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Old 30th August 2008, 10:46 AM   #11
SY is offline SY  United States
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Quote:
Originally posted by planet10
I can't remember exactly how i did it, but when i had my 1+1s i rewired it to drive the HF trafo with one amp & the LF with another. A big improvement in dynamics (i was using 2 NAIM 160)

dave
It's actually pretty easy. Each transformer has a separate primary circuit. It's just a matter of adding another set of input jacks, then separating the inputs to each primary circuit. At least that's how you did it...

I was actually happier replacing the paired input transformers with a single unit with a lower turns ratio (higher bandwidth), then actively biamping with external woofers.
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Old 30th August 2008, 11:04 AM   #12
jam is offline jam  United States
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Hi Sy,

I have had the same results.

What transformer did you use and have you tried the Plitrons?

Regards,

Jam
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Old 30th August 2008, 12:00 PM   #13
SY is offline SY  United States
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The Plitrons are waaaay out of my price range. I used an output transformer run backwards, about 30:1.
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Old 31st August 2008, 05:49 AM   #14
pwgtang is offline pwgtang  Armenia
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pforeman
No, no need to wire inside the stators.
1.separated the 0.01 caps and the 50k resistors.
2.label each wires come out from the panel.each panel had four
wires two for front and two for rear stator.
3.one side of the wires had blue mark,do not mix the wires to other
side.
4.feed one front and one rear stator wire to each of the cap,arange
them like mirror.
5.feed the one front and rear stator wire to each of the 50k resistor.



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Old 31st August 2008, 09:15 PM   #15
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You realize that by doing this that you may have altered or flipped the phase relationship between the two transformer's signals WRT the panels?

Check the frequency response...

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Old 1st September 2008, 04:00 PM   #16
pwgtang is offline pwgtang  Armenia
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Hello,
I only do listening test so far,I had modify one channel yet,so I can
compare with the other one.I listening with the mono source music
low and mid frequency very closed ,but I notice the HF more detail
and very directional,the sweet spot between the side and the middle
of the panel. I switch those wires,the sweet spot move to other side of the panel.
I think I will wire the L and R chanel speakers to a mirror pair.
If I stand on front of the speaker about two to three feet and moved
my heard left and right I can feel the HF spot on the modify one,but
no feel on the original one.
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Old 19th November 2008, 12:25 PM   #17
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Hi, I redid my acoustat 2+2's interfaces with all new capacitors,
changed the HV resistor to 25 Mohms, and I divided the speaker into two halves according to the directions several posts above.
sounds good !, but measures low in the 100 Hz - 400 Hz range by about 4 dB.
It is in this range that my speakers previously had a little too much output by about 4 dB.
I made sure that the "blue wires" which were the rear side were split to the cap on the side of the blue output (resistor).
Do any others who have tried this mod find a decrease in upper bass like this?
Thanks,
Paul
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Old 19th November 2008, 03:12 PM   #18
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I've heard a really great mod is to just disconnect the high
transformers and do a gradual crossover to some ribbon
tweets (on the pri. side of course).
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Old 19th November 2008, 05:28 PM   #19
pwgtang is offline pwgtang  Armenia
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I had parrel a resistor and cap on the speaker input to take care the upper bass problem and settle at 10w 1.5 ohm and 235 uf cap.
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