WMTMW Open Baffles

[Magnetar]

Open baffle speakers -

Dual 21" Woofers 45-330 cycles 99 db sensitive

Dual JBL 2123J 330-1400 cycles 105 db sensitive

Heil Air Motion Transformer 1400 up - broad band notch filter 96 db sensitive

Horn loaded subwoofer 50 cycles down

Quad Amped - No eq needed with high sensitivity/QTS bass drivers

Sound is HUGE and natural with excellent bass definition and impact. Dynamics are very good.



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[Rocky]

U r crazy

How would you rate their performance compared to your various horn setups?

[Magnetar]

Originally posted by Rocky
U r crazy

How would you rate their performance compared to your various horn setups?

It is very good - lacks the ultimate in dynamics you get with a good 5 way horn systems but still amazing. It is very coherent - I used my Acoustat Spectra 3 fullrange electrostats as one reference when building these. These whipe them up.

Here is a comment from a freind that has heard many of my horn systems:

"i think your current setup ranks up there among your best. that dipole bass was super clean and seemlessly integrated with your subs. i would have to say that i have never heard anything as good."

Others have said pretty much the same


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[ThorstenL]

Konnichiwa

Originally posted by Magnetar
Open baffle speakers -

Dual 21" Woofers 45-330 cycles 99 db sensitive

Dual JBL 2123J 330-1400 cycles 105 db sensitive

Heil Air Motion Transformer 1400 up - broad band notch filter 96 db sensitive

Nice one. Finally a system in the vein of my "modest proposal"....

I need to build one myself when I get a bigger place...

Sayonara

[JohnL]

What are you using for crossovers? Active or passive?

BTW, this is where I'm at now. It's a junior version of yours.

[Magnetar]

Originally posted by Kuei Yang Wang
Konnichiwa



Nice one. Finally a system in the vein of my "modest proposal"....

I need to build one myself when I get a bigger place...

Sayonara

Hello,

I actually had a working system with these woofers and 15" UREI coaxials (PAS woofer and Emilar compression driver- BIG MTM) and although it was very good I went with the 10's and the Heils in the MTM. It's much better to my taste.

The 21" Madisons are great and don't really need any eq on the 24" wide baffle with 12" wings. I high pass them at 50 hz. If you don't they will go lower but at the expense of slight 'boom' or overhang and ultimate SPL.

[Magnetar]

Originally posted by JohnL
What are you using for crossovers? Active or passive?

BTW, this is where I'm at now. It's a junior version of yours.

Those probably sound great - what drivers are they?

I use active Marchand XM1 modules with Teflon caps and OPA2123's - it's pretty darn transparent

[Pano]

Wow, those are cool! I'd love to hear them.
Double 21s? Now that should move some air.

Those must get pretty loud without the diaphragms moving much.

In the same sort of style, a buddy of mine in California built a double 18 OB last year. 2 Eminence 18s front to back, an Eminence BETA-12LTA fullrange for the mids, ScanSpeak on top. All passive filtered. You can see them on stage in the photo below.

Good work! Keep it up, it's inspiring!

[JohnL]

Originally posted by Magnetar
Those probably sound great - what drivers are they?

I use active Marchand XM1 modules with Teflon caps and OPA2123's - it's pretty darn transparent

The drivers are PHL 1120s and B&G IB12 subs. B&G was getting out of the IB sub business and blew out those subs for a song. Hardly the last word in SOA bass driver, but the specs and price was right to get my feet wet with OB bass.

They do sound good, the AMT/PHL combo is probably the best I've ever heard in that range. The bass sounds good, actually great, but I think it could be better with better drivers. Perhaps I should look at those Madisons, do they really sound OK up to 330 hz? I have a set of Hartley's here, maybe I'll pull the 24s out of them.

[Magnetar]

Originally posted by JohnL


The drivers are PHL 1120s and B&G IB12 subs. B&G was getting out of the IB sub business and blew out those subs for a song. Hardly the last word in SOA bass driver, but the specs and price was right to get my feet wet with OB bass.

They do sound good, the AMT/PHL combo is probably the best I've ever heard in that range. The bass sounds good, actually great, but I think it could be better with better drivers. Perhaps I should look at those Madisons, do they really sound OK up to 330 hz? I have a set of Hartley's here, maybe I'll pull the 24s out of them.

I like the PHLs! Used the 3451 for a while with the AMT's. They sound very much like the JBL 2123's I'm using now -

The Madison is excellent (not just OK) to 400 Hz if the low pass is steep. Bi-amping is what I like with a 4th order slope. Listen to a string bass or drum set with these on an open baffle and you'll get an ear to ear grin.

Here is what a freind said about a recent gathering at my place --

" Hats off to Magnetar for another great "Ears and Beers"
his system is simply jaw dropping, I had so many big grins during dynamic music that my cheeks hurt. From the obscure to Classical it was all great music, good food, drink and laughs........hats off Mike!"