, they roll off

That sounds like something went wrong . .


TNT,

Could you give a summary of your successful implementation?

Thanks

theAnonymous1 22nd July 2008 01:36 PM

I was looking at the power BW graph in the datasheet and it made me wonder how other class-d amps such as Hypex UcD and Tripath compare in this regard. Do only switching amplifiers exhibit this type of power roll-off?

http://i34.tinypic.com/14iq5ib.jpg

otto88 22nd July 2008 01:57 PM

Response over 30 kHz or 50 kHz
 
There’s another graph in there http://www.icepower.bang-olufsen.com/en/downloads/ (sorry don’t know how to post it):

Typical Performance Characteristics - Frequency Response on page 9.
It shows response at 20 kHz is about – 0.2 db, but as frequency rises above 30 kHz (for 4 ohm loads) or 50 kHz (for 8 ohms), response starts to fall relatively rapidly.
By 100 kHz: the 4 ohm is about – 6 dB, the 8 ohm is about – 4 dB.

I think a falling response "higher up" isn't unusual, but this fall is more than most. Its audibility would be debated . .

theAnonymous1 22nd July 2008 02:07 PM

That is just the typical frequency roll-off associated with the output filter which should remain constant throughout the amps power range.

The power bandwidth roll-off mentioned above is something entirely different.

(Excuse me if I sound like I know what I'm saying; I really don't) :o

TNT 22nd July 2008 05:26 PM

I just put mine in a very tigth shielded and closed box.
Put a ferrite (inside the box) on the power connection wires. Whery thgth fit.
Good quality XLR connectors and there you go!
Power is on the back - no switch for on/off.
Thats it.

http://hem.bredband.net/filmett/1ice.jpg
http://hem.bredband.net/filmett/1ice2.jpg



Quote:

Originally posted by otto88
Did either of you find any problems in completing them, eg noise, availability of connections?

Tekko

> after about 1 KHz, they roll off

That sounds like something went wrong . .


TNT,

Could you give a summary of your successful implementation?

Thanks


TNT 22nd July 2008 05:45 PM

This is from the spec:

"Long-term high frequency protection
The output filter of the amplifier is not capable of handling large long-term high frequency signals due to the
output Zobel-network (see Figure 22). The protection circuit decreases the threshold of the soft clipping circuit to
limit the input signal in case of overload. Thereby damage of the Zobel-network (or the high frequency drive
unit) will not occur under laboratory test or any other condition that is not music (e.g. microphone feedback).
The module has been tested at extreme levels with the most demanding music without triggering the high
frequency protection circuit."

I have never been able to trigger the protection and I have been playing loud, I assure you.

otto88 22nd July 2008 11:41 PM

Thanks TNT

The shielded closed box, is it just a metal box, with no internal shielding?


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