a.wayne
Well-known member
Why is it at 8 ohms only? I recently read a discussion on whether the Class A increase power into 4 ohms like A/B. Meaning if an amp was onl Class A up to 10 watts would it pproduce more than 10 watts into 4 ohms in Class A. Although I admit after reading I still don't know the answer, I got a bit lost, however, no mention of what you said that would have made their discussion moot.
Unless the amp was made with some sort of auto increase on the Bias class A bias is fixed and will half on every halving of load ..
10w @ 8
5 watt @ 4
2.5 w @ 2
now increasing via auto Bias scheme will be complex and large , as the heatload and PSU draw would be extensive and would require serious over design and cost ..
SS amps do require the same effort to match amp to load as toobs , well even more so as there’s No output transformers to match load, speaker sensitivity will determine the SPL your amp slides out of A to Class B ..
IMO , its best to match to 33% of rated output vs speaker sensitivity and desired SPL when looking at SS amps , if you listen mostly classical a little higher class A bias for low level resolution and body is a good thing ..
Regards