MissMarplesexbomb
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- Jul 21, 2020
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Would love some double blind tests done by ear only of dacs.
Would love some double blind tests done by ear only of dacs.
So far, those haven't turned up an identifiable difference. I believe the last one I saw @amirm set up for himself was with the TotalDac some time ago... Even with its crap numbers, he couldn't differentiate between it and (I believe) a Topping.
I'll see if I can find it in that epic thread.
Edit: Can't find it quickly, but this might give an idea of whether our host believes the effort would be worth it.
https://www.audiosciencereview.com/...-totaldac-d1-six-dac.8192/page-85#post-221357
This might be a stupid question but if you can't here the difference between dacs what good are measurements to you ?
Hello,
I would like to see a Driverack PA2 test, if possible.
Best regards,
Please send a private message to @amirm to discuss measuring the DBX PA2.I have a PA2 and I'm willing to deliver it to Audio Science Review. How much time would be needed?
The DBX PA2 has a pair of analog inputs, 48kHz sampling, proprietary 16 bit conversion (dbx Type IV™ Conversion System) and 3 pairs of analog outputs. The DSP can be programmed to act as a crossover between the outputs, and an 8 band parametric EQ which can be used for room EQ or other purposes. It also has other features which don't apply to accurate home listening. There are YouTube user manuals out there.
Here is the start of a test plan.
Pair the PA2 to a tablet or computer with their graphical app
1 With the system in 1 in 1 out mode, flat, measure the frequency response. Then measure harmonics, say at 1kHz, and noise across the range.
2 With the system in 1 in 3 out mode (sub+mains, biamped) measure the frequency response and phase response across each output. Measure harmonics for tones around the crossover frequencies.
3 With the system in 1 in 3 out mode, auto EQ the room. Then measure for only the Driverack, the frequency and phase response across each output.
4 With the system in 1 in 1 out mode, use one of the 8 parametric EQ filters. Scan phase response. Inject a tone at various points around the filter and measure harmonic distortion. Try this for high pass, low pass, peaking and cutting, at various Q, including maximum Q.
5 My favorite feature. I do not know how to test their subharmonic synthesizer. Perhaps if you put in a tone, it will generate the corresponding subharmonic tone(s). If so, measure the undesired harmonics in relation to the 1 or 2 synthesized subharmonics at various subharmonic control settings. Perhaps Audio Precision has some experience with this use case, or DBX themselves.
Digital amplifiers do not exist.Some tube amplifiers. Only one or two have been measured as opposed to multiple digital amps.
A friend has one locally but with so much to do, I don't feel like pestering him for it.Lampizator DAC.
No problem. I just though it would be interesting to give Lampizator a closer look. I’ve heard a lot of hype from people I trust but never heard one in person. Lapizator implements old and forgotten tube designs with today’s technologies as far as DACs are concern. I’ve exchange emails with owner long time ago before his brand became a household brand. He was much more approachable then. And I almost pulled a trigger on his original (I think) tube dac but felt that it was overpriced. Today, almost everything on his website seems to be aimed at selected crowd with money to burn. I don’t mind paying premium for something “different” and original but I feel that it might be a bit overhyped.A friend has one locally but with so much to do, I don't feel like pestering him for it.