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In Reply to: RE: Great speakers! posted by Lew on August 18, 2015 at 08:20:26
What kind of Soundlab requires a crossover? I thought they were full-range like my Acoustats were.
Interestingly, I demoed my Ref 3as with a Graaf GM20 OTL...fantastic. I use SET amps at home for the moment but I might try a transcendent SE OTL. (their new ones are 4 watts stereo and 12 watts mono).
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Actually, many Acoustats have a crossover used in exactly the same way as is the one used in the full-range Sound Lab speakers: Inside the "backplate" you will find two audio step-up transformers, one for the bass and one for the treble. There is a first-order crossover network that divides the incoming frequencies to feed the two transformers. Sound Lab actually copied this approach from Acoustat. In the SL speakers, the low pass filter is an inductor, in series with the input and the primary of the bass transformer. The hi-pass filter is an RC network, with C in series and R in parallel with the primaries of the treble transformer. On the secondary side, the two transformers are tied together and do drive the panel as if it were a one-way speaker. Very small value capacitors are used in series to isolate the secondaries of the treble transformer from those of the bass transformer.
That is true for the older 1+1 and 2+2 etc. The spectras did something different and had a High voltage crossover that was using resistors and the native panel capacitance as near as I could tell. Two transformers but of equal size...not like the 1+1s I had. In all I had three pairs of Acoustats (1+1, Spectra 2200 and Spectra 4400)...all at the same time! The 2200s were the best sounding overall...very transparent but full sound. The 1+1 were a bit leaner but slightly more opaque sounding and the 4400s were for some reason I could never figure out slightly dark and a bit muffled sounding...made amazing subwoofers though, which is ultimately how I used them.
By this do you mean that the filtering was done after the secondaries of the step-up? Yes, I see how that could be done with the proper very high voltage rated resistors, in theory.
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