What is the -153 ms referring to? I don't see this in the other results you published. Is it something important? Something I did wrong?

It is the delay to be applied to the loopback copy for computing the difference between it and the original.


Loopback tests requested by forum members: Eventide H8000FW (for validating or invalidating the test from jeamsler), Pacific Microsonics Model One and Model Two, SSL 2+, RME M-32 AD Pro --> M-32 DA Pro, RME M-1610 Pro, Audient iD14 MKII, Prism Dream DA-2 --> AD-2, BlackLion Audio Revolution 2×2, RME MADIface Pro, RME Fireface UCX II, SSL BiG SiX, Prism Sound Dream ADA-128, anything from Qes Lab, JCF, Burl and Linn, PreSonus Studio 192, iZ RADAR, Avid HD OMNI, Cranborne Audio 500R8, Fractal Audio Systems Axe-Fx III, NEVE MBC, Sound Blaster X7, Focusrite ISA 428, Elektron Octatrack MKII , Burl B2 Bomber ADC ---> DAC, dCS, Antelope Amari, Black Lion mods (e.g. Apollo X mods), Lynx Hilo 2, new (2024) MOTU 828, Forssell MDAC-2 ---> MSB Studio ADC as master, Solid State Logic SSL 18. Of course any other one welcome!

Here is loopback recording of Focusrite Scarlett Solol 3rd Gen.
Single tones , but also the more interesting multitones (2-tone, 3-tone and 16 NID (non inter-harmonic distortion tones)

I think this eliminates the clocking issues that others have brought up in discussions

So this is both DAC + ADC combined performance

Would be interesting to have a database of this also

Most interfaces with an integrated DAC and ADC use the same clock to drive both, so there should be no clocking issues other than possibly some delay due to buffers, filters, etc. Clock drift and jitter become a potential complication when measuring DACs and ADCs with independent clocks that run asynchronously from each other.

Sorry, instead of clocking, I meant to say the phase differences that you have previously posted about. Probably due to digital filter types (min phase vs lin phase) and filter quality

Hi. Here are files for the RME HDSPe AIO Pro audio interface.

I did 2 runs for each of the reference levels (+4/+13/+19/+24dBU). I've used XLR balanced I/O. Buffer was at 256.

I have also included a file named "Sanity check - should null to -inf", which is direct recording with no DA/AD, in order to make sure that my DAW (Studio One) does not introduce any bias.

Thanks Didier!

RME HDSPe AIO Pro - XLR @ +4dBu - Run 1.wav
-773 ns, 0.2168 dB (L), 0.1853 dB (R), -42.9741 dBFS (L), -44.0806 dBFS (R)

RME HDSPe AIO Pro - XLR @ +4dBu - Run 2.wav
-774 ns, 0.2164 dB (L), 0.1850 dB (R), -42.9761 dBFS (L), -44.0826 dBFS (R)

RME HDSPe AIO Pro - XLR @ +13dBu - Run 1.wav
-612 ns, 0.2138 dB (L), 0.1898 dB (R), -42.9765 dBFS (L), -44.0828 dBFS (R)

'RME HDSPe AIO Pro - XLR @ +13dBu - Run 2.wav
-612 ns, 0.2139 dB (L), 0.1899 dB (R), -42.9763 dBFS (L), -44.0826 dBFS (R)

RME HDSPe AIO Pro - XLR @ +19dBu - Run 1.wav
-522 ns, 0.2223 dB (L), 0.2102 dB (R), -42.9742 dBFS (L), -44.0808 dBFS (R)

RME HDSPe AIO Pro - XLR @ +19dBu - Run 2.wav
-522 ns, 0.2224 dB (L), 0.2103 dB (R), -42.9740 dBFS (L), -44.0805 dBFS (R)

RME HDSPe AIO Pro - XLR @ +24dBu - Run 1.wav
-521 ns, 0.0931 dB (L), 0.0867 dB (R), -42.9735 dBFS (L), -44.0803 dBFS (R)

RME HDSPe AIO Pro - XLR @ +24dBu - Run 2.wav
-521 ns, 0.0932 dB (L), 0.0868 dB (R), -42.9731 dBFS (L), -44.0799 dBFS (R)

To be added to the next issue of the list of the results.

It nulls at about -310 dBFS because of the limited accuracy of my Matlab routine (-225 zs).

Tascam US-16x08, using front Mic/Line XLR inputs 1 and 2 and TRS outputs 1 and 2

Updated google drive link for Tascam US-16x08 (previous .wav had clipping)

https://drive.google.com/file/d/1hTZ...ew?usp=sharing

-154.312405 ms, 1.8797 dB (L), 2.2294 dB (R), -33.6553 dBFS (L), -34.9504 dBFS (R)

To be added to the next issue of the list of the results.

Links to:

Presonus DP88 int sync

Presonus DP88 ext sync

Presonus Studio 192 int sync

Link:

Beis AD24QS DIY Analog to Digital Converter (DA = Presonus Studio 192)

Presonus DP88 int sync.wav
-2.220774 ms, 1.2981 dB (L), 1.3745 dB (R), -43.9422 dBFS (L), -45.1629 dBFS (R)

Presonus DP88 ext sync.wav, 'ext sync': which one ?
-1.948673 ms, 1.2991 dB (L), 1.3752 dB (R), -43.9297 dBFS (L), -45.1491 dBFS (R)


Presonus Studio 192 int sync.wav
-1.833869 ms, 0.1359 dB (L), 0.2056 dB (R), -48.2670 dBFS (L), -49.7290 dBFS (R)

-1574456 ms, 5.3680 dB (L), 5.3700 dB (R), -45.6703 dBFS (L), -47.0486 dBFS (R)

To be added to the next issue of the list of the results.

Loopback tests requested by forum members: Eventide H8000FW (for validating or invalidating the test from jeamsler), Pacific Microsonics Model One and Model Two, SSL 2+, RME M-32 AD Pro --> M-32 DA Pro, RME M-1610 Pro, Audient iD14 MKII, Prism Dream DA-2 --> AD-2, BlackLion Audio Revolution 2×2, RME MADIface Pro, RME Fireface UCX II, SSL BiG SiX, Prism Sound Dream ADA-128, anything from Qes Lab, JCF, Burl and Linn, iZ RADAR, Avid HD OMNI, Cranborne Audio 500R8, Fractal Audio Systems Axe-Fx III, NEVE MBC, Sound Blaster X7, Focusrite ISA 428, Elektron Octatrack MKII , Burl B2 Bomber ADC ---> DAC, dCS, Antelope Amari, Black Lion mods (e.g. Apollo X mods), Lynx Hilo 2, new (2024) MOTU 828, Forssell MDAC-2 ---> MSB Studio ADC as master, Solid State Logic SSL 18. Of course any other one welcome!

Presonus DP88 was synced to Presonus Studio 192.

Links:

Audio Alchemy DDE v1.0 => Presonus Studio 192
- - - - - Review of AA DDE from 1991 - - - - -
(Added just for fun)

Fostex VC8 (0dB)

Fostex VC8 (-6dB)

Metric Halo LIO 3D

Metric Halo LIO 3D (-6dB)

Metric Halo 2882 3D

Metric Halo 2882 3D (-6dB)

Metric Halo 2882 3D (-12dB)

Mackie Onyx 1200F
- Sync => MH LIO 3D (ADAT)

Mackie Onyx 1200F (-6dB)
- Sync => MH LIO 3D (ADAT)

Links:

Mackie Onyx 1200F internal sync

Mackie Onyx 1200F internal sync (-6dB)

-126.824451 ms, 6.0010 dB (L), 6.0829 dB (R), -38.5593 dBFS (L), -39.9464 dBFS (R)

After removal of 1 sample L vs R shift: -1.571831 ms, 0.4037 dB (L), 0.4013 dB (R), -44.9789 dBFS (L), -46.2464 dBFS (R)

After removal of 1 sample L vs R shift: -1.571828 ms, 6.3262 dB (L), 6.3237 dB (R), -44.9802 dBFS (L), -46.2475 dBFS (R)

-2.662010 ms, 0.8934 dB (L), 0.9895 dB (R), -56.7922 dBFS (L), -58.1647 dBFS (R)

-2.662007 ms, 5.8079 dB (L), 5.9044 dB (R), -56.7924 dBFS (L), -58.1639 dBFS (R)

-1.677334 ms, 0.5412 dB (L), 0.5481 dB (R), -33.9306 dBFS (L), -35.2546 dBFS (L)

-1.677320 ms, 6.3616 dB (L), 6.3683 dB (R), -33.9303 dBFS (L), -35.2541 dBFS (L)

-4.567837 ms, 0.5914 dB (L), 0.6695 dB (R), -44.3444 dBFS (L), -45.4419 dBFS (R)

-4.567836 ms, 6.3916 dB (L), 6.4697 dB (R), -44.3444 dBFS (L), -45.4416 dBFS (R)

To be added to the next issue of the list of the results.

-1.677439, 9.6129 dB (L), 9.6219 dB (R), -33.9305 dBFS (L), -35.2542 dBFS (R)
-12 db or -9 dB gain ?

-4.568543 ms, 6.1585 dB (L), 6.2335 dB (R), -44.3364 dBFS (L), -45.4304 dBFS (R)

-4.568543 ms, 6.1585 dB (L), 6.2335 (R), -44.3364 dBFS (L), -45.4304 dBFS (R)

Mackie Onyx 1200F#01.wav and Mackie Onyx 1200F#01 (-6dB).wav have the same audio contents.

For previous MOtu Ultralite Mk5 results, I don't know if they used front or rear inputs.
I have recorded both. And SSL 2+ Mk2 below (not very good measurements either sadly)

Motu Ultralite Mk5 - Front mic input, rear TRS outpout:
https://drive.google.com/file/d/1WHL...ew?usp=sharing

Motu Ultralite Mk5 - Rear line input, rear TRS outpout:
https://drive.google.com/file/d/1QMt...ew?usp=sharing

SSL 2+ Mk2:
https://drive.google.com/file/d/1bwA...ew?usp=sharing

-151.499596 ms, 0.9001 dB (L), 0.9200 dB (R), -41.5614 dBFS (L), -42.7636 dBFS (R)

-151.599801 ms, 4.2705 dB (L), 4.2689 dB (R), -46.6106 dBFS (L), -47.5559 dBFS (R)

-156.229592 ms, 0.9030 dB (L), 0.8875 dB (R), -39.9289 dBFS (L), -41.3241 dBFS (R)

To be added to the next issue of the list of the results.

Focusrite 4i4 3rd Gen - TRS output to XLR mic inputs:

https://drive.google.com/file/d/1mq6...ew?usp=sharing

-153.828330 ms, 1.0323 dB (L), 0.8928 dB (R), -40.5218 dBFS (L), -41.2227 dBFS (R)

To be added to the next issue of the list of the results.

RME Fireface 802

https://drive.google.com/file/d/1uKs...ew?usp=sharing

Audient iD14 Mk2 - fixed google link for everyone to access. TRS out to mic input.

https://drive.google.com/file/d/1N4-...ew?usp=sharing

-59.684 µs, 0.2556 dB (L), 0.1891 dB (R), -45.9615 dBFS (L), -47.1132 dBFS (R)

To be added to the next issue of the list of the results.

-153.946082 ms, 1.2097 dB (L), 1.3295 dB (R), -39.6868 dBFS (L), -40.9027 dBFS (R)

To be added to the next issue of the list of the results.

Antelope Audio Zen Quadro - rear line out TRS to front mic XLR input

https://drive.google.com/file/d/1WWM...ew?usp=sharing

It is a 44.1 kHz 64 bit mono recording. Please could you provide the same in 44.1 kHz 24 bit stereo format ?

Ok this is the first time I used @ pkane DeltaWave to do the recording.

Is it possible pkane to record directly to 24bit 44.1kHz ?

not sure if my tag in post above worked.

Can I use DW to record direct to 24bit? Seems it came out as 64-bit