Mid Sides recording with OC818
Posted: Fri Feb 21, 2020 4:49 pm
Is it overkill to record both sides of the OC818 when used as a side mic, or would you just record the main feed and double it in the DAW (as with a normal fig 8 mic)?
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Hugh Robjohns wrote:To use the OC818 as a Side mic in an MS array it has to have a sideways-facing fig-8 polar response -- nothing else will do -- and you can only get that by combining it's two cardioid capsules together at equal level and in opposite polarities. No other combination is acceptable in that role.
So, seeing as the mic can do that combination job perfectly for itself... why waste tracks and effort in recording the capsules separately just to recombine them to allow use as a fig-8 sides mic? It's not like you could do anything else with the two outputs in that application!
Sam Spoons wrote:I can't see any advantage if it is for M/S. There benefit of recording the two separately is that you can alter the effective polar pattern in post production. For M/S you need a fig 8 for the sides component, nothing else will do so you would not be changing the virtual polar after the fact just the mix of M and S as with a 'normal' M/S recording.
jodaki wrote:If the 2 opposite cardiod signals listening left and right were kept separate and each recorded to a separate track, wouldn't that give a better stereo field than summing them to mono and duplicating that track (or using a software decoder), seeing as in the latter case each side channel would contain the same information?
I get that this wouldn't be MS recording anymore but wouldn't the effect be a sort of improved MS?
jodaki wrote:If the fig 8 mic is capturing a mono signal, how can that be expanded through decoding to equate to being exactly the same as two mics recording left and right separately?
If a cello is on my right and the bass on my left. How can a summed mono fig 8 mic...
They'll just get summed by the mic and split and panned but the relative (volume and ambient) differences get lost.
Hugh Robjohns wrote: -- and Voxengo's MSED does it all perfectly and for free:
MS array into a stereo track (mid on the left, sides on the right), drop in MSED, select the decode mode, adjust S level to taste. Job done.
jodaki wrote:Im really sorry Hugh, you've answered my question already and I accept what you've said as being the right way to do it but I still don't understand one thing...
If the fig 8 mic is capturing a mono signal, how can that be expanded through decoding to equate to being exactly the same as two mics recording left and right separately?
If a cello is on my right and the bass on my left. How can a summed mono fig 8 mic reflect the balance differences coming from the right and left from the bass and cello? They'll just get summed by the mic and split and panned but the relative (volume and ambient) differences get lost.
Im struggling to see how a summed mono signal can be decoded to equate to recording both sides independently, because the summed mono signal is ignorant of the differences between the left and right signals.
Hugh Robjohns wrote:You appear to be forgetting the importance of the opposite polarity lobes...
jodaki wrote:Hugh Robjohns wrote:You appear to be forgetting the importance of the opposite polarity lobes...
Very generous, it was more a lack of understanding than remembering. Thanks for your patience, I get it now. Fascinating and ingenious... J