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Old 4th June 2015, 02:57 PM   #1
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Default Acoustat Center Speaker

I'm considering building a Center Speaker for my system. Currently I have a pair of Acoustat Spectra 22's for the mains. I have a lead on a 9" Panel from a Monitor-4 and I can get some MK-141 Interfaces from the Acoustat Ones.

Any feedback, thoughts or comments anyone would have for this little project? I assume the MK-141 will work well with the 4 Panel.

It is my first foray into DIY and while I admit it's more of a "Combined Components" affair, ya gotta start somewhere.
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Old 5th June 2015, 12:05 AM   #2
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Originally Posted by SimplySound View Post
I'm considering building a Center Speaker for my system. Currently I have a pair of Acoustat Spectra 22's for the mains. I have a lead on a 9" Panel from a Monitor-4 and I can get some MK-141 Interfaces from the Acoustat Ones.

Any feedback, thoughts or comments anyone would have for this little project? I assume the MK-141 will work well with the 4 Panel.

It is my first foray into DIY and while I admit it's more of a "Combined Components" affair, ya gotta start somewhere.
The MK-141 would be a fine choice for driving one or two panels as a center speaker. Keep in mind that the MK-141 is not a full-range interface (it's intended to be used along with a conventional woofer) so you won't get much below about 150 Hz. The frequency range is determined by the transformer design, so there's no way around that limitation. Attempting to drive more than two panels with the MK-141 won't harm the interface, but will likely result in a rolled-off top end. Go for it!
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Old 5th June 2015, 12:33 AM   #3
GNWT1 is offline GNWT1  Canada
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Default acoustat as centre channel

I have an earlier post showing my centre channel using a Model 1 that I modified by placing the panel in the middle of the of the frame and made it about 4" smaller in width..works very well wth my 6600's and model 2+2 and also in my other system with Sound lab 1A's with 1+1 in the rear using the other modified model 1 on its side on top of 2 Energy 18" xl subs under the 100" screen. They blend in so well with both systems.
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Last edited by GNWT1; 5th June 2015 at 12:59 AM.
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Old 5th June 2015, 03:15 PM   #4
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Originally Posted by AcoustatAnswerMan View Post
The MK-141 would be a fine choice for driving one or two panels as a center speaker. Keep in mind that the MK-141 is not a full-range interface (it's intended to be used along with a conventional woofer) so you won't get much below about 150 Hz. The frequency range is determined by the transformer design, so there's no way around that limitation. Attempting to drive more than two panels with the MK-141 won't harm the interface, but will likely result in a rolled-off top end. Go for it!
Thanks again Andy! One last question, I assume the "Woofer Out" taps are full signal since there is no cross-over in the Interface, or is there actually a filter built in to provide just the sub-150Hz signal?
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Old 5th June 2015, 03:42 PM   #5
tyu is offline tyu  United States
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Heres the setup for the 3s............same type.... one less panel in the 22...when in fullrang .....just a 1 ohm res is in the input to the panels....crossover out.....crossover in...all above 100 to the panels....
10ohm to the bass output

Last edited by tyu; 5th June 2015 at 03:49 PM.
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Old 5th June 2015, 05:32 PM   #6
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Heres the setup for the 3s............same type.... one less panel in the 22...when in fullrang .....just a 1 ohm res is in the input to the panels....crossover out.....crossover in...all above 100 to the panels....
10ohm to the bass output
Thanks Tyu, that gives me an idea of how the MK-2123 interface works with the selectable "Full Range", but on the MK-141, is that 10ohm always inline so the output is filtered to the woofer?
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Old 5th June 2015, 08:57 PM   #7
tyu is offline tyu  United States
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this a pic of the MK141...............I think the sub had it own crossover...the crossover you see here is for the 150 or 250 for the M 1 panel...
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Old 5th June 2015, 10:19 PM   #8
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MK-141 Schematic
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Old 6th June 2015, 12:18 AM   #9
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Quote:
Originally Posted by SimplySound View Post
Thanks again Andy! One last question, I assume the "Woofer Out" taps are full signal since there is no cross-over in the Interface, or is there actually a filter built in to provide just the sub-150Hz signal?
The 'woofer' output on the MK-141 is full range, with the signal passing only through the fuse. It is set-up this way so that one can use the woofer system of your choice, with it's own low-pass crossover. The low-pass crossover components shown in the MK-141 schematic are internal to the Acoustat Model One woofer cabinet and not actually part of the interface.

The same answer applies to the woofer output on the Spectra's MK-2123 interface: it is full range. The only difference is that it is switch-selectable, so that one can either run the ESL full range with the woofer off, OR with the high-pass inserted into the ESL circuit with the woofer on.
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Old 6th June 2015, 12:58 AM   #10
tyu is offline tyu  United States
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Andy.........how about the C mod for the MK141...... ... is it like the Mk121C..........were the cap are dropet to 47mf...10mf....01mf...........an some diff res added............thanks for any an all input on Acoustats
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