Re: Tannoy Reveal and LM3886 power amp IC

On Wed, 26 Mar 2008 17:18:07 +0000, Eeyore
<rabbitsfriendsandrelations@xxxxxxxxxxx> wrote:



Don Pearce wrote:

Eeyore wrote:
Don Pearce wrote:

Although they are small, tweeters need just as much power as bass
drivers on average music material.

You mean they have the same sensitivity ?

The average power they receive (which varies according to the crossover
frequency) is invariably less than the woofer though.

No, I mean the peak voltage they get from signals (which is a measure
of how powerful an amp needs to be) is about the same as that of the
bass speaker. I've looked at several dozen pieces of varied music, and
although for many of them peak bass level was higher, for several the
peak treble was the bigger.

I think you're saying much the same thing effectively but expressing it
differently.


If you are talking average power, of course, they are much lower. But
power amps aren't impressed by averages when it comes to servicing the
peaks.

I assumed a 2kHz crossover.

There's surprisingly little info around on how the energy in music signals
'divides' with frequency band. My ancient EV Sentry IVs data *** included
the first example I've ever seen of an analysis of this.

Graham

With Adobe Audition, the scientific filters let you swap easily
between highpass and lowpass at the same frequency, simulating a
typical crossover. Doing that it is easy to see how the peak levels
turn out.

Just had a quick look at "The walk of life" by Dire Straits. The bass
peaked at -0.4dBFS, and the treble at -0.6dBFSS.


d

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