[fdandrews]

Anybody remember the Celestion 6000 dipole woofer system? It had (2) 12 inch woofers mounted on small baffles and facing each other several inches apart. It also had EQ for the woofers. It was designed for use with a small sealed box speaker system. I'm wondering if there are any advantages or disadvantages to this arrangement. I seem to remember that Celestion claimed that mounting the woofers facing each other gave the higher sensitivity of 4 woofers in a smaller package than stacking them or putting them side by side. Anyone tried this configuration? 

[sfdoddsy]

I used to own a set of 6000s. They sound nice, but didn't play very loud.

I have been considering something similar with the woofers flipped around so they can act as the base and support for an OB.

Here's is Mr Linkwitz's take on them.

http://www.linkwitzlab.com/models.htm#B1

[fdandrews]

Excellent link! Thanks.

[AJinFLA]

I used to own a set of 6000s. They sound nice, but didn't play very loud.

http://www.linkwitzlab.com/models.htm#B1

Yep, Compound Dipole.
From what I recall, it was the Sats that were woefully inefficient and the limiting factor, not so much the subs.
Very cool concept at the time.

cheers,

AJ

[sfdoddsy]

The subs were pretty limited in volume. I used mine with a pair of Marton Logan CLS as well and it was all too easy to bottom them.

[AJinFLA]

The subs were pretty limited in volume. I used mine with a pair of Marton Logan CLS as well and it was all too easy to bottom them.

Hi Steve,

I was referring to when used with the 600 Sats (low 80s sens IIRC). Yes, the price to pay for that ultra-compact coolness...would be output.

[ScottTheSculptor]

I've had a system 6000 since the mid 80's.
Original drivers were hi q drivers similiar to the Celestion ones for guitar amps - but with a cast baskets.
They had barely enough output to match the 89db/w of the SL6&600s. Quite stiff to keep from running wild.
20 years in my drivers started failing one by one - Celestion quit making the replacement coils in the late 90's.
Because of that you can find the crossover without the old blown subs.

I found the linkwitzlab dipole page listed above and figured the best new replacement driver to be automobile subs.
Stiff enough to maintain composure in a leaky trunk :-)
I picked Image Dynamics dual coil subs.
They are actually about .5 inch too deep so I built extenders for the outside hemispherical dust covers.

They are satisfactory. 30 years and a market to drive the tech makes for substantial improvement in subs.
The old drivers maxed out behind a Bryston 4B-NRB (maybe why they blew ;-) ).
The new drivers are much more efficient and swallow everything the Bryston will send. Could use a second NRB to bridge both into mono.

Boxless subs don't have muddy delay from system resonances, "crisp" low bass
top end is original SL6 behind a Naim NAP250 bolt together - the celestion crossover takes a load off and lightens the old girl up.

Please excuse the zombie post, figured the info would be better here than in a new post.

[Toaster]

Just for the sake of information, sensitivity of the SL6 was measured at 82.5dB in a contemporary review in the old digest-size Hi-fi Choice magazine.

[ScottTheSculptor]

Even less efficient than I thought.

gnnett,
Image Dynamics Idq12d4 (12 inch, dual 4 ohm) can't remember which version 2 or 3 - they're currently in storage.

strange forum message interface wouldn't let me reply directly.