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RE: Apogees and ethics - comments

I gather that large Neodynium magnet assemblies are insanely expensive right now, I've seen some figures on DIY audio in the $1-$3 thousand range. (Though some have done quite well with factory seconds, etc.)

I'm not sure the Neo's are necessary for sound quality, for anything except the ultra-wide ribbons (and then you wouldn't necessarily need huge ones). The Neos give you great efficiency but as Wendell points out it's cheaper to buy a big amp. I read somewhere that stronger magnets give you lower distortion, but I'm not sure why that would be the case, I'd expect ribbons to be predominantly air damped and distortion to depend on the uniformity of the field rather than its strength, the precision of the air gaps, and the resonances in the ribbon. Am I missing something? Better electrical damping at low frequencies, perhaps?

Ditto Valetude's 250 pounds of steel, I gather he kept adding it until he eliminated most traces of saturation in FEMM but if you don't need the efficiency, I assume you wouldn't have to go that far.

I read last night that Linesource's 2" ribbons are crossed over at 80 Hz? With an 8-pole crossover.

I've heard it said that ribbons have an advantage in dynamics. I'm not sure why. I'd expect the planar-magnetic field to increase distortion at high excursions. I'm not sure about the compliance of the film, does it become nonlinear? Otherwise I'd expect it to store energy, as of course it does, but AFAIK that wouldn't cause compression. Maybe the ear, while it integrates over time to judge frequency response, interprets time smearing as a loss of dynamics or a change in timbre? I'm thinking back to analog synth days, and the effects of the ADSR envelope generators -- stored energy would have the effect of reducing attack and reducing decay, and both of those make substantial changes to timbre.

Do you remember approximately where John Atkinson said that about the Amati's FR and imaging? I just read the review, must have skipped over it (feeling guilty about doing this stuff right now when I should be getting to work).


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