This is a review and detailed measurements of the VTV Purifi class D amplifier with SIL 994EnH-Ticha Pro Opamp buffer stage (one of the options). It is on kind loan from a member and costs US $1,845 in this configuration.
It was love at first sight when I saw this rack mounted case with handles:
Yes, the amp is light so the handles are really not needed but it is cool nevertheless.
Speaking of cool, the amplifier never warmed up in any of my tests.
Typical of this class of amplifier, only balanced XLR inputs are provided:
There is an option for SpeakOn speaker terminals.
We already know the measurements of the Purifi amplifier Reference Design. Question is whether the assembly and choice of SIL op-amp has an impact on the measured performance.
NOTE: I mistakenly labels the original review and graphs as 990Enh. It is actually 994Enh.
VTV Purifi Amplifier with SIL Buffer Measurements
As usual we start with our 5 watt dashboard into 4 ohm load:
Gosh, that ugliness in the FFT spectrum really makes you lose your appetite coming from squeaky clean reference design:
The noise is triggered by the power supply. Whether op-amp is the source of the power supply or combination of both is hard to say. What is not hard to say is that we have lost some performance which also shows up in SNR:
Fortunately performance is still superb in grand scheme of things:
Crosstalk thankfully is as excellent as the reference design:
Frequency response however is truncated a bit:
Power levels are the same as reference:
I did not run the peak and max power at the time of the original review so we have some new data points:
As well as this test for frequency sensitivity:
I will have to run this on Purifi reference at some point to see how it did. I am thinking the buffer is messing this up right now.
Finally, multitone test which clearly shows power supply related spikes:
Conclusions
VTV had me happy with its case work. Alas, the buffer as chosen appears to drag the pristine performance Purifi module down. Despite that, overall excellence of Purifi engineering still shows, allowing this amp to still outperform some 140 amplifiers tested to date!
I can't recommend the VTV with the buffer as chosen. Hopefully other variations don't leave performance on the table this way.
Edit: see the teardown here: https://www.audiosciencereview.com/...er-teardown-sil-990enh-ticha-pro-opamp.24861/
------------
As always, questions, comments, recommendations, etc. are welcome.
My daily routine is to eat dinner and then go to the garden and work and work and work. Come back in all sweaty. Clean up and then do reviews like you see. It is a very strenuous routine than makes me wonder why I do it. Then I see a cucumber like this in the greenhouse and it makes it all (almost) worthwhile!
Can't find stuff like this in the grocery story. Letting it grown for a couple more days before eating it!
Appreciate any donations using: https://www.audiosciencereview.com/forum/index.php?threads/how-to-support-audio-science-review.8150/
It was love at first sight when I saw this rack mounted case with handles:
Yes, the amp is light so the handles are really not needed but it is cool nevertheless.
Speaking of cool, the amplifier never warmed up in any of my tests.Typical of this class of amplifier, only balanced XLR inputs are provided:
There is an option for SpeakOn speaker terminals.
We already know the measurements of the Purifi amplifier Reference Design. Question is whether the assembly and choice of SIL op-amp has an impact on the measured performance.
NOTE: I mistakenly labels the original review and graphs as 990Enh. It is actually 994Enh.
VTV Purifi Amplifier with SIL Buffer Measurements
As usual we start with our 5 watt dashboard into 4 ohm load:
Gosh, that ugliness in the FFT spectrum really makes you lose your appetite coming from squeaky clean reference design:
The noise is triggered by the power supply. Whether op-amp is the source of the power supply or combination of both is hard to say. What is not hard to say is that we have lost some performance which also shows up in SNR:
Fortunately performance is still superb in grand scheme of things:
Crosstalk thankfully is as excellent as the reference design:
Frequency response however is truncated a bit:
Power levels are the same as reference:
I did not run the peak and max power at the time of the original review so we have some new data points:
As well as this test for frequency sensitivity:
I will have to run this on Purifi reference at some point to see how it did. I am thinking the buffer is messing this up right now.
Finally, multitone test which clearly shows power supply related spikes:
Conclusions
VTV had me happy with its case work. Alas, the buffer as chosen appears to drag the pristine performance Purifi module down. Despite that, overall excellence of Purifi engineering still shows, allowing this amp to still outperform some 140 amplifiers tested to date!
I can't recommend the VTV with the buffer as chosen. Hopefully other variations don't leave performance on the table this way.
Edit: see the teardown here: https://www.audiosciencereview.com/...er-teardown-sil-990enh-ticha-pro-opamp.24861/
------------
As always, questions, comments, recommendations, etc. are welcome.
My daily routine is to eat dinner and then go to the garden and work and work and work. Come back in all sweaty. Clean up and then do reviews like you see. It is a very strenuous routine than makes me wonder why I do it. Then I see a cucumber like this in the greenhouse and it makes it all (almost) worthwhile!
Can't find stuff like this in the grocery story. Letting it grown for a couple more days before eating it!
Appreciate any donations using: https://www.audiosciencereview.com/forum/index.php?threads/how-to-support-audio-science-review.8150/
Last edited:
