fumac said:
He? Hahaha. I've never given my amplifiers any human personality, but that's quite amusing. Ok, I will have to do some work but I'd like to buy a couple of them for testing, probably next month before the Chinese New Year.
I'm working with others and also developing my own - to get a broader understanding of their function before sending them to the open market. I am excited to get this type of technology into a market that desperately needs it (hybrid automotive car audio) where efficiency is critical.
EnvisionAudio said:
thank u, EnvisionAudio
if you need , send me a email when you are ready
this is a story between my first user Kooka and me .
we talked about the mcd-II at that day,
and every time when he was online,
the first ask was"how about your baby? John"
that day , my English was very bad( not good too,today),
so i was confuse , i'd never told him about my family ,(Stupid thinking,🙂🙂 )
at last, he told me that the baby is meaning the amplifier....
after that, we like the baby saying .
i think that mcd is one of the Members in our home.
another thinking
if some one do like the design of himself, they will call it baby.
no father likes their baby not good as others.
will push fathers to work hard to make babies better and better.
i think this is same at Western or Eastern .
sorry , outside topic.
i will post the test pictures about mcd
fumac
1w Distortion Spectrum at 15k
most of pdf not include 15k Distortion, because they will use a 22k or 30k bandpass filter between damp and tester.
we just con net the mcd to hp3585A, no filter .
so don't comparate this with other,
the Distortion of 15k is not true when connet a 22k bandpass filter (can be almost zero)
if they have a 50k bandpass filter that will be true.
2nd Harmonic: <-80db, 0.0099%
3nd Harmonic:-79.4db,0.0112%
most of pdf not include 15k Distortion, because they will use a 22k or 30k bandpass filter between damp and tester.
we just con net the mcd to hp3585A, no filter .
so don't comparate this with other,
the Distortion of 15k is not true when connet a 22k bandpass filter (can be almost zero)
if they have a 50k bandpass filter that will be true.
2nd Harmonic: <-80db, 0.0099%
3nd Harmonic:-79.4db,0.0112%
Attachments
I would like to see distortion figures at half power with respect to clipping. When I want music, I want it loud 😀
Eva said:
yes
eva
nice to see u back again
i like to talk with others in fair
and i don't like to hear about like this : "The king is naked "
this just can tell others that he was no Technology thinking.
nothing harm to me .
do we really got the truth of the world ?
do we really got ALL the truth of the world ?
no one can be!
so no one have the right to Laugh at others.
(perhaps this just my thinking)
all the words like that i will not reply again.
any body can tell me which is not good ,
and we like to try to make it better. welcome !
to make projects better is a hold life job to me.
i like to do that.
---------
about the post,
somebody like to know about my work, it's so happy
so i will post the test pictures to tell other what happen running at 1mhz.
i will post from low power to high power,
let others easy to read it
🙂
thanks
fumac
Which THD will then be the highest ?????
The amp's ?
Your ear's ?
Your speaker's ?
😉
Regards
Charles
when a bass signal come in,
the power will raise very higher,
the treble of the sound are runing at a higher power range.
so the high power Distortion also very important in full range audio.
60w Distortion Spectrum at 1k
because the max input of hp-3585A is 42V peak
so we add a Attenuation(-10db),
so the output signal of the MCD is 25dbv(15dbv+10db)
2nd Harmonic: <-85db,0.0065%
3nd Harmonic:-81.5db,0.008%
the power will raise very higher,
the treble of the sound are runing at a higher power range.
so the high power Distortion also very important in full range audio.
60w Distortion Spectrum at 1k
because the max input of hp-3585A is 42V peak
so we add a Attenuation(-10db),
so the output signal of the MCD is 25dbv(15dbv+10db)
2nd Harmonic: <-85db,0.0065%
3nd Harmonic:-81.5db,0.008%
Attachments
this is the 7k at 60w
all the 7k test is not the same time with 1k an 15k
most of time we just check the 1k and 15k,
because we found when the 15k is good the 7k also good too.
for some body can compared with others, we add a 7k for post.
the Attenuation here is -8db,
this is 7k Distortion Spectrum at 60w
2nd Harmonic:-75.5db , 0.016%
3nd Harmonic:-78db , 0.012%
all the 7k test is not the same time with 1k an 15k
most of time we just check the 1k and 15k,
because we found when the 15k is good the 7k also good too.
for some body can compared with others, we add a 7k for post.
the Attenuation here is -8db,
this is 7k Distortion Spectrum at 60w
2nd Harmonic:-75.5db , 0.016%
3nd Harmonic:-78db , 0.012%
Attachments
all this test we use
HP-3585A Spectrum analysis for display
panasonic multiplex stereo modulator vp-7633A for signal generator
and just use transformer for power supply,
because we think,
most of people will use the transformer to power the mcd modules, so we need a test resume that not power by regulator supply.
and the pictures can let other to knowabout the detail of Distortion ,
anybody will get the Distortion of 2nd ans 3nd Harmonic of mcd.
rg
fumac
HP-3585A Spectrum analysis for display
panasonic multiplex stereo modulator vp-7633A for signal generator
and just use transformer for power supply,
because we think,
most of people will use the transformer to power the mcd modules, so we need a test resume that not power by regulator supply.
and the pictures can let other to knowabout the detail of Distortion ,
anybody will get the Distortion of 2nd ans 3nd Harmonic of mcd.
rg
fumac
fumac said:
Very good. Your numbers are impressive and appear to validate what you've been claiming. I'm just a little fish in the big sea of audio manufacturers, but I have full intent to purchase "a technology" that will fulfill my vision for the future of audio.
Hi, Fumac,
Do you use any notch filter or LPF for removing the carrier spectrum before entering HP-3585A?
What kind of filter do you use? Active? Passive?
I know that Audio Precission (AP) have a special filter for measuring classD amps.
lumanauw said:
In Post #83, Fumac states that there is no filter. I find this even more impressive.
phase_accurate said:
hi Charles
i think low Distortion at high power output is also very important
3 reasons:
1. a part of good speakers for hifi audio is low sensitive.
2. when a bass come in , need more power
3. the record of moden hiifi cd title have very large dynamic.
4. perhaps more ....
so i think a good amp also good at high power.
do u think so ?
thanks
fumac
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