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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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In Reply to: Re: question on driving Sound Labs with Atmas posted by Ralph on July 22, 2002 at 11:00:14:
Ralph: The SL spkrs have bass and mid-range level controls. One can select among -6, -3, 0, and +3db contours. In the +3db position, there is no roll-off of the bass transformer, as you surmise. But in the 0 db position, I am told there is a 5mH inductor in series with the primary. For -3db and -6db contours there are series inductors with increasing inductance. When he optimized his A3s for impedance, Kevin Covi used the +3db position, but he inserted a 1 or 2 mH inductor in series, as per your idea on the desireability of having at least some roll-off.
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Follow Ups
- roll-off of the bass transformer in the SL spkrs - Lew 07:42:31 07/25/02 (2)
- Re: roll-off of the bass transformer in the SL spkrs - Roy 15:44:13 07/25/02 (1)
- Re: roll-off of the bass transformer in the SL spkrs - ivanj 09:10:40 07/27/02 (0)
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