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In Reply to: RE: Mundorf M-Lytic HC+ 4-Pole 250V 22,000uF storage caps posted by Lew on September 12, 2014 at 11:21:13
Output from the speaker increased with the new 4-pole caps.
As you can see, this output increase was from 1200Hz and lower, and in the upper treble.
Follow Ups:
Do you have as a control the "before" data for the same amplifier/speaker combination that has been modified? There are so many variables here as regards the measurements that I would think such controls are necessary for interpretation of your data attempting to compare one amp/speaker to the other amp/speaker. That said, I am perfectly willing to believe that the modified amplifier is subjectively improved by installation of the Mundorf capacitors.
Hey Lew
I measured the speaker output with the original amplifier.
I left everything as is, except the MA-1's. I replaced the stock caps with the Mundorf's, reconnected the amps, let them warm up for an hour, and remeasured.
The only change in the measuring process was the replacement of the caps.
My own experience with making sound measurements with an SPL meter is that it is rather hard to get accurate and repeatable results. The tiniest of movements of the meter, the speaker, or even nearby objects, can change the measurements significantly. Did you, by chance, make analogous plots to those you posted, but measuring the output signal on the speaker wires rather than the acoustic signal?
Also, I am interested in your distortion curves. I am only familiar with FFT plots where one looks at the amplitudes of the various harmonics vs the amplitude of the fundamental. Do I understand correctly that your measuring device and software is calculating the THD level for each source frequency, as that frequency is swept through the audio spectrum? That seems pretty neat, and I'd like to know more about doing that.
Also, are those distortion plots measured on the electrical output of the amplifier, or on the acoustic output of the loudspeaker? (I would assume the former, but I'd just like to be sure.)
Chris
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