2242hpl / 2245h subwoofer

[Valveglow]

Hello and thanks much in advance.

I have read what I could find, both here and elsewhere, about the JBL 2242HPL and 2245H Woofers. Recently, I was compelled to buy a couple of each, and now I would like to have a subwoofer utilized featuring two 18" JBL woofers. I have read that the 2245H goes a bit lower in frequency, is somewhat less efficient, and has considerable but somewhat less power handling ability than it's 2242HPL cousin. I have read about the surrounds and their durability, and also that the 2245H requires a larger cabinet.

My dilemma is multi faceted: I have a smaller space than ideal for the subwoofer box, I am not certain where I can find information regarding cabinet volume, porting, etc., and ultimately I will need to find someone who can fabricate a proper enclosure for me. So while I believe I am off to a great start, I am MILES away from the finish line, looking for and deeply appreciating any and all advice, experience, and recommendations that Forum members can offer.

Presently, I have an acoustic suspension enclosure housing two 18" automotive subwoofers (which sound much better than one would expect). Crossed over with a rather steep slope at 50 Hz at the moment, their effect, while potentially profound, is not at all intrusive into the upper bass / lower midrange. It is powered by an inexpensive but ample Crown XTI 4000 amplifier.

Again, my sincere thanks to all who can point this bewildered enthusiast in the right direction.

[JeffW]

I can never find the page, but Rusty has linked to the 2245 plan section here. Nothing on the 2242, but something to read until maybe somebody else comes along.

http://www.audioheritage.org/vbulletin/showthread.php?34206-JBL-Subwoofer&p=345541&viewfull=1#post345541

[Valveglow]

I can never find the page, but Rusty has linked to the 2245 plan section here. Nothing on the 2242, but something to read until maybe somebody else comes along.

http://www.audioheritage.org/vbulletin/showthread.php?34206-JBL-Subwoofer&p=345541&viewfull=1#post345541


Thank you very much!!!

[audiomagnate]

Do you have a fireplace?

[Valveglow]

Yes, actually, I do. I laughed when I first saw that photo. My wife isn't thrilled with the looks of my 4435s, let alone THAT arrangement...

[grumpy]

Might have a look at this if you lean toward the 2242:
http://www.jblsynthesis.com/tl_files/catalog//jblsynthesis/S1S-EX/S1S-EX%20Spec%20sheet.pdf

[Lee in Montreal]

Hey Valveglow. The 2245 and the newer 2242 are two completely different 18" drivers for two different purposes.

The 2245 is high fidelity subwoofer. Great for home use. With Fs-20Hz

The 2242 is for sound reinforcement. High power but Fs-35Hz

Pick your poison ;-)

[Valveglow]

Hey Valveglow. The 2245 and the newer 2242 are two completely different 18" drivers for two different purposes.

The 2245 is high fidelity subwoofer. Great for home use. With Fs-20Hz

The 2242 is for sound reinforcement. High power but Fs-35Hz

Pick your poison ;-)


Thanks Lee. That is about the ONLY thing I know about them. Due to space limitations, I may not be able to utilize the 2245s. Any idea where I could find diagrams, plans, etc to house either one? I'm flying blind here...

[ivica]

Thanks Lee. That is about the ONLY thing I know about them. Due to space limitations, I may not be able to utilize the 2245s. Any idea where I could find diagrams, plans, etc to house either one? I'm flying blind here...

Hi,

I think that our member "grumpy" has shown the possible solution for 2242 in the
http://www.audioheritage.org/vbulletin/showthread.php?39781-2242hpl-2245h-subwoofer&p=406096&viewfull=1#post406096

if talking about 2245, then 10 cft would be the best solution, and for the smaller box You can use GT solution...

regards
ivica

[gasfan]

I'm seriously thinking about building 6ft. isobaric boxes for 2245s. Simple cone to cone with form tubes as chambers. You'd never know to look at them.

[Valveglow]

Might have a look at this if you lean toward the 2242:
http://www.jblsynthesis.com/tl_files/catalog//jblsynthesis/S1S-EX/S1S-EX%20Spec%20sheet.pdf


Hi,

I think that our member "grumpy" has shown the possible solution for 2242 in the
http://www.audioheritage.org/vbulletin/showthread.php?39781-2242hpl-2245h-subwoofer&p=406096&viewfull=1#post406096

if talking about 2245, then 10 cft would be the best solution, and for the smaller box You can use GT solution...

regards
ivica


Thanks Gents! It's a good start, except that the cabinet cannot exceed 18 inches in depth. I do not know if adding to height or width to make up volume would hurt the design. Incidentally, what is the "GT" solution??

[Lee in Montreal]

Incidentally, what is the "GT" solution??

Probably the W15GTi... Requires a small box but a big amp. And you get deep and "violent" deep bass ;-)
4 to 5 cft will do.

BTW More reading from this forum on this same topic.
http://www.audioheritage.org/vbulletin/showthread.php?22814-Subwoofer-for-hi-fi-2242H-vs-2245H


http://demandware.edgesuite.net/sits_pod20/dw/image/v2/AAUJ_PRD/on/demandware.static/-/Sites-masterCatalog_Harman/default/dw7f43eaa9/W15GTi%20mkII_005_3000x3000_300dpi_dvHAMaster.jpg? sw=672&sh=672&sm=fit&sfrm=png

[grumpy]

I expect GT=Greg Timbers ... see old 2245 sub article with electronic assistance.

Also, you can go shallower... as in the 4645 theater box, but might have to resort to curved port tubes.

[Valveglow]

Probably the W15GTi... Requires a small box but a big amp. And you get deep and "violent" deep bass ;-)
4 to 5 cft will do.

BTW More reading from this forum on this same topic.
http://www.audioheritage.org/vbulletin/showthread.php?22814-Subwoofer-for-hi-fi-2242H-vs-2245H


http://demandware.edgesuite.net/sits_pod20/dw/image/v2/AAUJ_PRD/on/demandware.static/-/Sites-masterCatalog_Harman/default/dw7f43eaa9/W15GTi%20mkII_005_3000x3000_300dpi_dvHAMaster.jpg? sw=672&sh=672&sm=fit&sfrm=png


I expect GT=Greg Timbers ... see old 2245 sub article with electronic assistance.

Also, you can go shallower... as in the 4645 theater box, but might have to resort to curved port tubes.


Thank you both again! Yes, both Greg Timbers and this particular woofer both seem to address the "GT" solution! I already have my woofers, both the 42HPLs and the 45Hs, so it's going to eventually be a couple of those... As stated, I do need to go shallower, but as far as curved ports are concerned, I am already "challenged" (read: LOST) by all of this... Thank you again, most sincerely

[Lee in Montreal]

If you are limited to 18" deep, it is not a problem as long as you keep the same volume. Just increase height or width to compensate for the reduction in depth. As for the ducts' length, they could be straight and positioned horizontally or vertically.

[Valveglow]

If you are limited to 18" deep, it is not a problem as long as you keep the same volume. Just increase height or width to compensate for the reduction in depth. As for the ducts' length, they could be straight and positioned horizontally or vertically.


Very good to know Lee. Thanks much.

[Lee in Montreal]

BTW Grumpy's mention of the JBL Synthesis is interesting too. It will require some processing, but nothing out of the extraordinary (6 to 8db bass boost). The cabinet's internal volume is 7.4cft (with the ducting. The three round ducts can be replaced by a square vent that could be part of the cabinet's bracing as long as it respects the length and area.

http://www.jblsynthesis.com/tl_files/catalog//jblsynthesis/S1S-EX/S1S-EX%20Spec%20sheet.pdf

if you are limited to 18" depth (outside measurement), that cabinet could be horizontal (or vertical if you prefer). Around 36" wide x 24" tall x 18" deep external measurements = 7,4cft internal volume including ducts.

Square vents can be per Onken style where vents act as bracing too.

http://www.studiomsoft.com/audio/images/onken/onkenfig2small.gif

http://www.hometheatershack.com/forums/attachments/diy-speakers/16058d1253752226-altec-416-8a-box-requirements-photo-onken.jpg

[edgewound]

BTW Grumpy's mention of the JBL Synthesis is interesting too. It will require some processing, but nothing out of the extraordinary (6 to 8db bass boost). The cabinet's internal volume is 7.4cft (with the ducting. The three round ducts can be replaced by a square vent that could be part of the cabinet's bracing as long as it respects the length and area.

http://www.jblsynthesis.com/tl_files/catalog//jblsynthesis/S1S-EX/S1S-EX%20Spec%20sheet.pdf

if you are limited to 18" depth (outside measurement), that cabinet could be horizontal (or vertical if you prefer). Around 36" wide x 24" tall x 18" deep external measurements = 7,4cft internal volume including ducts.

Square vents can be per Onken style where vents act as bracing too.

http://www.studiomsoft.com/audio/images/onken/onkenfig2small.gif

http://www.hometheatershack.com/forums/attachments/diy-speakers/16058d1253752226-altec-416-8a-box-requirements-photo-onken.jpg


Onken cabinets are pretty awesome. The rectangular vents allow retuning by stuffing closed cell upholstery foam into them to seal them off, which is, obviously, reversable. Makes it nice to be able to tailor the bass response to your driver/room for more or less impact.

And...with void free baltic birch plywood, they're built like a tank.

[Valveglow]

BTW Grumpy's mention of the JBL Synthesis is interesting too. It will require some processing, but nothing out of the extraordinary (6 to 8db bass boost). The cabinet's internal volume is 7.4cft (with the ducting. The three round ducts can be replaced by a square vent that could be part of the cabinet's bracing as long as it respects the length and area.

http://www.jblsynthesis.com/tl_files/catalog//jblsynthesis/S1S-EX/S1S-EX%20Spec%20sheet.pdf

if you are limited to 18" depth (outside measurement), that cabinet could be horizontal (or vertical if you prefer). Around 36" wide x 24" tall x 18" deep external measurements = 7,4cft internal volume including ducts.

Square vents can be per Onken style where vents act as bracing too.

http://www.studiomsoft.com/audio/images/onken/onkenfig2small.gif

http://www.hometheatershack.com/forums/attachments/diy-speakers/16058d1253752226-altec-416-8a-box-requirements-photo-onken.jpg

[QUOTE=edgewound;406235]Onken cabinets are pretty awesome. The rectangular vents allow retuning by stuffing closed cell upholstery foam into them to seal them off, which is, obviously, reversable. Makes it nice to be able to tailor the bass response to your driver/room for more or less impact.

And...with void free baltic birch plywood, they're built like a tank.[/QUOTE

Lee, edgewound & grumpy, this information is nothing short of incredible!! Incidentally, are we speaking 2242 HPL or 2245H for these boxes? Although, it looks as though it is for a smaller woofer. How I wish I actually KNEW something about this!!! Thank you, thank you, thank you!!

[Lee in Montreal]

[QUOTE=edgewound;406235]Onken cabinets are pretty awesome. The rectangular vents allow retuning by stuffing closed cell upholstery foam into them to seal them off, which is, obviously, reversable. Makes it nice to be able to tailor the bass response to your driver/room for more or less impact.

And...with void free baltic birch plywood, they're built like a tank.[/QUOTE

Lee, edgewound & grumpy, this information is nothing short of incredible!! Incidentally, are we speaking 2242 HPL or 2245H for these boxes? Although, it looks as though it is for a smaller woofer. How I wish I actually KNEW something about this!!! Thank you, thank you, thank you!!

You can use it with both drivers. And you can fine tune accordingly by blocking vents as Edgewound suggested. The 2245 in a 8cft cabinet (per exemple) may not reach as low as in a 12cft box, but you will get more "real life bass" with more kick. Many will even tell you that under 25-28Hz, there's usually not much content... You could tune the cab to 25Hz, and lower that frequency by blocking some vents if needed.
Basically, build one set, and test both 2242 and 2245 drivers. And yes, this photo shows a cab for a 15" driver. Just make the hole bigger for your 18" unit.

These cabs are pretty easy to draw up and fabricate. Simply add a single vertical brace that ties the top and bottom with the front and rear panel with a notch for the woofer. Very easy to do.

[Valveglow]

[QUOTE=Valveglow;406282]

You can use it with both drivers. And you can fine tune accordingly by blocking vents as Edgewound suggested. The 2245 in a 8cft cabinet (per exemple) may not reach as low as in a 12cft box, but you will get more "real life bass" with more kick. Many will even tell you that under 25-28Hz, there's usually not much content... You could tune the cab to 25Hz, and lower that frequency by blocking some vents if needed.
Basically, build one set, and test both 2242 and 2245 drivers. And yes, this photo shows a cab for a 15" driver. Just make the hole bigger for your 18" unit.

These cabs are pretty easy to draw up and fabricate. Simply add a single vertical brace that ties the top and bottom with the front and rear panel with a notch for the woofer. Very easy to do.


HA!!! Easy for YOU, perhaps! Remember, you are currently dealing with the virtually clueless and entirely devoid of talent!! Thanks Lee, very much in fact!