The MK-121 series of interfaces (all variations) is designed to drive a maximum of 4 panels. Increasing the number of panels will provide more bass (probably too much for most tastes) and increased HF roll-off (probably too much for most tastes) due to the increased capacitive load of the additional panels. This is why the Models 6 and 8 used two interfaces per speaker, with different LF transformers and different RC combiner values.
Simple answer: you won't hurt anything, but it's not advisable as you probably won't like the result (especially frustrating after doing all that work).
Simple answer: you won't hurt anything, but it's not advisable as you probably won't like the result (especially frustrating after doing all that work).
Andy, sorry to bother you! Did the model Six & Eight use (1) regular interface and (1) special interface or (2) of the special ones? I think I sold maybe a pair of two, but didn't install either one, so I can't remember. THANKS!!!
Hello Andy. We worked together at Acoustat in Tempe. My name is Bud Lewis. I still have the pair of spectra 3300s and subwoofer. I have them in the storage. They are too large for my living room, and considering selling them. any thoughts of where I could do that?
Bud, how much do you want for them? Where are you located? Thanks! Wood finish and fabric color please. Thanks again.
I bought 2 of these for my Spectra 66, would recommend, even has the acoustat logo on it. Link to ebay
If you need to get something working while you wait, any 12-15v AC or DC wall wort should work.
Should I Add an EMI/RFI Cap to my Acoustats?
I have Model 3's.
I was thinking to add a capacitor after the fuses, across the AC power in, which goes to the high voltage bias supply transformer. The interface is plugged into a power conditioner. This is to add a last filter on the incoming AC line and to help filter any noise from the bias supply going back to my power conditioner or AC line and thence to other components. I was thinking of a polypropylene cap, around 0.1 uF, safety Class Y2 * (In failure mode it opens, not a short circuit).
I had first selected a capacitor with longer leads, but it's not in stock. So, with lower ESR (electrical series resistance) than a less expensive one (lower is a good thing), this cap I can make fit:
EPCOS-TDK B32023B3104K000
https://www.digikey.com/en/products/detail/epcos-tdk-electronics/B32023B3104K000/3489494
Have you tried this?
What was the result?
Is there any downside to doing this?
Note: also in this bias circuit I am planning on adding the snubber circuit after the transformer, per the thread:
Transformer Snubbers See posts 1, 25.
(Linked to from Post 2,176 of this thread.)
I do not think the snubber will interact (much) with what I propose, which has a different purpose. But I am not an EE, so I am asking.
Brandon
* Note: I found a good explanation of Class X and Class Y capacitors here:
https://www.allaboutcircuits.com/technical-articles/safety-capacitor-class-x-and-class-y-capacitors/
I have Model 3's.
I was thinking to add a capacitor after the fuses, across the AC power in, which goes to the high voltage bias supply transformer. The interface is plugged into a power conditioner. This is to add a last filter on the incoming AC line and to help filter any noise from the bias supply going back to my power conditioner or AC line and thence to other components. I was thinking of a polypropylene cap, around 0.1 uF, safety Class Y2 * (In failure mode it opens, not a short circuit).
I had first selected a capacitor with longer leads, but it's not in stock. So, with lower ESR (electrical series resistance) than a less expensive one (lower is a good thing), this cap I can make fit:
EPCOS-TDK B32023B3104K000
https://www.digikey.com/en/products/detail/epcos-tdk-electronics/B32023B3104K000/3489494
Have you tried this?
What was the result?
Is there any downside to doing this?
Note: also in this bias circuit I am planning on adding the snubber circuit after the transformer, per the thread:
Transformer Snubbers See posts 1, 25.
(Linked to from Post 2,176 of this thread.)
I do not think the snubber will interact (much) with what I propose, which has a different purpose. But I am not an EE, so I am asking.
Brandon
* Note: I found a good explanation of Class X and Class Y capacitors here:
https://www.allaboutcircuits.com/technical-articles/safety-capacitor-class-x-and-class-y-capacitors/