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In Reply to: RE: You are missing the obvious posted by Tony Lauck on March 31, 2014 at 08:00:11:
"Those load dependent effects can also interact with the non-linear properties of the amplifier by impacting feedback, affecting stability, etc"
If it uses a lot of negative feedback then you are correct. However, amps that don't will not suffer most of these ills just FR variation with the impedance load. Matti Otalla looked into the back EMF of speakers and the impact on amplifier distortion and stability. I have seen it firsthand as well with an OTL amp that was unstable on the Acoustats I used to have...it started oscillating at a couple of watts.
"My belief is that amplifiers and speakers (and associated wiring) should be evaluated as pairs, not evaluated separately.
"
AGain, it matters a lot if the amp has negative feedback or not. If not then one just needs to know if the speaker has severe impedance swings or not and if it has adequate sensitivity. Doen't mean it will sound good (either or both components can still be crap) but that paper exercise will eliminate a gross mismatch.
" don't know why, but that solid-state edge seems to be prevalent at power up, but with the solid state equipment that I happily use, it's gone after the equipment has been powered up for 24-48 hours. IMO, solid state equipment should be run 24-7 for best sound. This does not appear to shorten product lifetimes and may possibly extend the lifetime of components by reducing the number of thermal cycles and power transients. "
While it certainly smoothes out the sound I have found that it doesn't really go away...just reduces it a bit. If the amp is Class A then you can't really leave it on all the time so you are mainly talking about relatively low bias AB amps or D amps. Even AB tubes get too hot to leave on 24/7. My own amp has a Class A single ended transistor output stage that needs a good hour to sound its best and has reached thermal equilibrium (i.e. the heat sink stops getting hotter). Before that the soundstage is a bit constricted, the depth foreshortened a bit and dynamics a bit compressed...once it warms up though...whoo boy does it expand in all ways but images get even better defined and focused. Just wish it didn't take so darn long...
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Follow Ups
- RE: You are missing the obvious - morricab 02:34:20 04/01/14 (2)
- RE: You are missing the obvious - Tony Lauck 08:20:44 04/01/14 (1)
- RE: You are missing the obvious - morricab 02:45:24 04/03/14 (0)
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