Hi,
I purchased a Joe Meek 1Q channelstrip a while ago and it came with an LDC to my surprise. The JM37DP. The mic has a -20/-10/0 pad switch and an omni/cardioid switch. It is sort of short and fat in shape.
I wasn't aware that the preamp included a mic so I was happy to have another mic to add to my closet. Even if I didn't really have a particular need for it. Once I received the preamp I went in and tested it out to make sure it passed signal with all my mics and confirmed that all of the eq bands, compressor, etc worked as expected.
That was all fine.
I also checked the mic through my other pre's. UALA610's, API, spirit digital console pre's, etc... Everything was as expected.
Just this morning I received a DBX 376 channelstrip and started to go through the same tests to confirm everything was ok. The mic I had right next to me was the JM37DMP so I started the tests with that mic...
With phantom engaged on the 376 the JM37DMP started thumping... Thump... Thump.... Thump..... over and over... No useable signal....
I thought that was strange so I tested a couple other mic's... Both condensers and dynamics... Some 421's, U89, 57, NT1's, D112.. And they were all fine going through the DBX.
Back to the JM37P through the DBX and the same thing.. However, when I engage the pad (-20) on the DBX the thumping goes away and I can get audio out of that mic. Changing the pad on the mic didn't do anything.
So, I tried the JM37P again through my other pre's and it's fine...
I took the mic apart and there were no obvious bad connections. Looked inside the DBX and it looked fine too.
My first thoughts are that this is some sort of issue with the phantom supply and that mic in particular. Like it's pulling too much current for some reason or another. None of the other mic's appear to have the problem though and I wouldn't think that the current requirements would be that demanding or that the DBX would not normally have adequate current available.
I would like to figure out which is the source of the problem and fix it if anyone has any ideas.
I don't find the JM37P particularly useful but since I have it it would be nice to have the option to use it with the DBX pre for when I do go to put it up on a session...
Any thoughts?
Thanks in advance,
j