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OM1 - What's it about?
Old 22nd June 2021 | Show parent
  #631
Here for the gear
 
🎧 5 years
Merci !
There is too much piano, and the violin should be more present, I'll try different mics position.
I'm afraid I don't have any bigger room in my apartment
It's 7.7m x 4.2m, 3,7m height 25x14x12'), but there are few furniture in that room, so it's pretty reverberant.
Maybe moving some bookshelves we have in this room, and then add some basstraps would help ?
Old 22nd June 2021 | Show parent
  #632
Lives for gear
 
🎧 10 years
Quote:
Originally Posted by zoloo ➡️
Merci !
There is too much piano, and the violin should be more present, I'll try different mics position.
I'm afraid I don't have any bigger room in my apartment
It's 7.7m x 4.2m, 3,7m height 25x14x12'), but there are few furniture in that room, so it's pretty reverberant.
Maybe moving some bookshelves we have in this room, and then add some basstraps would help ?
With omnis, you wil not avoid the acoustic of small room of your room. The walls are too close.
Then all depends of what you want to do with your recordings. It's allright until you want to make real recordings for broadcast or CDs and because today we have others listening customs for classical music.
Old 22nd June 2021 | Show parent
  #633
Here for the gear
 
🎧 5 years
Thanks again for the answer.
The only purpose of the recording is to keep a track of the different pieces of music they play.
They are pure amateurs, so no CD on sight
For me, the motivation is to get better at recording

Maybe I'll try to close mic the piano on tail with the omni, and add a pair of cardioids for the violin
Old 22nd June 2021 | Show parent
  #634
Lives for gear
 
🎧 10 years
Quote:
Originally Posted by zoloo ➡️
Maybe I'll try to close mic the piano on tail with the omni, and add a pair of cardioids for the violin
I love the OM1 on violin and in general daesn't like cardios on violin.
Myself I would close mic de violin with the OM1. They will also capture the basses of the piano. I would add the cards on the piano.
Old 22nd June 2021 | Show parent
  #635
Here for the gear
 
Quote:
Originally Posted by jamesmafyew ➡️
I have found the Line Audio mics to be more sensitive to EMI (not RFI, just AC line harmonics) than other small-diaphragm mics in my collection. It's only noticeable in proximity to strong magnetic fields, so it won't be a problem everywhere. But, take care not to position the mics near HVAC equipment, dimmer circuits, power distribution, or AC power cords with high-current loads on them. The problem is also much more noticeable in older buildings with poor electrical wiring (usually open grounds).

The attached image is a level-matched comparison of the SE8 Omni and the OM1 both inside a large foam block, inside an iso cabinet, recording just the 'silence'. Each was run with the same type/length of Mogami 2534 cable into adjacent channels of a Sytek MPX-4Aii. Both pick up the room's HVAC rumble very accurately, but it's also easy to see the EMI harmonics picked up by the OM1 (this is NOT acoustic noise, this is electrical interference) that are not present in the SE8 omni (and it's easy to hear them, too, listening to the files). This particular room is in a pretty bad EMI environment, in a building next to a commuter rail line that uses 700VAC power and regenerative braking systems.
Try to send this to Roger directly. It looks like issue.
Old 23rd June 2021 | Show parent
  #636
Lives for gear
 
🎧 10 years
Quote:
Originally Posted by beefheart ➡️
Try to send this to Roger directly. It looks like issue.
It can also depend on whether pin 1 inside the xlr connector is attached to the outer shell or not. If it’s not it can be worth soldering a small bridging wire and see if this improves or makes it worse. Also try disconnecting the shield at one end of the xlr cable
Old 24th June 2021 | Show parent
  #637
Gear Head
 
Quote:
Originally Posted by studer58 ➡️
It can also depend on whether pin 1 inside the xlr connector is attached to the outer shell or not. If it’s not it can be worth soldering a small bridging wire and see if this improves or makes it worse. Also try disconnecting the shield at one end of the xlr cable
I've checked them out and they're fine, good continuity between pin 1 and chassis. I have lots of OM1s and CM4s and they all exhibit this behavior, so I doubt it's a defect. The above example is a particularly bad EMI/RFI environment.
Old 2 weeks ago | Show parent
  #638
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emrr's Avatar
 
24 Reviews written
🎧 10 years
Quote:
Originally Posted by jamesmafyew ➡️
Each was run with the same type/length of Mogami 2534 cable into adjacent channels of a Sytek MPX-4Aii. Both pick up the room's HVAC rumble very accurately, but it's also easy to see the EMI harmonics picked up by the OM1 (this is NOT acoustic noise, this is electrical interference) that are not present in the SE8 omni (and it's easy to hear them, too, listening to the files).
Maybe out in the weeds, but every Sytek I've looked at shows increasing power harmonics from channel 1 to channel 4. 1-2 usually pretty close, but a little diff, a lot in channel 4. Factor that in FWIW.
Old 2 weeks ago | Show parent
  #639
Gear Head
 
Quote:
Originally Posted by emrr ➡️
Maybe out in the weeds, but every Sytek I've looked at shows increasing power harmonics from channel 1 to channel 4. 1-2 usually pretty close, but a little diff, a lot in channel 4. Factor that in FWIW.
In which case, the SE8 should show more, since it was on channel 2 while the OM1 was on channel 1. But these harmonics are way, way higher than anything produced by this preamp, which I've tested (all channels) with a 150-ohm dummy load on the inputs.
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