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Old 22nd July 2008, 11:43 PM   #11
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Hmm, I'm not quite sure what you mean.... internal shielding??

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Quote:
Originally posted by otto88
Thanks TNT

The shielded closed box, is it just a metal box, with no internal shielding?
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Old 23rd July 2008, 02:41 AM   #12
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By internal shielding I mean some sort of flexible shielding material, wrapped around the amp (Ive heard of a couple of types, but cant think of their names right now).

It sounds like you just used a box: steel or aluminium?

So the whole thing was not difficult . .
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Old 23rd July 2008, 05:53 AM   #13
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Quote:
Originally posted by theAnonymous1
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?

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Stone-age class-D amplifiers rely on a dummy RC load to achieve output filter damping and stability with high negative feedback. As a result, they suffer from a shortage in high frequency power that depends on the size of the dummy resistor.

Particularly, ICEpower is a design full of compromises due to the size. The damper resistors employed are not very big.

However, there are a few newer designs, like self-oscillating ones (UcD and derivatives), that achieve output filter damping and low THD in other ways resulting in no power shortages at all.
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Old 23rd July 2008, 05:59 AM   #14
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OK - no internal stuff, just an empty alu box. The machanical challenge was the biggest I would say. Electrically is just mains, input and speakers - easy really.
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Old 23rd July 2008, 06:10 AM   #15
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TNT

Some good news, thank you . .

Eva,
Have I understood correctly that it's an issue where running maximum power. But I wonder how close to maximum power it needs to be, to start to hear the rolloff?
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Old 23rd July 2008, 06:16 AM   #16
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As I understand it, you never experiance a "roll off" as in experianced reduced level of high freq. energy but rather, the amp shut down really. Something that never happend me despite of neighbour war levels.

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Old 23rd July 2008, 06:38 AM   #17
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The graph you posted and the one I referred to p9 of the datasheet both show a rolloff . .
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Old 23rd July 2008, 09:17 AM   #18
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The graph shows long term - this is not music - but, yes it does.

How often do you play 10khz 30watt ?
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Old 23rd July 2008, 09:25 AM   #19
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In my case the icepower amp sounded like when you disconnect the tweeters in your speakers.

I tried the icepower amp fullrange only once, but made it into subwoofer amp for the rest of its lifetime till i blew it up.
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Old 23rd July 2008, 09:31 AM   #20
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This is what happens when you loose all IM and other dist ;-)

/J

Quote:
Originally posted by Tekko
In my case the icepower amp sounded like when you disconnect the tweeters in your speakers.

I tried the icepower amp fullrange only once, but made it into subwoofer amp for the rest of its lifetime till i blew it up.
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