What's your room response?

you can't really tune basstraps - you can tune helmholz absorbers but if you get it wrong it messes EVERYTHING up so i wouldn't bother (plus they need to be gigantic). just put in loads of 4"-6" thick broadband absorbers at the first reflection points (sides, back) and the corners, and try and test with an omni mic.

Interesting topic but let me ask you something: Is that response constant in all places 'cause acoustic tells me it couldn't be constant. Once I had an idea to make a recording in a calm day at a desert like Gobby or Sahara. The only reflections you've got is form the sand-floor. Put aside the fact that there is no electricity for a moment. So maybe there if you make a wide, wide flat sand-plateu there the FR or IR could be constant. In fact it irrelevant where are you and your mic together. In every closed stuido-room or whatever FR is not constant so i use haedphones all the time and now thinking of doing only binaural recordings and mixing. It's a whole new universe of recording and mixing.

Here's mine, Samson Resolv65a speakers, Behringer omni condenser mic positioned in 'sweet spot'. Speakers on cinder blocks on concrete floor (basement). Barnwood wall covering. No acoustic treatments.

No treatment? I don't believe it. I would be very curious to see a waterfall plot of 250 and below. As for the original post... cardioid is a no-no. Proximity effect (or lack of) directional pick up, etc etc make cardioids quite unsuitable for room measurement.

Room EQ Wizard: As for a mic, the Radio Shack SPL meters are OK for SPL measurement, but are kinda cruddy for actual frequency measurement via their mic output port. Frankly, even the cheapo Behringer measurement mics are plenty accurate for these purposes. As for the measurement place... of course you will want to measure from where you will be listening. You may want to take measurements else where if you have a reason to... but listening position is the most critical place for hopefully obvious reasons.

The confusion comes from the fact that the Radio Shack meter can also work as a measurement mic... though it does a poor job at this when compared to mics specifically suited to the task. What RoomEQ wizard asks for is an SPL meter to calibrate against, not necessarily to do the actual spectral measurement with.

Wow those graphs are pretty revealing! Thanks for all of the info, everyone. I'll post a new response graph when I get set up.

Keep in mind those are all relative graphs in relation to a room measurement. His point is to have the Josephson be a base line of "truth". Any variation from the Josephson is "inaccuracy". So yeah, there is a huge dip at ~175Hz. That is the ROOM, not the mic. The Josephson should be more or less ruler flat in a perfect environment. Just making sure that is clear.

I'm sorry d.bop, I didn't realize the radio shack SPL meter had a mic connector output. Mine's pretty old and doesn't have one, at least I don't think it does heh heh haven't used it for a while.:rolleyes: Still I'm not sure I would trust it.

Working on Room EQ Wizard now... loopbacks and such. I may not get it tonight because it's a lot for my limited caveman brain to comprehend. BTW - my mic is a Behringer BCM8000 omni, as I understand it that's a pretty good reference mic. The SP meter is an ExTech #407730