Re: Power rating on LF/HF units. Rv!

On Tue, 31 Jan 2006 13:10:38 -0000, "Rv!"
<not.a.valid@xxxxxxxxxxxxxxxxxxxxx> wrote:

>Hi all,
>Can anyone help me with a query that's been going round my head
>for ages?
>
>When you look at a PA speaker cabinet you generally find (say) the
>12" driver would be rated at around (say) 300w and the matching
>HF horn unit would be rated at (say) 50w.
>
>What's the relationship for these figures? I know it is likely to be complicated
>but there must be some general rule that can describe why the HF driver is
>always rated much lower then the LF unit.
>
>I would appreciate any ideas as to why this is the case including any possible
>links to technical matter on the subject.
>
>Thanks all,
>
>Robertv!
>
>

I've recently looked at a dozen or so modern music files in Audition,
applying low and highpass scientific filters (3rd order Butterworth)
at 2kHz, to see what power would go to a woofer and tweeter
respectively.

Interestingly, the peak level is identical for both - meaning that the
woofer and tweeter amps would need the same power rating (they
actually produce volts - the power is merely a consequence). Average
power levels, though are a different matter, being about 6dB greater
for the woofer and the tweeter. That would mean that a 50W tweeter
would merit a 200W woofer for a balanced system.

d

Pearce Consulting
http://www.pearce.uk.com
.

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