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Ultralite MK3 main out/headphones distortion

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Discussion related to installation, configuration and use of MOTU hardware such as MIDI interfaces, audio interfaces, etc. for Mac OSX

Ultralite MK3 main out/headphones distortion

Postby jitter » Mon Mar 04, 2013 1:03 pm

Hi all!

I've bought Motu UltraLite MK3 and found that:
1. Sound from MAIN OUT and HEADPHONES completely DIFFERENT than from direct outs 1-8
(main and phones has "screaming" middles and looks like analog distortion in output opamps) :cry:
2. MAIN OUT louder than ANY Direct OUT by +2.2 dB
3. I've tested bus powered and AC powered configuration - the same.
4. Direct outs sounds perfectly.

Does anybody, who has UltraLite MK3, can compare sound from main outs and direct outs?
(and measure output level from direct and )

P.S. I own an old MOTU 828MK2. It hasn't any problems - all outs and phones sounds perfectly.
jitter
 
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Joined: Mon Mar 04, 2013 12:44 pm
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Re: Ultralite MK3 main out/headphones distortion

Postby crduval » Mon Mar 04, 2013 2:17 pm

You should check your cuemix settings and make sure your levels, mixes and EQ settings are set up properly. I have an ultralite an the only tomes i get strange output is when I've inadvertently cranked my virtual output knob in Curmix. Hope this helps!


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Mac Pro 2x3GHz dual core, 8GB RAM, OS X 10.7.3, DP 7.24, MOTU MX-4, MOTU M5v3, EWQLSO Gold, EWQL Pianos, Kontakt & Kore players + various samples, HAlion Sonic, UAD-2 Duo Neve bundle + other plugs, MOTU Ultralite mk3, MOTU micro express, K2500XS, some pretty good mics, a few cool guitars and amps, a bass and a tolerant family.
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Re: Ultralite MK3 main out/headphones distortion

Postby jitter » Mon Mar 04, 2013 2:42 pm

Thank you, but:

1. I've double checked CueMix console - nothing.
2. I use ProTools software to drive ULite outputs separately, without cuemix

Could you measure Main output level compare Direct output level ?
jitter
 
Posts: 3
Joined: Mon Mar 04, 2013 12:44 pm
Primary DAW OS: MacOS

Re: Ultralite MK3 main out/headphones distortion

Postby 4stripes » Mon Mar 04, 2013 6:59 pm

You are correct, I've also measured that the main outs are 2 dB louder than the direct outs (+19.5 dBu vs +17.5 dBu). This seems to be by design.

The main outs and phones use the AKM4382AT DAC and a different op amp than the line outs.

The line outs use the AKM4358VQ 8-ch DAC and 4580 op amps.

I have not been unhappy with the sound (through Genelec 8040A), but I have not compared the main outs to the line outs.
4stripes
 
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Re: Ultralite MK3 main out/headphones distortion

Postby jitter » Mon Mar 04, 2013 9:16 pm

Yes, i've opened it. And looks the same:

1. You are right, headphone and main out uses separate D/A converters (stereo AK4382) instead of directs 8 ch AK4358.
2. Main and Phones uses completely different analog part, BUT the sound from them identically bad. Can't believe, that AKM produce such bad converters. I'd like to measure spectral and distortion from converters itself and from motu outs

P.S. Let's listen music with more middles (like an old school guitar rock music) main out and direct out, I think you will be surprized.
jitter
 
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Joined: Mon Mar 04, 2013 12:44 pm
Primary DAW OS: MacOS


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