Ewar Woowar wrote:
"Wally" wrote
It occurs to me that, since an isobaric sub has two drivers, then
there are two options for connection, series and parallel, which
results in two options for impedance - 4 and 16 ohms.
More like 4ish(f)+/-jX(f) or 16ish(f)+/-jX(f) ohms.

Yes, 4 or 16 nominally, for the purpose of drawing a basic comparison.



In the interest of giving the amplifier the best chance of
maintaining tight control of the drivers, is one impedance
preferable to the other? For example, what would happen if I put a
16 ohm speaker on an amp that expected 8 ohms?

4ish+/-jX ohms may blow your amp or at least demand high current from
it. 16ish+/-jX ohms will have lower damping as each driver is driven
from 8ish+/-jX ohms.
Best option would be a separate power amp for each driver. Make sure
out of phase.
Second best option is in parallel but note comment above.

In other words, the best option is the one where the impedance if of the
drivers and amp are matched? If so, what about using an amp that wants 4 or
16 - could there be any differences, in terms of driver control, between
them?


The amplifier will likely be solid state, 50-100W per channel, maybe
with a low-pass filter at the input (because that seems like a good
place to put it - all of the amp's work is going into the wanted
frequencies).

Yes, this will reduce IMD too.

Cool. That sounds like a good thing to have.


--
Wally
www.art-gallery.myby.co.uk
On webcam: Black Cat In Coal Cellar