True Subbass

[Dr.db]

Hi,


I know I just had my 2235h thread on, but I`m wondering If I might be more happy with a monosubwoofer.
Considering that, I`d have ~250liters of netto Volume for one Subwoofer.

This sub shell play from ~100 down to the bottom end.
I would believe the 2235h is still the best choice, but what do you guys think??
Does it even make any sense to put the 2235h in 250liters? Or does a 150liter enclosure allready plays as low as this speaker is able to?

What about a 2240h 18" sub. Would this perform any better in low frequencies than the 2235h? Or is 250liters not enough?



Beside that, which modell for up to 250liters would you suggest?


(not for PA-use, just home-hifi and home-theater )




Thanks a lot and have a nice week,
Olaf

[clmrt]

Do you have WinISD or BoxPlot?

Yellow = 250L tuned to 25Hz.

If you download WinISD, you can see the performance charachteristics for any virtual box you like.

[Flaesh]

http://www.dougronald.com/images/PB010011.JPG

[jcrobso]

http://www.dougronald.com/images/PB010011.JPG

Could you provide some info?

[Eaulive]

Could you provide some info?

It's the crazy guy with 6 30" Electrovoice and 1/3rd of his basement as a cabinet

http://www.dougronald.com/

[Ruediger]

Hi Dr.db,

You could build a B6 alignment. That is a 6th order system, where the bass cabinet is still a 4th order system, and some external electronics provide an additional 2nd order filter.

It requires ca. 140 liters with the 2235 (I think) and it will go down to 22 Hz (I think).

You should make the port big, and that will require additional length. So the overall volume consumed will be more than 140 liters.

There are several electronic crossovers which can provide the 2nd order filter. The one I know is EV DX38.

Regards Ruediger

[Mr. Widget]

Dr.dB... how big is your room, how loud do you want to play and how low?

The 2235H is an excellent all around woofer but it was never really designed to be a sub. It will work in smaller rooms and in cases where you only need bass to around 30Hz. Alignments and enclosures will affect this to some degree, but the design of the woofer simply does not afford it the xmax necessary to pressurize a larger space at VLF.

I wouldn't use the 2240 but you might consider the 2245 if you don't need to fill a very large room with VLF.


Widget

[jcrobso]

Many years ago that 30" was all the rage. The problem was that EV never put a big enough VC and magnet to really control the cone.
I heard a demo many years ago of the 30" EV with an accelerometer on the speaker cone, this would provide real time feedback to the amp and the amp would make corrections to the signal. This made a closed loop servo system, it did sound impressive, but required a rack full of gear to do the job at the time.
I believe that Velodyne uses this type of system.

[4313B]

you might consider the 2245 if you don't need to fill a very large room with VLF.

Is an IMAX theater too big?

[BMWCCA]

Originally Posted by Mr. Widget
you might consider the 2245 if you don't need to fill a very large room with VLF.

Is an IMAX theater too big?

[toddalin]

When an 18" just isn't enough? No affiliation.

http://losangeles.craigslist.org/wst...492332462.html

[Mr. Widget]

Is an IMAX theater too big?

Now you know that was an irresponsible post... the IMAX theaters used piles of 2245s and blew them up at an alarming rate... JBL responded by developing the 2242.

Even so, a 2245 in a 250 liter cab will not do infrasonics as well as most modern dedicated sub woofer designs.


Widget

[4313B]

Now you know that was an irresponsible post...

Yeah, but it didn't cost anything while I'll bet all those blown 2245H's did. Someone spec'd them.

Even so, a 2245 in a 250 liter cab will not do infrasonics as well as most modern dedicated sub woofer designs.

Neither will a 2242H.

[Mr. Widget]

Neither will a 2242H.

Hell no... I am not really a fan of it either, but it sure can hurt you before it blows up.

...and while I wouldn't spec the 2245 for a theater, IMAX or otherwise, I do find it a wonderful sounding woofer. 4345 anyone?


Widget

[timc]

I guess the 2269 would do it if you need to fill a very large room with VLF.

Anyone auditioned it yet?


-Tim