Replace 2241 with 2242 or 2268 -- Can I ???

[though]

ok, this is the deal. i have 4 SR4719A dual 18 cabinets that are loaded with 2241H drivers from the factory as well as 2 newer SRX728S dual 18 cabinets loaded with 2268H from the factory.

i have, over the years, had to recone several of the 2241's and quite simply am tired of shelling out the money to do so. i just don't think they are a very durable driver with my application. i have yet to recone a 2268. i have read that the 2242/2268 is a much more durable driver.

my question is, can i replace the 2241H's in the SR cabinets with 2242H or 2268H without anything going wacko?

musical content is rock, classic rock, rap/hip-hop.

thanks!

[grumpy]

My understanding is that the 2268 is a viable (and perhaps preferred?) replacement for the 2241 and would not require cabinet retuning. I almost had one to test, but it was damaged
in shipping and had to be returned. :banghead:

I think you'll find this second-hand info backed up by previous posts here (and Tech Info
material), but I'd be all too happy to be corrected if I'm wrong.

-grumpy

[though]

so you're saying that if i were to replace the 2241's, do so with the 2268 and NOT 2242?

[grumpy]

I'm suggesting you check it out a bit further or wait for someone with specific experience to chime in. Tuning might change with a 2242. -grumpy

http://audioheritage.csdco.com/vbulletin/showthread.php?t=11346

[though]

i'll need someone to translate that for me :D

[grumpy]

might get boomy or lack bass if the holes in the box aren't the right size to match the driver.

Maybe someone here has the time to look up your cabinet volumes and model the frequency
responses w/ 2241/2242/2268. I'll check after work if no one else responds...

says right in the Tech Info that 2268H is an alternate for 2241H but with a neodymium magnet. (and a boatload lighter) :D -grumpy

[though]

thanks grumpy!



might get boomy or lack bass if the holes in the box aren't the right size to match the driver.

Maybe someone here has the time to look up your cabinet volumes and model the frequency
responses w/ 2241/2242/2268. I'll check after work if no one else responds...

says right in the Tech Info that 2268H is an alternate for 2241H but with a neodymium magnet. (and a boatload lighter) :D -grumpy

[grumpy]

ok, who needs lunch anyway ... :)

red=2242H
yellow=2241H
green=2268H

spl.jpg assumes 600W input.
tf.jpg attached for frequency response comparison (simpler to see than on SPL plot)

hope this helps. -grumpy

(assumed 15ft3 and 3, 4"diax6" ports for an example comparison to approximate the SR cab)

[though]

please explain the results to the average dummy :p

[though]

could you change the input wattage variable to 1500w. thanks.

[grumpy]

for 1500W vs 600W, add ~4db across the board in the SPL plot. But realize at 1500W,
some of the drivers will run out of steam at certain frequencies.

If you believe what's shown, with no eq, the 2242's might sound like they have less bass
(but my understanding is they're tough...and can take a bit of EQ punishment to
compensate)

2241's distort sooner and eventually blow with less power (bigger dip in yellow curve
at ~50Hz) than either of the other drivers... at least the way that I modeled this with
the info available to me... and as long as you use a subsonic filter (remove stuff
below ~20Hz). The kind of music you describe would hit the 50Hz area pretty hard.

All said, your mileage may vary. Heck... sounds like you have lots of drivers and cabs:
swap two 2268's into a 2241 cab, if you like what you hear, and they don't blow up,
just flush all of this modeling stuff and move on :D

BTW, it looks like SRX728S cabs are also roughly the same volume & I'll hazard a
guess that tuning (port size/length) is similar even though the ports are rectangular
vs round (should be a straight driver swap). -grumpy

("OK... break's over!")

[though]

you are correct. i'll just pop a couple of the 2268's out of my srx box and put them in a 4719A cab for a while and see what they're all about in it.

i really appreciate you researching this for me.

- troy

[though]

just called JBL and they stated that the SRX728S box was designed to keep the 2268 cooled. the 4719A cab is not nearly as deep as the 728S, therefore the driver is likely to overheat.

sounds like it probably won't work out afterall :(

[grumpy]

Certainly good to know... Good you checked with the pros. "My bad" (and apologies) for not
pointing you there first.

Air flow/coupling on the frame structure/heat sink was something lost in the numbers.
I guess there's a good reason for the rectangular ports being on top (chimney) in the
2268H-based box.

-grumpy

[though]

ya, he said those drivers can run extremely hot. if they are not in a enclosure that provides proper cooling, they are toast. not worth the risk for me. i am better off just getting new cabs.

thanks a million though :D

[Motus]

First, I am glad to join this forum and this is my first post. I have discovered JBL pro back in 1976 in Paris at the Festival du Son. I enjoyed a demonstration with a pair of 4343 and 76cm/s analog tape that just floored me! I have been lucky that high quality sound was always part of my life since my father was a electronic engineer in France. I had Siare and Audax, Davis (kevlar) drivers and grew up listening to a Princeps 35cm!
As a teenager I swore to myself I would one day enjoy a JBL Pro system. Now just a tad older, hum, hum, here is my 4 way system:

Per channel
2242, driven by Bryston 7Bsst 600W up to 90 Hz, 10ft3, Fb: 30 Hz
2226, driven by Bryston 7Bsst 600W up to 800 Hz
2446+2382, driven by Bryston 2Bsst 150W up to 6.8 KHz
2404 driven by Bryston 2Bsst 150W
Rane AC 23 configured in 4 way XO: 24dB/octave Linkwist Riley
Pre amp: Bryston BP 25 with power MPS 2
Sources: Linn Unidisk 1.1 and Linn LP 12, akito, adikt
Listening room is 10x4.5x2.4 m

I just replaced a pair of 2241 by the 2242, here are my observations:

1) The 2241 was a very capable "boomer", delivering deep basses, slightly rounded. Frequency transition with the 2226 was 80 Hz.
2) The 2242 delivers dry, clean, deep basses. Frequency transition is now 90 Hz and the level needed to be adjusted up slightly, perhaps 2 dB. Because of its more powerful magnet (an increase of 9% in the moving mass is compensated by over 23% more powerful motor), the upper bass register is clean. On orchestral music the transparency achieved and physicality of space and instruments is incredible. This is something that would have muddyed this register with the 2241, although the level did not need adjustment. Now the dynamics is phenomenal in every register: when compared side by side, touching the suspension while playing the same bass line, one can immediatly feel the impetuous, responsive nature of the 2242 versus a somewhat less tempestuous 2241: A Bentley versus a Rolls.

As far as I am concerned, multiamplification with active crossover like the Rane is the most versatile way to set up a complex system with great components. The difficulty is that it always sounds good but really the work and the reward is when it sounds exceptional. I want also to point out that the 2226 is an exceptional upper bass/low midrange option. Notice the Qts, Qms and Qes of the 2242 are closer to those of the 2226 than the 2241s.

Hope this helps someone and add to the discussion. I enjoyed reading posts by Giskard on the subject and agree that the 2242 is quite a remarkable transducer.

Ciao.