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In the Forum: Audio Discussions
In the Thread: Passive transformer based preamp
Post Subject: Re: a lightly a different subject: OTLPosted by morricab on: 11/4/2005

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I do have a speaker with a flat impedance.  It is an Apogee Caliper Signature with an impedance variation from 3 to about 4.5 ohms over the whole range.  Fortuneately it is not so dead as your example as it has about 86db sensitivity.  However, it is like an electrostat in that inspite of having a low voltage sensitivity it does not sound "dead" like a conventional box speaker of the same rated sensitivity.  This could be due to the moving mass of the drive elements or because thermal compression of the planar drivers is not a concern like it is for a normal low sensitivity cone.   I also have full range electrosats so here again is a design good for OTL.  High sensitivity horns (with moderately high impedances) should work very well indeed and I don't see again why they shouldn't be OTL friendly.  You have a similar problem with matching loads with a SET amp of moderate output impedance.  You will certainly get frequency response variations unless the same conditions are met.

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