From my limited experience, the sort of amps that we are discussing seem much more sensitive to frequency respsonse changes than conventional amps. You are very likely to find that most listeners will say that one that is more rolled off than an AB amp will still sound brighter.
I won't even bring up the subject of what most say about the midrange...............
Jocko
I won't even bring up the subject of what most say about the midrange...............
Jocko
Bruno Putzeys said:
My dipole speakers help me to hear less of the room and the current room that I use is quite small but quite well damped. In combination with the dipoles that gives quite good imaging and non-booming bass. I also listen relatively near-field with the speaker about 1.70m apart. Previously in the living room they were 3m apart.
Yes, I happen to have the Ray of Light CD and it has indeed surround effects but it is not really my cup of tea to listen to that sort of music. 🙂
Best regards
Gertjan
I must correct myself, and apologize for exaggerating this difference. Now i had the opportunity to actually measure the differences, the exact figures are (Ferrite Volumetric Weight):
ZAPpulse: 75 gr
UcD: 22 gr
Icepower: 20 gr.
So it's not 8 times and 16 times difference, more like 3,5 times. Sorry my mistake
Lars Clausen said:
I must correct myself, and apologize for exaggerating this difference. Now i had the opportunity to actually measure the differences, the exact figures are (Ferrite Volumetric Weight):
ZAPpulse: 75 gr
UcD: 22 gr
Icepower: 20 gr.
So it's not 8 times and 16 times difference, more like 3,5 times. Sorry my mistake
Hi Lars,
At least very nice that you correct yourself here in public.
Best regards
Gertjan
Now that i have my new THD analyzer up and running, i just did some tests of the Phase Accurate compensated slightly modified ZAPpulse 2.3SE.
Load is 4 Ohms, 10W RMS (6.3 Vrms). The THD floor of this analyzer is 0.0033%
ZAPpulse 2.3SE with Phase Accurate compensation as shown:
Compared to another well known Class D amplifier, with low THD:
(Measured under exact same conditions).
Another Class D amplifier with low THD:
So it appears Charles' feedback system can improve THD...
All the best from Denmark 🙂
Load is 4 Ohms, 10W RMS (6.3 Vrms). The THD floor of this analyzer is 0.0033%
ZAPpulse 2.3SE with Phase Accurate compensation as shown:
An externally hosted image should be here but it was not working when we last tested it.
Compared to another well known Class D amplifier, with low THD:
(Measured under exact same conditions).
Another Class D amplifier with low THD:
An externally hosted image should be here but it was not working when we last tested it.
So it appears Charles' feedback system can improve THD...
All the best from Denmark 🙂
Lars Clausen said:
Hi Lars,
Very interesting, can you place the details of the modification on this board as I quickly looked but could not really find it here and we should be sure that people who want to try it have the correct info.
Best regards
Gertjan
by the way, how does it sound? and what does it do to the square wave response versus load? does that also become UcD like?
I never expected anything else, but I didn't expect it to be that much.......
I expect an improvement in that respect as well but it will still have less control than a pure post-filter feedback.
So let's see what result Lars is going to show us.
Regards
Charles
phase_accurate said:
I never expected anything else, but I didn't expect it to be that much.......
I expect an improvement in that respect as well but it will still have less control than a pure post-filter feedback.
So let's see what result Lars is going to show us.
Regards
Charles
I am once again tweaking my amp...Charles
Some good results could be expected from my side too....
Kanwar
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