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Old 27th April 2002, 05:04 PM   #11
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The bass, which is not shown on the photos is very hungry.
Are my speakers impressive ? Everything still under construction.
On top is my plasma.
The thing in the middle is a modified Infinity EMIM.
On the bottom is a very usual 6" speaker.
Click the image to open in full size.
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Old 27th April 2002, 08:13 PM   #12
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In case that you reduce iddle current that much, you will obtain an increase of distortion. High iddle current reduces distortion for the class A amplifier.
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Old 27th April 2002, 08:39 PM   #13
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Regarding speakers, I'd say they mach amplifier.
However, with quad-amped system I'd rather go for monoblocks to avoid long cables to the speakers. But of course it all depends what you have available. Check that link: http://passdiy.com/gallery/aleph5-p1.htm
It's Aleph 5 with adjustable bias. You can also e-mail owner and ask about differences with the different settings.
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Old 27th April 2002, 10:39 PM   #14
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Default Nice pictures, now those 450/60 transistors

Here is the specifications for the 450 http://ec.irf.com/ec/adirect/ir?quer...lse&cmd=search

The minimum on-resistance is quite high. This in itself is not a big problem if you are using lots of them. However, this is a high voltage unit. To get desired switching characteristics, input capacitance suffers -- exacerbated by using many.

I would advise against using this unit, and I would expect the 460 to be a complete non-starter (second number usually indicates "generation" where newer is usually worse for audio). Besides, the cost of devices is low compared with total package (heatsinks, power, cabinet, connectors).

Petter
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Old 27th April 2002, 10:56 PM   #15
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I think that I am over-heatsinking my aleph2. Would increasing the bias current make it sound better? How much higher can I increase it on the Aleph 2?

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Old 27th April 2002, 11:10 PM   #16
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If you search the Forums, you should find a post that I did explaining the relationship between Aleph power and speaker impedance. This results in minimum required quiescent current and PSU voltage for a given power level at a certain impedance.

It is all pretty basic.

Petter
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Old 27th April 2002, 11:13 PM   #17
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ok, so no 450/460.

Also my heatsinks are for TO3.

Any advice where to get suitable TO3 mosfets in Germany/Europe ?


If there is more distortion on low bias, no problem, as long as it is not getting too bad.

As background music it will be ok, and for seriously listening, I can pump up the idle ...

The Aleph5 with 6 different bias levels from the link ( isnt it a A3 ? ) is interesting...

This results in minimum required quiescent current and PSU voltage for a given power level at a certain impedance.

Yes, and so, for room level, I like to reduce the idle current.


Bernhard
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Old 27th April 2002, 11:57 PM   #18
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Brian,
Nothing wrong with running your amp little cooler. When you'll build your amp you can play with different bias values and see how it affects sonics.
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Old 28th April 2002, 12:02 AM   #19
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HPotter,

Thanks for your response. I was just worried that it would not run hot enough to sound good. I will play with it once I get it finished. I have my cases almost done for both channels.

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