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a free lunch

Posted by Duke (D) on January 15, 2007 at 13:21:59

In Reply to: Re: what is a "beast family amp"...? (nt) posted by Srajan Ebaen on January 15, 2007 at 09:08:29:

OTL amplifiers with fairly high output impedances (such as the Atma-Sphere S-30) will deliver significantly increased power into a speaker's impedance peaks. If the speaker has a smooth impedance except for its bass impedance peaks, this characteristic of OTLs can be exploited to extend the bass a bit deeper than it would otherwise have gone. I have measured a 5 dB difference in the deep bass region going from a low output impedance (high damping factor) solid state amp to the S-30. By tuning the speaker lower than normal, the OTL's increased power output into the impedance peaks gives me a deep bass "free lunch".

My understanding is that this technique depends on the OTL amp approximating a current source, which I think is only possible when the output impedance is quite high. Perhaps Ralph can clarify if needed.

Duke

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