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64.12.116.141
One thing must happen is 6db crossover in soundlab Must go.Not parts upgrade.
Put in the same as Acoustat 121 set up 16ohm 50w in on high side,1ohm on low side.
Now that you can hear the spekers the 1k Degnentive must go!If you wont to get the real sound of the Circlotron
An yes if you wont to hear all ESL the bias Must be up?????
thanks
Follow Ups:
(1) You wrote "6db crossover in soundlab Must go". OK, but if you take out the crossover, what do you do with the separate bass and treble transformers in the Sound Lab speaker? Are you suggesting that one or the other of the two transformers can be used to drive the speaker full range? If so, which one of the two do you use? Please elaborate.
(2) You also wrote, "Put in the same as Acoustat 121 set up 16ohm 50w in on high side,1ohm on low side". Please define what you mean by "high side" and "low side". Are you referring to the bass and treble transformers? If so, simple resistors on either primary do not constitute a cross-over, so I gather you recommend driving both transformers full range in parallel. What does that do to the impedance presented to the amplifier? It would seem that the impedance would be lowered dangerously and there would be smearing due to the differences between the two transformers across the audio bandwidth. But I have not tried it and perhaps you have.
(3) For the thousandth time, we know you don't like the 1K resistor. Enough already with the 1K resistor.
oh my Amps dount sound right!
on my Soundlab
When I removed one of the backplates to see how the equalization was accomplished, I found that the LOWs were adjusted by selecting one of four different taps on the primary of the bass transformer, and the MIDs were controlled by placing different values of inductance in series with the primary of the bass transformer. The "0" setting used 5mH and the "+3" setting connected the bass transformer directly to the input (no inductor). The high-frequency toroidal transformer was connected to the inputs through a single-pole high-pass filter where the series C=48uF (two 24uF polyproylenes in parallel) and the shunt R=5 ohms (four 5 ohm 10W in series/parallel), for a corner frequency of 660Hz. This explained a lot, since the presence of the 5 ohm resistor meant that the overall impedance could be no higher than 5 ohms above the corner frequency,
an the parts in my 10k+A3 look like thay came from Ratshak!
hang 5ohms on your amps+ - outputs
crossover must go.........no Super R an parts upgread Needed!
thanks
tubevibb, you are absolutely right about the high pass filter in your SLs. Yours must be an older version, as they are now using a higher R value and lower C to end up with a -3db point of 550Hz. Also I agree about the parts quality, although the audio transformers are superb if you compare them to what is inside a Acoustat or Martin-Logan. Anyway, I have bypassed all those switching devices and hard wired the bass transformer at its "0db" input and the treble transformer at its "0db" input. For the RC network, I use an 8- or 10-ohm resistor and about 34 uF capacitance, derived by paralleling many 2-uF polystyrene film/foil caps. The R should be high quality, high wattage too. Of course it goes without saying that you must remove or bypass the "Brilliance" control too. That thing really hurts the treble purity. To go to the next level, you must change the value of the caps in the "mixer" box, on the secondaries of the two transformers. That's a tricky job but helps a lot to improve the impedance curve. So the solution to the hi-pass filter is to improve it, not to throw it away.
yes lew you are right i see
but i am not welling to giveup 2-3db an i no i have a lot of Snell B&w M logen lot money in spekers that all have Caps in the crossovers!
But now that i can Seeeeee with the A3 an put Shunt 10ohm 12ohm or what ever it not right on the output of my Diy M2, well all i can say is it all about the sound an if you like yours good i to dig that for you.but it night an day with no cap an Shunt.
an thanks for your time as allwayes
Allen
I still don't get it. With no cap there is no high pass filter and you are driving the treble transformer full range. According to Roger West, the toroidal treble transformer will saturate at low frequencies and should sound distorted at 100-200Hz and below, could even be damaged. yes, 10-12 ohms is a better load for the amp than 5 ohms, and I do recommend that change but not without a capacitor. But this is the OTL asylum, not the ESL asylum.
lew did you get my email
fd
nt. tubevibb52@wmconnect.com if you would like to see the new Soundlab A3 set up?
thanks
I've still not received any private mail from you. However, I can't imagine how you are adapting an Acoustat input circuit for use in Sound Lab speaker, which is very different design.
nt.
well about that 1k across the +- output of the Circlotron i was not sure be for the mod to the A3s crossover after mod it was clear not right!
only the SoundLabs an then i saw the lite
thanks
PS but the bias has got to be right or nothing is
you did not answer my questions regarding how you would use the two (bass and treble) audio transformers in a Sound Lab full-range ESL, once you've removed the 6db/octave crossover. Also, what or which "bias" are you referring to, the bias voltage on the ESL speaker or bias of the amplifier output stage? Sound Lab are the only ESL makers I know of who allow adjustment of the bias voltage on their speakers, but the adjustment is across a range determined by other aspects of the design (space between stator and diaphragm, conductivity of stators, coating on diaphragm, etc). Getting the bias "right" also depends upon the conditions in one's own listening room, e.g., humidity.
lew it in your email the Xfourmers setup!
An yes it the ESL on the bias an if you have high v prob you can read any ESL bias in your space an time yes you are right!
most are off Acoustat 5k but thay are old run at 3k6 you get 5k you got a new set,but the A3s thay two must be there
thanks
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