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RE: 360° speaker users: flat pink noise response?

Posted by BigguyinATL (M) on January 24, 2017 at 08:27:14

In Reply to: 360° speaker users: flat pink noise response? posted by dave789 on January 14, 2017 at 19:38:58:

I've owned Planars and the Obelisk from Shahinian, as well and messed a lot with Bose 901's in various setups and rooms. An Omni always provides an "on-axis" response independent of the orientation of the speaker (at least horizontally). In my opinion i get the best sound with a flat response on the intial arrival - however if you are playing steady pink noise, the pressure you get at the microphone in a somewhat reverberant room will have a reverberant component that roles off with frequency and a direct component that is usually louder. in the higher frequencies (say above 5kHz) most rooms with have very little reflective energy - so you can set the pink noise response flat above 5kHz and be pretty much assured that you are measuring the initial arrival.
In the Presence range (1-5kHz) yo can find a lot of reflected energy in a room - so the continuous pink noise level should drop 2-3 dB in this range. Below 1KHz you will find room geometry based reflections for reinforcement or cancellation - so here it is important to average several microphone positions to find an Average level to match up to that presence range level.
For the room modes frequencies (150-300Hz and Down depending on room size) - loudspeaker placement and sub integration with Bass management needs to be used. That is complicated and independent of the directivity of the loudspeaker - but is important to be smooth for playback of music.

Sometimes this leads to a slightly valley like response for a pink noise target. Note, The Shahinians were pretty much spot on out of the box! Only a little bass EQ used in a 17 x 12 room - speakers 42 inches our from the short wall.

FYI I use precision measurement instrumentation with a free field microphone to measure loudspeaker response. Note that many measurement microphones are not free field - though a 1/4 inch omni "Random" capsule is pretty good to 8kHz

Full disclosure: I work for Bruel & Kjaer and using accurate instrumentation is not a problem.




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