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Benchmark comparison of Radial PRO D2 and ART DTI


JeffLearman

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Just in case anyone cares, I recently benchmarked my two DI boxes, using Rightmark Audio Analyzer (a nifty software tool).

 

To do the test, I patched analog outputs on my MOTO 828 to the DI box, and from the DI box to analog inputs on the MOTU. The graphs here show 3 results: the MOTU by itself, and then one for the MOTU plus each DI box. (For the Radial, I used the MOTU's mic inputs. For the ATI, I had to use the line inputs because lack of pad caused clipping on the mic inputs.)

 

My idea was to compare the Radial transformers with what I thought would be a typical passive DI box. As it turns out, the ART DTI isn't exactly typical, since it's a 1:1 unit -- it doesn't have the 20dB reduction that most DI boxes have. (It also doesn't have a ground lift and additional pad that most DI boxes have, which is why I got the Radial.)

 

Still, it might be fairly close to being representative. As it turns out, the differences are notable, but less significant than I'd have guessed. In an audio A/B comparison using my usual wireless headphones, I couldn't tell the two apart, but I should probably try again with better headphones.

 

From the looks of it, the PRO DI is nearly as good as the MOTU. No doubt in some respects it's better, and the graphs can't possibly show that since they'll reflect the weakest link.

 

http://learjeff.net/RMAA/MOTU%20828,%20Radial%20PRO%20D2,%20ART%20DTI.htm

 

Summary

 

Test                           MOTU 828       MOTU 828 +      MOTU 828 +
                                             Radial PRO D2   ART DTI 
Frequency response
(from 40 Hz to 15 kHz), dB:    +0.03, -0.05   +0.03, -0.09    +0.05, -0.45 

Noise level, dB (A):           -102.2         -101.8          -100.6 
Dynamic range, dB (A):          102.1          101.5           100.3 
THD, %:                         0.0014         0.0018          0.018 
IMD + Noise, %:                 0.0030         0.0095          0.232 
Stereo crosstalk, dB:          -100.7         -98.0           -97.2 

 

 

Frequency response

http://learjeff.net/RMAA/MOTU%20828,%20Radial%20PRO%20D2,%20ART%20DTI/fr.png

 

Noise level

http://learjeff.net/RMAA/MOTU%20828,%20Radial%20PRO%20D2,%20ART%20DTI/ns.png

 

Dynamic range

http://learjeff.net/RMAA/MOTU%20828,%20Radial%20PRO%20D2,%20ART%20DTI/dr.png

 

THD + Noise (at -3 dB FS)

http://learjeff.net/RMAA/MOTU%20828,%20Radial%20PRO%20D2,%20ART%20DTI/thd.png

 

Intermodulation distortion

http://learjeff.net/RMAA/MOTU%20828,%20Radial%20PRO%20D2,%20ART%20DTI/imd.png

 

Stereo crosstalk

http://learjeff.net/RMAA/MOTU%20828,%20Radial%20PRO%20D2,%20ART%20DTI/ct.png

 

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Thanks for that. I have never done a comparison. Interesting reading.

 

All I know is my Radial ProD2 is 8 years old and is as solid as a tank, and works flawlessly.

 

+1.

 

I've had a Radial ProD2 for a few years; wish I'd picked one up years earlier.

 

Thanks as well, LJ, for the comparison homework; interesting graphs. The ART piece looks to be a capable device, too. :thu:

'Someday, we'll look back on these days and laugh; likely a maniacal laugh from our padded cells, but a laugh nonetheless' - Mr. Boffo.

 

We need a barfing cat emoticon!

 

 

 

 

 

 

 

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It weighs about as much as a tank, too!

 

YW. Too bad the ART doesn't have a ground-connect option (it's always lifted.) I'm thinking of adding one, but can't figure out where to put the switch. Very little wasted space on that one.

 

I like the fact that the ART DTI has all three conector types (RCA, 1/4" TRS, XLR) on both input and output sides. I've used that a number of times in odd situations.

 

I've also been using the RCA inputs and having problems, and after investigating, I think the answer is "do not use the RCA inputs". It's better to put a RCA-to-1/4" TS adaptor plug in the 1/4" input and use that, if I need to use the RCA outputs on my mixer.

 

It's also nice that the DTI handles either unbalanced TS or balanced TRS, for either input or output.

 

Here's a schematic:

http://www.dmmusic.com/media/catalog/product/cache/1/image/650x650/9df78eab33525d08d6e5fb8d27136e95/a/r/art_dti_1.jpg

As it turns out, there is no "external ground lug".

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