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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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In Reply to: MA-1 and speaker impedance posted by xluorp on June 2, 2006 at 17:18:31:
Mike,Hello.
First thing, in my experience speakers and OTL amplifiers (ala my Atmas), the less you put into a crossover, the better. Actually, I feel this way regardless of the amplification, but it's ESPECIALLY true when it comes to OTL.
Think of crossover components as "speed bumps", which soak up the energy and life you have purchased these amplifiers for. And, although you may flatten the impedance curve, it will be flattened to the lower, not higher values. Even if the curve looks better, when you take the phase angle of the loudspeaker into account, you will very likely end up with something that looks much worse than when you started.
In terms of a few real world examples, think of Dynaudio and Thiel loudspeakers. Yes, they have all of this circuitry that flattens spikes, removes notches, etc., and even claim to be first order networks in many instances. Both are among the poorest choices for loudspeakers to mate with OTL amplifiers because they are such brutish loads.
Also, and this will be a bit controversial, I suggest wiring the crossover in series, as opposed to in parallel. It's a lot easier than the voodoo series crossovers are labeled. Just stay simple, and let things come to you. My personal experience has shown that Atmas and speakers wired with purist series crossover networks are the best matches for either of them. Even when the speaker is listed as a 4 ohm load. It never made sense to me until I spoke to both Ralph Karsten and Bud Fried. Not to make this e - mail any longer than it needs to be, but I'll say that there is some definitive synergy that evolved here.
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Follow Ups
- Re: MA-1 and speaker impedance - Trelja 12:19:57 06/12/06 (0)
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