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elfabyanos: I think we should rule out the case of valve amps sounding better than solid-state amps when there's a significant degree of distortion - I entirely agree with what you say about our perception of odd and even ordered harmonic distortion - but ideally we want no distortion, at least in the reproduction of sound (as opposed to the creation of sound e.g. the 2nd order harmonic distortion in an electric/electronic instrument amplifier).Other than that, the only things I'd like to add are that better quality components will have tighter tolerances and will be more linear, and that the power supplies will be likely to incorporate larger capacitors, capable of storing more energy and creating a greater reserve for when those large transients do occur.
Quote from: LeeE on 16/10/2010 19:08:12Geezer: yes, the impedance of the driver will vary with frequency, but not so far as to take into completely different realms of voltage and current delivery.Lee - Take a butcher's at this. It may change your opinion. http://users.ece.gatech.edu/mleach/papers/vcinduc.pdf
Geezer: yes, the impedance of the driver will vary with frequency, but not so far as to take into completely different realms of voltage and current delivery.
Quote from: Geezer on 16/10/2010 20:40:46Quote from: LeeE on 16/10/2010 19:08:12Geezer: yes, the impedance of the driver will vary with frequency, but not so far as to take into completely different realms of voltage and current delivery.Lee - Take a butcher's at this. It may change your opinion. http://users.ece.gatech.edu/mleach/papers/vcinduc.pdfGeez: I'm simply not prepared to wade through eight pages of an academical paper in search of what, exactly?C'mon - don't expect me to put all the effort into proving myself wrong - that's your job. And I'm not saying that the paper you referred to is not relevant, but just pick out and quote the bit of it that is relevant to this thread, and then give the link to the entire paper so I can verify it.
Lee - Take a butcher's at this. It may change your opinion. http://users.ece.gatech.edu/mleach/papers/vcinduc.pdf
Quote from: Geezer on 16/10/2010 20:40:46Lee - Take a butcher's at this. It may change your opinion. http://users.ece.gatech.edu/mleach/papers/vcinduc.pdfIgnore this, there is nothing you can take away from it that will apply to a listening envirnment. A driver's free air resonance and impedence characteristics are of interest only to the loudspeaker's designers.What your amplifier sees is the impedence curve for your loudspeaker system. The very same 8ohm driver in a closed cabinet might create an impedence of 40ohms at 50Hz, but in a bass-reflex the impendence at 50Hz might be 2.5ohms. Closed box cabinets create a high impendence at system resonance (Fs) off set by the resonance so in a well tuned system there is no significant increase or drop in perceieved output. Indeed there isn't in terms of energy transferred to the air as sound.Bass reflex loudspeakers have an incredibly low impedence at the port tuning frequency, often accompanied by two peaks either side (in a well tuned system, in a bad one the peaks will be lop sided one way or another), which is typically also near fs. What happens is that the driver vibrates much less than if it was in a closed cabinet, but the air in the port resonates instead and takes over the audio output at those low frequencies. This is also the cause of the drop in impedence.
Thanks Elfabyanos! I think that helps a lot.Would it be correct to say that a wall can act as a sort of diaphragm at low frequencies, but it acts more like a reflector or energy absorber at high frequencies?