waltzingbear
Member
Do not feed the Borg?
Hi,
The main difference I would mention would be: Class AB are quieter than Class D.
It's just an hypothesis. What do you think?
I just switched from my 3000€ flagship integrated Amp (Denon PMA-2500NE, 25Kg, Class AB) to 2 litlle Monoblocs, NC250MP based, paired with my ADI-2 DAC. (also, an Apollon AS1200 to come)
I noticed nothing what audiophiles are saying. I'm only enjoying very stable and clean power, with no distortion. It doesn't sound better or worse, just as good for a fraction of the price/weight/size. Period.
I just switched from my 3000€ flagship integrated Amp (Denon PMA-2500NE, 25Kg, Class AB) to 2 litlle Monoblocs, NC250MP based, paired with my ADI-2 DAC. (also, an Apollon AS1200 to come)
I noticed nothing what audiophiles are saying. I'm only enjoying very stable and clean power, with no distortion. It doesn't sound better or worse, just as good for a fraction of the price/weight/size. Period.
Is 123 dB in 90s Denons Optical Class A series comparible?The Hypex NCore 400 measured a S/N of 120 dB. I cannot point to many AB amplifiers that improve on that.
Related to GD things are not really that simple - you may find this measurement interesting. Reflections screw up everyhing in time domain, GD included, and yet it somehow doesn't seem to matter.
About the amplifier section: Look especially at the specs for the lower power levels which we seldom seeing specified from amplifier manufacturers. Do we need to replace it with a class D-amp like discussed here in this thread?
The issue with the Technics is the residual noise. It's 300uV, which is seriously high for a power amplifier, and with respect to full power the S/N isn't very good. It's only when it's weighted (excluding the hum and harmonics at the low end) does it get remotely close to the class Ds running on an SMPS.
View attachment 35740
The technics numbers may seem impressive, but it's early in the years when actual harmonic distortion was being separated from THD+N. The 'N' component clearly dominates by a huge margin. On their numbers, the S/N with respect to rated power @8ohms is only 100dB.
Yes but not so much heat like a pure class A, but a lot more than an SM-amp.This heater seems to have pretty good measurements.
Can you compare that so? Maybe we should consider if the residual noise voltage is measured A-weighted or not? Is it really an issue? Anyway, despite I am driving quite sensitive speakers (96 dB /1,2W) I can't hear any noise at all, even when I put my ear close to the treble/mid/bass elements...
Maybe little off topic, but exciting if some of these old vintage amplifiers can compete with a modern good SM-amp like NC. I mean, check the prices!
Even a power amp with a 16uV residual and an 89dB/1W speaker is audible at close range.
I will compare later with a soft dome tweeter where we are getting really close
Cheers!
Yes. Nice when the the analog parts comply with the good digital systems. It was for a quite long time when FM broadcasts was the best audio source in a home, so CDs really made the difference when arrived. Especially Philips CD104 etc, but that is another story Yes btw Denon state for their PRA-1500, 96 dB S/N for the moving magnet (special J-FET) input preamplifier, that is about same as the red book CD 16 bit system, and I cant find those low noise preamps today... Different story and off topic.. SorryI think I have a low tolerance for hiss to be honest. Coming from the analogue era and showing my age- we spent forever trying to minimize noise. Then along came digital and spoiled us, but also highlighted any areas of deficiency.