DIY 1200 Array

[4313B]

Something I've been working on for years in various iterations. Someday I might even finish them.

The intent here was to build as small and efficient an Array as possible that could give a Tannoy DC12i a run for the money. It clocks in around 96 dB, W, m. The smaller size of the Tannoy DC12i (basically the same volume as a JBL 120Ti) is still quite tantalizing, as is the superior imaging. But, alas, it isn't a JBL. Nor can it upgrade from a three-inch high frequency compression driver to run a state of the art four-inch high frequency compression driver if desired (quite frankly, I find the 435Be to be quite sufficient here). To be fair, the Tannoy isn't really at the same price point.

Greg's 1200 Array remains my all time favorite JBL system; custom or otherwise.

[hlaari]

Interesting work
how dues 2206h sound with 476be and 045be?

[maxwedge]

2206 is a great 12", ported or sealed. I use it in a 4way with 2245, 2206, 2445 (w/Be) and 2405. One day I may be fortunate to afford better top end drivers.
Cool project 4313B

[Robh3606]

They look really nice! How are you doing the crossovers?? You doing active or do you have passives running. How do you like that driver combo on the horn?? The 476 barley fits in the box.

Rob

[4313B]

how dues 2206h sound with 476be and 045be?

How are you doing the crossovers?? You doing active or do you have passives running. How do you like that driver combo on the horn?? The 476 barley fits in the box.

Using the 476Be here is kind of like driving a wire brad into a stick of butter with a twelve pound sledge hammer. But I made sure the box would accommodate the larger four inch drivers anyway. I'm undecided whether to use a 243x or 245x.

Hopefully this weekend I can get some measurements with a 435Be and 476Be so I can LEAP some networks.

I'm tempted to use a flat cut white birch veneer instead of the planned espresso.

[spkrman57]

Are you planning to run the 2206 sealed/ported/open back?

I have a pair of 2206J's that I have been playing around with but found no real love like I do for the 2226's I use as my mainstay.

I ran my 2206's in a L-100 cab I had sitting empty but stuffed the port with foam and left the tweeter mounting hole open for approx 60 hz tuning per WT2. I estimated approx 15hz less bottom end than the 2226. I don't want subs in my system and that killed 2206 ideas for me. You do need a sub with them up to 80hz!

I'll be watch this thread progress!

Regards, Ron

[4313B]

Interesting work
how dues 2206h sound with 476be and 045be?

Well... it has none of that "slap you in the face a few times, and then once more for good measure" that untamed 2123, 2202, or E120 have...

I think Doug Button did a great job on it.

[JuniorJBL]

Those are great 4313b!!

Looking forward to your listening impressions!

[4313B]

Do you have all of yours done (except the one I have)?

[maxwedge]

Sorry, I didn't mean to insult you if I did.
I think your work is impeccable and it's wonderful that you share it.

I just blurted out that line about the grill because of the sub I just got but should have phrased it a little differently. I get lazy some times.

[JuniorJBL]

Do you have all of yours done (except the one I have)?

You're funny!!

Of course not, me finish a project...........Hahaha


I told myself that I needed to finish spraying my 250's and button them up, first, then I can build some more speakers.

I will get there soon though!

[1audiohack]

Thanks.

I am also keenly interested in this thread.

I like the look of the horn in the box.

[4313B]

No cheating here using the stock 1400 Array network.

The 2206H length at 7.8 ms and all three curves are 1/6th octave.

Someone wanted to know just how bad the 435BE and 045BE drivers would react to the stock 1400 Array network intended for use with the 435AL and 045TI.

Second graph is with the polarity reversed on the 045BE.

[4313B]

No cheating here using the stock 1400 Array network.

Someone wanted to know just how bad the 435BE and 045BE drivers would react to the stock 1400 Array network intended for use with the 435AL and 045TI.

What happens if you disconnect the 045 like G.T. ended up doing in his 1200 Arrays?

I unhooked it in LEAP and here is the result. This isn't quite like what G.T. did because he also extended the response of the 435Be. I haven't revisited his 1200 Array network yet.

What this does show is that the 435Be isn't all that bad with the stock network. Definitely too hot for the stock network but nothing a resistor won't take care of as per Rob in his 1400 Array Clone thread.

I did play around with optimizing the notch filter on the 435Be as well as putting a 4 kHz notch on the 045Be and the results were promising. I'll post those results if they pan out after some additional tweaking. The 045 has way too much energy in the 4kHz region which is out of its intended bandwidth but close enough to screw the whole thing up visually.

I'm glad one of the LEAP updates included the ability to strongly influence LEAP not to go below a certain impedance. When one tries to start optimizing networks wholesale (not a good thing anyway) LEAP often renders solutions that result in completely unusable impedance curves. The response curves can sure look damn nice though. Too bad there isn't an amp on the planet that could drive them.

[1audiohack]

Wooaaa! What's this?!? An actual project? How cool. It's good to see something going on out there, especially a project with serious potential.

Standing by with great interest.