9.0 cubic feet tuned to 30 Hz

[spkrman57]

I like the JBL 2226 in a reflex cab, single coil to tame rising response(2226H=.7 mh) and a 1" compression driver(Altec 802/902/806 or JBL 2426) on 650hz round wooden tractix horn(Edgarhorn that is). Using 3rd order crossover with HF compensation sounds very nice in my room(smallish at 12' x 16' w/8 ft ceilings).

When I run with 45 SET amp, I keep the coil on the 2226, and run a 4 ufd oil cap for the HF horn. The setup is a little bit hot, but for low level listening in a small room has great soundstage for classical and I can hear great detail.

I ran a powered sub with the last setup some time back and it tamed some of the HF hot sizzle.

Ron

[Guido]

Speaking of that, here's an SPL graph of a project I just finished. Regards,
Gordon.

Please post pics Gordon!

[aust-ted]

Hi

I am currently using 15 cu ft cabs with dual 2235Hs installed and tuned to Fs (20 Hz) and am happy with the outcome though they do take up some space. What attracted me was the extra efficiency of dual drivers, the lower distortion which I was advised I would get both by tuning to Fs, and by using dual speakers. I mainly listen to classical music and it often benefits from low freq extension.

Can anyone provide an insight into what would be the difference between a large box with one 2245 compared to a pair of 2235s? That is assuming each was properly tuned.

I never seriously looked at the 2245s because EBS alignments appeared huge and I needed to construct boxes with limited vertical height so I could place decent size mid horns on top and preserve my listening position.

Regards
Ted

[4313B]

15 cu ft tuned to 20 Hz

Red is dual 2235H's and green is single 2245H

[4313B]

Incidentally, BB6P wants 13.25 cu ft tuned to 22 Hz for dual 2235H's and 14.26 cu ft tuned to ~ 21 Hz for their version of extended bass.

[Zilch]

An old rule-of-thumb says it takes two 15's to do what a single 18 will do.

In most respects, apparently, with equivalent drivers, that ain't far off....

[spkrman57]

The dual 2235's perform close to the 2245. Looks like a good way to go.
Ron

[aust-ted]

Giskard

Thanks very much for modelling the dual 2235s v 2245. Most appreciated.

As Zilch says, it is amazing how accurate some of these rules of thumb are.

Thing that interested me most is that the dual 2235s appear to require less cone displacement.

Regards
Ted

[Tom Loizeaux]

Though I'm just looking to learn about the 2245H compared to the 2242H, I must say that your responses to questions is invaluable! Your graphs really tell the story. Without them we'd be lost in opinions.
Again, I thank you for your contributions to the Forum!

Tom

[Earl K]

Again, I thank you for your contributions to the Forum!

Here ! Here ! or is that? Hear ! Hear !

Anyways : Ditto

[boputnam]

Here ! Here ! or is that? Hear ! Hear !

Bingo.

[spkrman57]

I appreciate all the technical help.
Ron

[Alex Lancaster]

"Thing that interested me most is that the dual 2235s appear to require less cone displacement".

xmax of 2235 = 8.38, power 150 W.
xmax of 2245 = 9.65, power 300 W.

So they end up moving about the same air; I suspect the xmach mechanical of the 2245 is even more, proportionally.

[4313B]

Vd for the dual 2235H's is 1514 cu cm while Vd for the single 2245H is 1230 cu cm.

I thank you for your contributions to the Forum!

Anyways : Ditto

Bingo.

I appreciate all the technical help.

Thanks.

[jtgyn]

G'Day All,
A very interesting thread.

Thanks Giskard for sharing your technical insight, great stuff!

Regards Scott