RE: Whole House Audio

["Keith Doxey" <ukha@xxxxxxx>]

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,
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> ---------------------------------------------------------------
> > 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
>
>
>
>
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