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


"Don Pearce" <donald@xxxxxxxxxxxxx> wrote in message
news:43df6388.19699593@xxxxxxxxxxxxxxxxxxxxxxx
> 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

Humm I never really consider why
I alays just thought it took less power to push the lighter diaphram
and the lighter you can make the diaphram the faster it can mover and
respond to changes
along with needing to be small to generate the hf sound
intresting question I will be following the anwsers offer by the great men
of audio science
George


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