In room close mic measurement, how close?? - AVS Forum
DIY Speakers and Subs > In room close mic measurement, how close??
randyc1's Avatar randyc1 01:18 PM 01-08-2013
If i want to test my sub's Freq responce in room Without the effects of the room , how close should i be to the driver ??

tuxedocivic's Avatar tuxedocivic 01:22 PM 01-08-2013
Put the driver in the middle of the room. Raise it up if possible. Put the mic a couple inches from the dust cap. Sweep. Pull the mic back to about 6". Sweep. Keep doing that until you see the room. Probably can't get out past 6" unless your sub is well away from boundaries.

Turn it up as much as feasible once you've found that threshold which won't be to loud or you'll clip the mic or something in the system.
Stereodude's Avatar Stereodude 02:11 PM 01-08-2013
Is this a sealed sub or a ported sub?
randyc1's Avatar randyc1 11:27 AM 01-09-2013
Its a ported sub, front firing driver and port .
tuxedocivic's Avatar tuxedocivic 11:43 AM 01-09-2013
Ah, good question Stereodude. I didn't think about that.

Randy, that's a little tricker. I would try by putting the speaker in the middle of the room and place it on the floor. Get the driver and port close to the floor. What size of driver? And how far away is the port? I'd then put the mic about 12 to 18" midway between the woofer and the port and lay the mic on the floor. Sweep. See how that looks. That will have captured the driver and port all in one. If the room influences the response, then raise the speaker up off the floor, put the mic 1" away from the center of the woofer. Sweep. Then right at the port. Sweep. Then hopefully your software will have a "match" and "stitch" function. Maybe do both ways, even if the further mic position works. That way you'll see the two separate outputs. Kind of depends what you're trying to do.
randyc1's Avatar randyc1 11:31 AM 01-10-2013
My sub has 12'' driver
tuxedocivic's Avatar tuxedocivic 04:24 PM 01-10-2013
I'd try 12" away and try and capture both port and driver outputs at the same time. Unless you need to see the difference. You should be able to manage if you can get out in the room.
randyc1's Avatar randyc1 12:51 PM 01-11-2013
Allright thanks guys!!
Mobile  Desktop