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Old 29th April 2007, 04:00 AM   #1
Geoff H is offline Geoff H  Australia
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Default Mic stands for FR etc

Hi all. I have been frustrated getting consistent results using a rat shack SPL meter. I have tracked the problem down to the photographic tripod I've been using. Depends on how far the legs are retracted, how high the centre post is raised etc.

Before I build a non resonant stand, I am open ears for suggestions.

Thanks in advance.

Geoff.
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Old 29th April 2007, 04:24 AM   #2
Foxx510 is offline Foxx510  Australia
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I wonder if the angled legs are causing the reflections. I'd be going for a straight, thin round pole with a heavy round base. Maybe even wrap the pole in a felt or simlar fabric. You could try wrapping your current setup in a soft thick fabric and see if that helps also. An isolation mount made from elastic might also be worth trying on the meter to decouple it from the stand.
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Old 29th April 2007, 04:38 AM   #3
imix500 is offline imix500  United States
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When we measure a room/system with Meyer's SIM3, we just use the standard K&M 201. It more often is any object near the stand that causes problems with reflections. But of course, you can see them on SIM.
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Old 29th April 2007, 05:29 AM   #4
Geoff H is offline Geoff H  Australia
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Thanks guys.

Sounds like a monopole is the way to go. 3 legs of aluminium tube is not exactly anti-resonant. It helps if I grasp the centre pole, but then I'm in the way, and still have to reach the mouse, and I haven't calibrated the grip.

The rubber decoupling sounds like a good idea. Works on tone arms. Some mass between it and the meter or mic may help. I'm on a concrete slab, so at least I don't have to worry about floor vibrations.

Regards,
Geoff
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Old 29th April 2007, 05:36 AM   #5
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I got a mic stand at the music store, a Euroboom, I think. It was cheap. Three small legs at the bottom, a vertical post, and an adjustable horizontal boom. I use it for supporting all kinds of things (like photo lights), but it makes a pretty good mic stand as well.
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Old 29th April 2007, 05:36 AM   #6
OzMikeH is offline OzMikeH  Australia
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Old photographer's trick with cheap tripods:
hang a weight (usually the camera bag) from the bottom of the tripod to pre-load the legs. kick the feet outward slightly.
adjust the height with the legs, use the largest sections first. Winding the column up is a last resort.

is your floor wood or concrete? You're in big trouble if it's wood.

Isolation mount would be a good idea.

Edit:
How about the low tech solution: get a friend to sit in a chair and hold it out at arm's length?
or if your hands shake too much, stick it to a hat somehow. Make sure you send pictures.
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Old 29th April 2007, 06:17 AM   #7
Foxx510 is offline Foxx510  Australia
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Lots of good ideas for shockmounts here
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