My little 2235h project

[Lee in Montreal]

I don't know if this is the right section to post this little project of mine that ended this weekend. Basically, since I was 16 (I am now 48), I have always designed enclosures that had little footprint to the eye (I like them slender, short but deep - no nasty comment here). Meaning even a big volume enclosure had to be pleasing and not massive (yeah, honestly, I have always fiercely hated JBL's big boxes). Another fetish I had for the past 3 decades that I only applied on this enclosure is the "forward cabin". I have no idea from where it comes. Maybe something I have seen in the 1960s or 70s, but no clear memory of it.

So, here it is. A pair of 15" subs using JBL's 2235h. The enclosure is 16" wide, 29-1/2" tall with the casters, and 30-1/2" deep (it could be 50" deep, you wouldn't see it from the front. Volume is 4.5cft and the port is tuned to 30Hz.

The front extension is fully detachable (soft mounted with a foam gasket all around), while the main body is made from highly braced 1" MDF and curved laminated layers of 1/4" Massonite sheets. With tangerine orange stained birch venner. The interior is lined with 1.5" thick medium density grey foam. That thing weights 95lbs without the driver.

Better picture coming later.

49357

[Krunchy]

Funky!
Kinda reminds me of the Wharfedale Evo designs, you certainly did a nice job on them as far as workmanship. :applaud:
Would have never thought that massonite would make a good enclosure material but then again!!!?

Most impotantly...how do you like them? What else are you using with this set up?

[Lee in Montreal]

It was not the regular light massonite, but a product much denser. The first layer was glued and nailed, and the consecutive layers were only glued.

From my preamp (NAD 1300 or Technics SU-9070) the signal goes into an active crossover (Behringer CX3400) then into a selection of 200-240wpc power amps for the bass - ADCOM 5500, several Yamaha P2200-PC2002, the mids are fed thru a Technics SE-9060 and the highs thru a Rotel. Each bass section has its own EQ (Technics parametric, and Behringer digital). I run a set of 4530s with 2225h crossover at 120Hz, and these subs crossed at 60HZ, just to add that physical presence.

I also alternate my tweeters between 2402, 2404 and 2405. Basically, th system is in constant evolution. Otherwise how fun would it be?

[Krunchy]

Sounds like a very nice set up Lee, post some pictures when you get a chance, folks around here really like that, myself included :).

[martin_wu99]

I don't know if this is the right section to post this little project of mine that ended this weekend. Basically, since I was 16 (I am now 48), I have always designed enclosures that had little footprint to the eye (I like them slender, short but deep - no nasty comment here). Meaning even a big volume enclosure had to be pleasing and not massive (yeah, honestly, I have always fiercely hated JBL's big boxes). Another fetish I had for the past 3 decades that I only applied on this enclosure is the "forward cabin". I have no idea from where it comes. Maybe something I have seen in the 1960s or 70s, but no clear memory of it.

So, here it is. A pair of 15" subs using JBL's 2235h. The enclosure is 16" wide, 29-1/2" tall with the casters, and 30-1/2" deep (it could be 50" deep, you wouldn't see it from the front. Volume is 4.5cft and the port is tuned to 30Hz.

The front extension is fully detachable (soft mounted with a foam gasket all around), while the main body is made from highly braced 1" MDF and curved laminated layers of 1/4" Massonite sheets. With tangerine orange stained birch venner. The interior is lined with 1.5" thick medium density grey foam. That thing weights 95lbs without the driver.

Better picture coming later.

49357
So beautiful!
Do you want to sale them? I'm very interesting:D

[Lee in Montreal]

It started like that

49362

49363

49364

49365

49366

[Eaulive]

I wish I could work wood like that :crying:

[Lee in Montreal]

All the sections were cut by CNC. I submitted CAD drawings and they cut all sections 100% identical to each others. Then everything else is just assembly and a bit of creativity. ;)

[hjames]

From the image it looks like a black cabinet inside an orange housing - is it a folded horn design of some kind, or am I just not seeing it correctly? It looks great!


I don't know if this is the right section to post this little project of mine that ended this weekend.

The front extension is fully detachable (soft mounted with a foam gasket all around), while the main body is made from highly braced 1" MDF and curved laminated layers of 1/4" Massonite sheets. With tangerine orange stained birch venner. The interior is lined with 1.5" thick medium density grey foam. That thing weights 95lbs without the driver.

Better picture coming later.

49357

[hjames]

From the image it looks like a black cabinet inside an orange housing - is it a folded horn design of some kind, or am I just not seeing it correctly? It looks great!


I don't know if this is the right section to post this little project of mine that ended this weekend.

The front extension is fully detachable (soft mounted with a foam gasket all around), while the main body is made from highly braced 1" MDF and curved laminated layers of 1/4" Massonite sheets. With tangerine orange stained birch venner. The interior is lined with 1.5" thick medium density grey foam. That thing weights 95lbs without the driver.

Better picture coming later.

http://www.audioheritage.org/vbulletin/attachment.php?attachmentid=49357&d=1294784983

[grumpy]

I believe the orange panel under the 'black box' is solid, flat, vertical, and closed.

I can almost see that one could visualize an opening there, but I think it is shadow
and misdirection.

[Lee in Montreal]

From the image it looks like a black cabinet inside an orange housing - is it a folded horn design of some kind, or am I just not seeing it correctly? It looks great!

It's a simple bass reflex. The black section is only an extension. Currently working on a tapped horn to use with a 1500 GTi driver.

But hey, I have a set of folded horns. They are 4530s. Will post pictures of the installation soon with the rack of P2200/PC2002s ;-)

Here's the red cabinet when it as intended for a 12" Kef B300B.

49367

Previously used in this configuration

49368

In a design evolution of its late 1970s predecessor. The famous Kef 105/2.

49369

[4313B]

All the sections were cut by CNC. I submitted CAD drawings and they cut all sections 100% identical to each others. Then everything else is just assembly and a bit of creativity. ;)Sounds like Don should have done that with his Project May!

Nice job! :yes:

[Lee in Montreal]

Yesterday, I tested the new 2235-based sub with my pair of 4530 w/ 2225h.
Up to a certain comfortable level, the 2235 follows. But as soon as the volume starts climbing, the 2235 easily meets its excursion limit. I cut the lower end at 25Hz and it helps, the 2235 is a fine studio or living room driver, but certainly not to be used at higher sound levels.

So, this morning, I fitted a 2225h into the other empty enclosure. Playing a 2235 and a 2225 side by side in similar enclosure. The 2225 sure can offer higher SPL, but it remains a PA driver. Not much bottom end but a massive dose of 80Hz-120Hz if not equalized. But hey, it was a simple experiment that helped me understand what each driver was good for. The 2225h in a 4530 is so pleasurable with that powerfull and tight kick that can play so loud. A very efficient enclosure for that driver.

2225h on the left. 2235h othe right.

49404
49405

Now, still looking for a 2245h, or perhaps even a 2241h for that thumping bass. ;-)

[polar_bear_0104]

hi lee,

awesome work! now i know who to turn to for cabinet work if i'll ever need one...:applaud:

good thing you're in montreal, easy to reach as far as i'm concerned....

keep the pics and experiments coming!

cheers

[Eaulive]

The 2225h in a 4530 is so pleasurable with that powerfull and tight kick that can play so loud. A very efficient enclosure for that driver.

49410

;-)

49410

That's JBL porn :applaud:

[Lee in Montreal]

As delicious as the 2235h bass is, it is also obvious that it can't take too much spl before hitting Xmech. This weekend, I removed the 2225 drivers from their 4530 enclosure and tested the following combo: the 2225 in the newly built enclosure (4.5cft) and the 2235 in the 7.5cft center sub. The 2225 have lost a major part of their dynamic which is attributed to the 4530 scoop. But still nice as a bass reflex. It sounds... "homie". Yup. Round and reassuring, but it definitely lost its edge. An acoustic bass doesn't have the same feel as in the 4530. Say goodbye to dynamic...

Therefore, seeing that I wanted to put the 2225 back into their original 4530 enclosure, I decided to purchase a pair of monster sub drivers. Automotive JBL W15GTi. 800W RMS-92db and 5000W peaks (whatever it means)... I guess that these subs will be able to follow the 4530/2225 combo and offer enough bottom to operate like Batman and Robin or Bill and Monica.

Here's what a W15GTi driver looks like with its double coil and cooling vanes.

49448

[Robh3606]

As delicious as the 2235h bass is, it is also obvious that it can't take too much spl before hitting Xmech.

What kind of SPL levels are you listening at??

Rob:)

[4313B]

What kind of SPL levels are you listening at??

Rob:)He isn't the first to make such comments.

The 2235H can generate SPL's in a typical room that result in permanent hearing damage after a mere 15 minutes.

[Lee in Montreal]

What kind of SPL levels are you listening at??

Rob:)

Well, I like the kind of bass you don't hear but feel. Therefore hears are left out of the equation ;-) I am also a bass freak. :eek:

[hjames]

The 2235H can generate SPL's in a typical room that result in permanent hearing damage after a mere 15 minutes.

If you don't have a Sound pressure Level meter, go right off to Radio Shack and get one from them ... its something like $50 - and certainly, your ears are worth that much!

[MikeBrewster77]

If you don't have a Sound pressure Level meter, go right off to Radio Shack and get one from them ... its something like $50 - and certainly, your ears are worth that much!

"Sound" advice! :p

As I recently mentioned in another thread, I apparently have no adequate frame of reference for SPL. Now that I've taken a few measurements at what were formerly "typical" listening levels, I'm a bit more judicious with the volume knob. I'd like to be able to continue to enjoy this hobby, and I figure I kinda need my hearing to do so.

[4313B]

Well, I like the kind of bass you don't hear but feel. Therefore hears are left out of the equation ;-) I am also a bass freak. :eek:The W15GTi should pressurize your house quite nicely then.

[Val]

I love your use of color!

[Lee in Montreal]

The W15GTi should pressurize your house quite nicely then.

:D Indeed.