There are many car audio woofers with low Fs, high Qts and large Xmax ratings that would seem to be tailor made to EQ at the bottom. And given their 4 ohm impedance, they’d be simple to wire in series for an 8 ohm load.

Bad idea?

My OB's work well in the corners, so they don't take up a lot of room space.

Dave

• My Site

Charlie

Dave :^)

Take a look at Linkwitz site if you havnt already. Wayne and I talked about a dipole bass box for a while but never got it off the ground. The basic idea, and exagerated for this discussion. You can use two 25 dollar woofers and have high efficiency and very low distorion as you would expect from a 300 dollar woofer. Linkwitz has some dimensions and instructions for a few of these last I saw.

Bill

Love your VOTT's too

• http://www.linkwitzlab.com/index.htm

I've given his Orion a cursory look in the past. Truthfully, I was trying to stimulate some conversation among people who "don't have a dog in the fight". Also, for a dummy like me picking out the bottom-line from SL’s expositions is more than a bit difficult (I guess I lack sufficient will).

What sort of arrangements did you and Wayne discuss?

Charlie

The Di pole design cuts back on second harmonic distortion primarily. I'm not an expert in these regards so for the hard dry facts you need to work with the pocket protecters! As always theres no free lunch, meaning your not going to get 30hz, 100db and 1 cubic foot all in the same speaker. Like I said the biggest advantage here is to get very low distortion using 'lesser' quality drivers that would cost a fraction of a single 'good' driver. It also seems possible to have a little more bottom end from this arrangment too.

The best bang for the buck drivers that came to mind would be an Eminance Delta12LF. There are some Pioneer drivers I have used in 10" that are in th 20 -30 range. These would also be great drivers.

The feelings I got from poking around would be to slot load the drivers. With the two driver facing each other and a slot for an opening. This could be just a simple bottom section to a cabinet with a mid and horn built into the top. Like your jbl driver on the VOT. You can even corner load the slot for room boundry gains.

Olsen did some work with two driver in a few different arrangements. This is similar to Isobaric, but perhaps not in the true sense. Again, more of an engineers reference in needed here. This sure isnt anything new. Actually, it's all been done before! Just another version as we move on. I dont have any thing on paper that you can build from. If memory serves There are drawings and dimensions around at a few places and the dimensions can be changed for the spec on the drivers your using.

Bill

The dipole configuration has a lot of advantages, directivity being one of its biggest. But I wasn't planning to use this arrangement. I was considering the use of a push-pull driver configuration in a π cornerhorn. It would use a ported motor chamber and not a dipole.

Just thought I'd clarify.

I know one has to buy Car audio generally-i notice many kicker brand subs have super high Qts

the dayton 15" IB woofer comes to mind, 109$ on special lastweek i saw......

i like high SPL though,like 115db at listening position,so IB doesnt appeal to me at the moment.but if i have my horn subs for high output,i would like to try this dipole idea

Smaller box too!
:-)