At 11/27/07 10:57 PM, Adam-Beilgard wrote:
So here's where I stand:
Trying to capture an acoustic instrument live either produces too much hum or a distant sound (like I'm in a large room, and I'm not). I can't seem to get a clean sound no matter what I do, pre or post-production.
I use Behringer B-2 Pro condenser mics on the cardiod setting hooked up to a Behringer Eurorack MX802A soundboard running directly to my soundcard (via mic jack). Cakewalk is my multi-track.
You didn't say what kind of instrument you're recording, so I'm assuming that you're using a crossed pair or spaced stereo pair and ambient recording a room.
One of the big problems about ambient recording is background noise. Condenser mics are actually more sensitive than the human ears when it comes to decibel levels, partly due to the way they're made, and also due to the fact that our heads have their own built in compressor meaning we ignore quiet noises and amplify the ones we expect to hear.
Higher frequencies travel further than lower frequencies. Basically this means that once you start moving your mic away from the sound source, you're going to start loosing frequencies from the bottom end first. In situations where there is a lot of bassyness at high amplitude (i.e. electronic guitar bands with amplified bass guitars) this isn't normally that much of a problem, but bass rolloff causes big issues with acoustic instruments.
You could try increasing the gain - this would effect the sensitivity of the mic so the lower ferquencies stand out more, but that also amplifies the higher once. A compressor might do the trick if you run it through the EQ first, but my personal motto is 'If you can't get a good sound without post production, you need to rethink your recording method'.
For example, if you were recording piano, have a crossed pair right in the centre of the piano, facing outwards with a 90 degree angle between them (that's 45 off vertical normal). Open up the lid and drop them right in there so that they're about 15cm above the hammers. Keep the gain low on the desk, then give it a whil, and you should get some lovely, crisp piano sounds with a defined bass.
For acoustic guitar, you'll want a single close mic. There are several positions you can put it, though generally the mic has to be within 5-10cm off the strings. Point it directly at the fretboard for a more fretty sound, or point it at the fingers to get a more strummed sound.
If you're restricted to ambient micing, you might want to consider buying a low-frequency mic like the
d112, and place it closest to the bass output of the instrument (left side of a upright piano, directly under a grand piano, top left side of a guitar pointing at the hole). This will give your recordings a bass boost which you can control using your desk.
Good luck!