Hi everyone, a friend lend me a TVC (Music First Audio Classic), I putted between my dac, Hugo 2, and the power (First Watt J2) and made some test.
For my surprise I noted my amp more "vivid", with more separation and tight bass. So I made some measurements, and a I found a cut in frequencies over 5 khz. I tested with the amp full open, half and with +6db boost, always the same. But it seams the only effect, every other frequencies looks the same after attenuation.
My procedure, put Pure Pink Noise from Tidal and up the DAC volume until get 80 db. tested with AudioTool, then draw the peaks for 1 minute.
My results:
Without preamp (direct from dac to power)
With preamp full open:
No pream (zoom):
Preamp (zoom):
Are my results consistent with your experiences?
Thank you,
For my surprise I noted my amp more "vivid", with more separation and tight bass. So I made some measurements, and a I found a cut in frequencies over 5 khz. I tested with the amp full open, half and with +6db boost, always the same. But it seams the only effect, every other frequencies looks the same after attenuation.
My procedure, put Pure Pink Noise from Tidal and up the DAC volume until get 80 db. tested with AudioTool, then draw the peaks for 1 minute.
My results:
Without preamp (direct from dac to power)
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With preamp full open:
An externally hosted image should be here but it was not working when we last tested it.
No pream (zoom):
An externally hosted image should be here but it was not working when we last tested it.
Preamp (zoom):
An externally hosted image should be here but it was not working when we last tested it.
Are my results consistent with your experiences?
Thank you,
Your measurements are impossible to take seriously. Get at least a laptop with a sound card and take electrical measurements.
These transformers have been measured by many here, myself included, and show no weird and impossible behaviour. A combination of high impedance source and severe capacitive loading can affect the highs but not to this extent.
But, why electric measurements if I want to check test the sound in my sofa? 😉
By the way the micro is a calibrated one. And if I made 2, 3 or 4 measurements, and the only change is the pre and gain, and sounds different, should be something there or not?
I don't want polemize, I'm just sharing an experience. I'm not pro, just amateur enjoying testing.
You need to remove the room acoustics from the measurements or you'll be swamped by room effects, multipath, microphone directionality/orientation effects, etc etc. Basically to measure X, don't measure Y, measure X.
HF response in a room changes from inch to inch throughout the space, and its detail is affected by pretty much every everything.
HF response in a room changes from inch to inch throughout the space, and its detail is affected by pretty much every everything.
Or easier still, just listen. When acoustic instruments sound like acoustic instruments in your room, you are there.
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