On Dec 26, 12:00*pm, tony sayer wrote:
In article , Bob Latham bob@sick-
of-spam.invalid scribeth thus



In article ,
* Jim Lesurf wrote:
In article , Eeyore
wrote:

On the ESL63 the resulting LF roll-off is -6dB at about 35 Hz, roughly
second order IIRC. This, of course, is the nominal 'free space' value.
In the room I use for the main hifi system the last time I measured it
was only about -3dB at 30-35Hz. The result does not sound 'bass light'
to me. But this will of course depend on the room, etc, and the absence
of a box boom may make other speakers seem to have 'more bass'... *:-)

It may be more significant that the sound pressure level you can get at
low frequencies is perhaps more restricted than a good conventional
speaker of similar price. But that is a question of sound power, not
frequency response.

In an attempt to improve both the LF extension and spl stacking is
sometimes used and I can see that that would be fine with the 57 variety.
What about your 63s? Presumably you would have to arrange them such that
they form part of an outer circle otherwise their concentric rings and
imaginary point source behind the speakers will be rendered useless?

Cheers,

Bob.

Unless you must have it louder there wouldn't be any point and as said
the point source will be sodded up....
--
Tony Sayer

It depends what you're doing whether "the point source will be sodded
up". For instance, Bessel is a form of stacking in which the point
source, far from being "sodded up" is enhanced. For another, several
of the stacking schemes for ESL63 and similar (for which it becomes
even less necessary, but I'm just humouring Poopie because it is
Christmas) I explained are for very grand or even public rooms, in
which a tiny loss in potential quality will not be noticed because no
one will sit down to listen for it, and the overwhelming quality of
the stats *will* be noticed. For yet another, it is easy to stack the
ESL63 and derivatives in pairs so that the point source of one
precisely meets the point of origin of the other, which is only
notionally possible, and only at one listening point, for any other
type of speakers (especially multiple cones!), the upshot being that
ESL-63 is probably the most stackable speaker there is...

Andre Jute
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