The OT, just like any converter out there, WILL change the sound of your source material. Whether everyone can hear it or not, is not the issue. When 2 people come on here and say they can’t hear a difference (in fact they said they could), it’s not a conclusive test.
Furthermore, some people have ears that are trained to hear minute differences in frequency. I don’t know many people who can hear a 2db boost at 1khz, but the big mixing engineers in the world certainly can.
What I’m suggesting :
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A/B tests are not the definitive answer, as we’re relying on people’s ears, feelings, expectations and experience while comparing.
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not everyone’s ears are trained to detect minor differences in sound, ESPECIALLY when doing a blind test.
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people are not necessarily honest during blind tests, they each have their own expectations and have, usually, already arrived at a conclusion before even starting the test.
What IS sure, is that the OT applies some heavy compression on the output, past a certain point. It’s some kind of limiting/overdriving that is VERY apparent when pushing levels a bit too hot. This, indeed, results in a squashed, flat sound, which the OT is infamous for. Sure, this has to do with gain staging, BUT, some other instruments out there don’t flatten the sound when overdriven. The OT does.
I think most people’s complaints are because there is no way to monitor levels in Electron kit, except for the input lights, which flicker red long before the inputs are actually distorting.
In conclusion, any attempt at A/B 'ing the OT and a pure source, is somewhat compromised by the fact that the gain structure of the OT is multi staged and not informative. Furthermore, and as it has been pointed out already, the kind of material you A/B has a massive influence on the results.
I wouldn’t get all excited about it. Every single professional around me hears a noticeable difference when running kit through the OT or straight in the board. This may have to do with gain staging, but since we don’t actually know what is “perfect” gain staging, it’s pointless to obsess about it.
The real question is if you like the sound of your kit running through the OT, or not. Personally, I use it as an FX unit, so i do. But I would not run my main elements through it, not necessarily because of the degraded sound fidelity, but simply because i want a signal as clean as possible.
Cheers