Re: CVS commit - JAMin 0.97.08

On Sun, Jul 01, 2007 at 09:30:33AM +0200, Udo van den Heuvel wrote:
> Jan Depner wrote:
> > On Sat, 2007-06-30 at 23:16 -0700, R Parker wrote:
> [....]
> >     That's very interesting but not the reason I wanted to add the
> > delays.  Here's a quote from BBE's site that explains what the delays
> > are meant to correct:
> [...]
> [cut]
> 
> Are the default delays a good starting point for this 'effect'?
> When experimenting with a recording (made outside) in my small room I
> did not get the different parts (high, mid, low) in sync.

Compensating for delays like this is specific to each individual
speaker system. You'd have to test the impulse response of your speakers
and adjust accordingly. If manufacturers provided impulse plots it would
save a lot of work (but if people realised how bad the impulse responses
of most speakers are they wouldn't buy them ;-)).

Actually this per-band compensation isn't a complete solution. 
It only compensates for differences in the distance from the
speaker drive units to the listener (eg. the centre of a bass driver
is usually further back in the cabinet than the centre of the HF
driver). It can't do anything for group delays, which occur where
there is a slope in the amplitude/frequency response, eg. the LF roll-off
of a bass driver. The steeper the roll-off (and the greater the phase shift)
the greater the group delay.

John

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