[Mark Korda]

Dear Frank,back in the 80's I bought a passive sub unit from BW called the(Acoustitune).I remember the listener had to adjust the port size manually.It was small and I think used a 8 inch woofer.I never really got mine to work right.Were those a joke,or do you still beleive in them.Mine is long gone,but did you ever have any luck with them or it?I almost forgot all about that little sub....thanks Mark Korda.

[jmc207]

I believe it used (2) 6.5" woofers, though it is a fairly large box. I also tried one for a few years. Worked okay in my smaller room, not so good in my larger system. I still have it in storage; maybe I'll bring it out and try it with the office system. The following picture is not of mine but one I found for sale somewhere out there:

[Lefty052347]

I bought a used Acoustitune 10-12 years ago.  I currently use it with my concept 90 cm1's.  Before that I used it with my dm1600's.

It came with 4 tuning cylinders to stuff in the port.  These are used to match the efficiency of the main speakers used with it. 80-83 db/83-85db/85-88db/88-90db.

The cabinet encloses dual 10" drivers.  It passes the full signal to the main speakers while using a low pass filter to drive the 10" woofers.

I still find the Acoustitune very musical

Regards,
Dean

[plaf26]

Sorry I didn't spot this thread sooner.  According to the brochure, the Acoustitune uses "two 160mm (6in) acoustically coupled bass with composite short fibre cone."  They are mounted face-to-face and driven out of phase.  One is bass reflex coupled and the other is in a Helmholz resonator.  I used mine for a number of years with B&W 560's.  Now it's part of my HT set up in the basement screening room.  I use the shortest tuning tube because it's louder that way for the explosions and all.   The rest of the set up is in my listing in the "Systems" tab above.

[trebejo]

Does the cylinder fly out of the port when the explosion is big enough? Audiovisual for the masses!

[avahifi]

Nope, the removeable port has a twist lock scheme to keep into place.  Of course the direcitons missed the port needed for most bass possible, which is no port at all.

It would be really fun to try an Acoustitune with our new Fet Valve 600R amplifier.

By the way, we will be in Chicago Sunday afternoon for a presentation of our new equipment to the Chicago Audio Society.  It is in Arlington Heights.  Refer to the club's web page for details.

Jim Salk is bringing a set of his amazing Soundscape 12 speakers for the session.  It should be interesting.

Frank Van Alstine

[gjs_cds]

The concept actually kinda makes sense to me, acoustically.  Tune the frequency of the sub relative to sub placement as well as room size, shape, and acoustics.  (As well as to taste, and music genre.)

Interesting concept for someone who is trying to short-change acoustical physics to get "better sound".  Kind of like using your "loudness" or "SRS WOW" feature in car audio.

No thanks.  If it can't be done properly, then just don't do it at all.