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Audio Technical AT2020 USB Help
Hello gurus, I’m recording vocals with the AT2020 in BM3 and for my inputs it has 1+2, 1, 2. Which one should I use for spoken word vocals?
Comments
It's not going to matter. The mic is a mono source presenting a stereo left/right input to iOS. The stereo source is just going to be two channels of the same thing mixed together, while the 1 and 2 are just going to be one channel. But it'll all be the same thing.
At least ... that's how it's been for any other interface I've used with a single input that outputs 1+2, 1, and 2 like yours does.
There's a chance that the 1+2 will have a higher signal level, in which case, you probably want to use that. But I doubt it.
It's the same deal with my iRig Mic HD.
One thing that is quite funny here is that on the iRig Mic HD the 'channels' 1 & 2 are not in 100% sample-sync.
I've not checked the accuracy but there's like ~1-4 sample difference between L & R channels.
This also makes the 'stereo recording' sound a bit wider than it theoretically should be due to the micro delay
If I record inputs 1 & 2 (Stereo) and phase invert one of the channels and 'convert to mono'(Mix) I should theoretically get a perfect flat-line (all 0's) but curiously enough if I normalize the mono mix I get a 'lo-fi' version of the recording caused by the channel sample-offset in the original 'stereo' recording.
So my suggestion is to use 1 or 2 (Mono) and avoid the 1 & 2 (Stereo) to avoid phase-issues later on when processing the recording and you save space by recording just one channel instead of two.
In these scenarios I always use input 1. Sometimes using 1+2 will result an ‘empty’ channel 2 which can add an unnecessary step to working with the track.
Thanks for the fast response, I’ll check for level differences and if significant, will use 1+2 only if micro delay is not present.
I was going to ask a follow up because I had a slight static fuzz in my cans, checked all* tracks for audio fx that have caused this in the past (DAW Cassette), checked my settings, cpu %, force quit BM3, restarted iPad, checked same loops in other app, no static. After driving myself nuts, I checked the main channel (*didn’t do that when I checked the individual tracks because... dumb!) and for God only knows, I had inserted RX950 on it which is great for producing a slight static fuzz!
That's good info about the phasing @Samu. I'll have to check that on my old iRig HD. I've only ever casually listened for the difference between the combined and separate inputs.
As for space saving from using one or the other, it depends on the DAW. Some DAWs record a stereo file whether or not there's a mono input.
Yeah, AUM always records 'stereo' even when just one channel is selected.
Cubasis 3 can record mono but 'freezes' mono -> stereo.
Koala records stereo but has a mono convert function with select L/R/Mix.
BM3 records mono with one channel selected.
Most of the time I use the iRig Mic HD or iRig Mic Field with my iPhone 8 when I need a bit better quality than the built-in one.
(I have to record 'by numbers' without monitoring since the iPhone 8 doesn't have a head-phone jack, arghhhhh).