RE: Whole House Audio

["Phil Harris" <phillip.harris1@xxxxxxx>]

I certainly wasn't advocating the use of a Genesis to drive whole house
audio ... for that I'd probably use a couple of the 6 channel Rotel power
amps at about £350 each (IIRC).

I'd personally rather put the Genesis amps back into a decent car where
they
deserve to be!

Phil

> -----Original Message-----
> From: Keith Doxey [mailto:ukha@xxxxxxx]
> Sent: 20 June 2001 20:28
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Whole House Audio
>
>
> 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.
>
> 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.
>
> 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 :-))
>
> Keith
>
> > -----Original Message-----
> > From: Phil Harris [mailto:phillip.harris1@xxxxxxx]
> > Sent: 20 June 2001 20:06
> > To: ukha_d@xxxxxxx
> > Subject: RE: [ukha_d] Whole House Audio
> >
> >
> >
> > Genesis are not mass market amps ... their ratings are very
> conservative -
> > much like Mission or Naim but in the car audio world. I'd happily
pit a
> > Genesis in car amp against most of the semi-decent home amps on
> the market
> > and they'd do well.
> >
> > Unfortunately running an amp from 12v is pretty inefficient ...
> I used to
> > have an Orion 2100HCCA that we tested once at 1,280w RMS bridged
> > into a 2ohm
> > load without clipping and at that it was drawing slightly less
> > that 220Amps
> > at 13.8v.
> >
> > Phil
> >
> > > -----Original Message-----
> > > From: Keith Doxey [mailto:ukha@xxxxxxx]
> > > Sent: 20 June 2001 19:21
> > > To: ukha_d@xxxxxxx
> > > Subject: RE: [ukha_d] Whole House Audio
> > >
> > >
> > > Where does the other 150W go?
> > >
> > > 50% efficiency is absolutely terrible !
> > >
> > > Be aware that car amplifiers seldom quote the RMS rating and
they
> > > never qute
> > > the distortion figures at the output they claim. The true
power
> > > rating at an
> > > acceptable distortion level is often very low.
> > >
> > > Keith
> > >
> > > > -----Original Message-----
> > > > From: James Hoye [mailto:james.hoye@xxxxxxx]
> > > > Sent: 20 June 2001 16:51
> > > > To: ukha_d@xxxxxxx
> > > > Subject: RE: [ukha_d] Whole House Audio
> > > >
> > > >
> > > > This email was delivered to you by The Free Internet,
> > > > a Business Online Group company. http://www.thefreeinternet.net
> > > >
---------------------------------------------------------------
> > > > > If it's just background type music and not ear
splitting
> > > volumes that's
> > > > > needed then you can get in-car amplifiers quite
cheaply.
> > > >
> > > > I still have a Genesis SM60 car amplifier which offers
2
> > channels of 30w
> > > > each.  Also got an SM100 which offers (you guessed it)
50w
> > per channel.
> > > >
> > > > In reality, they were conservatively rated, and the
SM60 would
> > > > output nearer
> > > > 45w per channel and the SM100 nearer 75w (4 ohm loads).
> > > >
> > > > Bridge the channels (2 ohm), and the things would drive
crazy
> > > loads.  Only
> > > > problem is that for say 150w RMS you need at least a
300w
> > > supply.  300w @
> > > > 12v = 25A.
> > > >
> > > > Lent the SM100 to my brother-in-law to drive his
15" (or
> might be 18")
> > > > homemade sub in briged mode - provided he could build a
power
> > > supply meaty
> > > > enough!!!
> > > >
> > > > James H
> > > >
> > > >
> > > >
> > > >
> > > > ____________________________________
> > > > Automated Home UK
> > > > http://www.automatedhome.co.uk
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> > >
> > >
> >
> >
> >
> >
> > ____________________________________
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> > http://www.automatedhome.co.uk
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>
>
>
>
>
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> http://www.automatedhome.co.uk
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____________________________________
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http://www.automatedhome.co.uk
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