From: Don Cox <[log in to unmask]>
>>> Electrostatic speakers have no enclosure. They are not infinite baffle
>>> unless installed in a will.
>>> Infiniet baffle is a technical term that means none of the sound from
>>> the back comes to a listener in the front.
On 08/02/2013, Lou Judson wrote:
>> Strictly speaking, yes. However, a large baffle can be very near to
>> infinite in practice. Frequencies down to about 80 Hz can be controlled,
>> and below that, in most living rooms there are so many complications from
>> room effects that it is hard to say what is happening to the sound.
>> For example, in my teen years I put speakers in the walls of the
>> living room that had the attic behind them. Infinite baffle. No front
>> vents. <L>
I used to describe it in class by pretending to mount a driver on the
classroom door. If the door was open there would be cancellation of the
front and back waves. Close the door and we hear only the front -- and
annoy everyone in the hall. Now, if the door is not sealed at the
bottom, the slot is the bass reflex opening. If you want a round hole,
remove the door lock. In an old building if there was a transom above
the door, we could tune the opening. Now if we open a window and the
classroom next door have their door and windows open, that could be a
labyrinth reflex opening (Bose???)
I sometimes used a closet to explain acoustic suspension speakers since
we could "seal" a closet. Then I dragged in a horn tweeter from an
Altec A-7 and blew their minds telling them that this huge heavy
cast-iron monster was a tweeter. Then came the explanation of the horn,
and the horn/labyrinth reflex woofer mounting of the A-7.
> Strictly speaking, unless your attic was infinite in volume, this is
> another "large baffle".
I also discussed mounting the driver on a window, then the great
outdoors was a real infinite baffle!
> And can one speaker act as a passive cone for
> the other (if the big drum is all in one channel, for instance) ?
> Don Cox [log in to unmask]
In my case I was in mono! But in discussing multi-driver systems I
explained that the backs of the other drivers had to be sealed or in a
separate box so that they are not affected by the rear compressions of
Mike Biel [log in to unmask]