I posted a larger version of this in the DEQX thread as there were specific DEQX questions, but I've cut out the general questions and re-posted them here - apologies for any double up but I think the DEQX forum has many cobwebs:
Normally I do my measurements outdoors with the speaker elevated 2m off the ground facing up, with the mic 1m above.
That setup provides the most distance between the direct sound and the first reflection.
My planned mid woofers, for use between 50Hz and 300Hz will be very heavy, so lifting them high off the ground to perform measurements is really not an option (safely), 1m off the ground would be OK, but ground plane easier again.
The planned tapped horn will operate between 25 and 50Hz, and also be heavy and unwieldy, so again either 1 m off the ground or ground plane measurements will be done.
Q1) Given the ground bounce will be the first reflection, and very soon after the direct sound, is there benefit from measuring outdoors?
Is having the ground bounce the only reflection better than lots of reflections soon after the ground bounce for meaningful results?
Q2) is close micing recommended? Since I'm not measuring a multi way speaker there's no requirement to have the Mic 1-2 m away and could have the mic 20mm off the driver for the mid bass and right at the horn mouth for the tapped horn?
Key goal is to measure Frequency Response, Phase, Group Delay, distortion
Cheers
Mike
Normally I do my measurements outdoors with the speaker elevated 2m off the ground facing up, with the mic 1m above.
That setup provides the most distance between the direct sound and the first reflection.
My planned mid woofers, for use between 50Hz and 300Hz will be very heavy, so lifting them high off the ground to perform measurements is really not an option (safely), 1m off the ground would be OK, but ground plane easier again.
The planned tapped horn will operate between 25 and 50Hz, and also be heavy and unwieldy, so again either 1 m off the ground or ground plane measurements will be done.
Q1) Given the ground bounce will be the first reflection, and very soon after the direct sound, is there benefit from measuring outdoors?
Is having the ground bounce the only reflection better than lots of reflections soon after the ground bounce for meaningful results?
Q2) is close micing recommended? Since I'm not measuring a multi way speaker there's no requirement to have the Mic 1-2 m away and could have the mic 20mm off the driver for the mid bass and right at the horn mouth for the tapped horn?
Key goal is to measure Frequency Response, Phase, Group Delay, distortion
Cheers
Mike