RE: Whole House Audio

["James Hoye" <james.hoye@xxxxxxx>]

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> Therefore it follows that they probably cost more than a
> reasonable quality
> Domestic HiFi amp which would be eminently more suited to Whole
> House Audio.

The SM100 was 300 quid, and the SM60 200 when I bought them back in err..
1994/5 I would guess.

> Running a Car Amp via a mains powered supply is grossly
> inefficient anyway.
> The amp itself will not run on 12V internally otherwise to
> realise an output
> of 150W the load would have to be less than about 0.5ohms.
>
> Typically a 150W amp requires a 50-0-50 power supply, or to put in
another
> way +50V, 0V, -50V. That means the amp has an internal switch mode
power
> supply to increase the voltage.
>
> For a mains powered 150W amplifier, a 50-0-50 supply only needs 4
parts.
>
> 1	Heavy Toroidal Transformer 35-0-35 @ > 150VA
> 2	Bridge Rectifier 35A @ 150 PIV
> 3 & 4 Electrolytic Capacitors >10000uF @ 63V
>
> Simple, Reliable, Loads of oomph in reserve.
>
> I have a homebuilt amp rated at 4x150W into 4 ohms or 4x112W into 8
ohms.
> The Power supply is a 500VA transformer with 22000uF capacitors.

Don't you just love it when Keith talks 'dirty'...

> At normal domestic listening levels you can unplug it from the mains
and
> plug it into another socket without losing sound as long as you take
less
> than 15 seconds. I like a good power supply. If its over
> engineered it lasts
> forever :-))

But isn't it supposed to fail just outside the warranty period (or extended
warranty period if you were duped by the CurComDix sales droid..)?

James (cynical) H - just about to buy himself a Fujifilm MX6800 from
Amazon.co.uk




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