Believe or not, I think its bass is good enough to drive the 84dB
SPK, though the damping factor is not large enough and the SPK
6"(?) bass also not large enough, but it can be drived quite deep and
"punchy", sorry I don't have a good and well-trained hearing, I
just know it is a kind of fast but smooth bass .
regards,
mtlin12
SPK, though the damping factor is not large enough and the SPK
6"(?) bass also not large enough, but it can be drived quite deep and
"punchy", sorry I don't have a good and well-trained hearing, I
just know it is a kind of fast but smooth bass .
regards,
mtlin12
mtlin12 said:
It sounds well, but to test an amplifier's control over speaker cone movement, 6" driver is not good. You must atleast try 15" or 18" driver to test the amp for the bass transients handling, because large cones are heavier and also poses more reactive loading on the amp because of higher inductance of voice coil....Your amp has one unique feature, it isolates the effect of back-emf from the speaker to reach into the feedback loop....
Cheers,
Kanwar
Workhorse said:
My previous 25W 0dB Power Diamond Buffer version which used
a CFP to drive 2SA1216/2SC2922, licenced to Taiwan's Morkai had
tested with their 12" bass F-1. Also I have tested with ALTEC A5
ALTEC 604 and Klipsch horn, all very high efficiency large bass size
SPK, and all sounded well.
They used Telarc 1812/ pines of Rome and other double bass CDs
to test the non NFB amp, and can't believe it was just a 25W and
only one pair of output BJT.
The new amp has a voltage amplifier stage of course and a triple
Darlington output stage ( the same bjts with the CFB version ...
2N5401/2N5551, 2SB649A/2SD669A and Sanken's 2SA1216/2SC2922)
with 0.1 ohm Re.
Personally I think that the 50W version's bass will even better than
the previous 0dB 25W version.
Workhorse said:Hi Mtlin,
Nice to hear the reviews on your amp.....I think i am falling in love with non-feedback amps...
Have you measured the Damping Factor of your amp...??
regards,
Kanwar
Sorry not yet, just rough estimate with rough eye measured datas.
I'm just an amateur designer, my studio has no AP2 or other precision
measuring equipments. Normally my licensed customers will do that kind of jobs.
Yes, I also like this non-feedback amps more than my previous 150W amp.
But perhaps the 150W MOS amp just lack of a good VAS stage
shunt-voltage regulator.
Audio Precision instruments wont tell you about how your amp sounds....but your ear would tell you much more than any other instrument...The instruments are for measuring only, but the ear is for judgement of ambience, tonal texture, timbre, sparkle, resolution, imaging, and spacing of sound
I have a strong feeling that in feedback amps back emf injection in to feedback loop changes the amp's sonic signature to some extent, without feedback you would get a neutral sonic signature..so far...just a thought
I have a strong feeling that in feedback amps back emf injection in to feedback loop changes the amp's sonic signature to some extent, without feedback you would get a neutral sonic signature..so far...just a thought
mtlin12 said:Totally agree with you, only I'm near 50 and one of my ear was
heavily hurt several years ago when I tested a DIY headphone
amp. So now, I have to count on other friends' ears and SPKs.
You must have then turned up the volume of that amp too much which crosses the Threshold of pain limit for the ear drum i think..
Workhorse said:
No, I was too careless and hazardously doing probe test and
not taking off the headphone from the ears, some signal path
must be shorted to the Vcc or -Vcc or something like that and
one of my ear got hurt , and the two ears never balanced again
( ones' high frequency cutted off much earlier than the others...)
mtlin12 said:
No, I was too careless and hazardously doing probe test and
not taking off the headphone from the ears, some signal path
must be shorted to the Vcc or -Vcc or something like that and
one of my ear got hurt , and the two ears never balanced again
( ones' high frequency cutted off much earlier than the others...)
So your ears are now themselves acting as low pass filters....
just joking
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