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System target curve and equal loudness contour

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studio45 View Drop Down
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Joined: 16 October 2007
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Post Options Post Options   Thanks (0) Thanks(0)   Quote studio45 Quote  Post ReplyReply Direct Link To This Post Posted: 29 August 2018 at 5:41pm
Flat is not normally achievable in a real room - standing waves mess everything right up, even if it measured flat in the anechoic chamber (but who ever does that....) You could EQ it to be flat according to your mic at whatever position the mic is in, but then it will be *far* from flat anywhere else in the room.

It's just got to sound nice. Plenty o' bass and not too much 2-4kHz screech, is one thing I always aim for. However, on some rigs the distortion from the horns increases in this range as you turn it up. So you are EQing out distortion, which means you are losing too much program content. 

For most PA's that I've encountered, response beyond 10kHz that actually covers a decent portion of the room is a nice bonus, but not expected. Only add large amounts of hi-shelf boost if the response doesn't seem to make it to 10kHz in the middle of the room without, and realise that the dispersion angle is likely to be quite a lot narrower than the nominal angle of the horn at these frequencies.

And, a lot of rooms of small to medium size have pretty bad standing wave problems around 100Hz. If you boost too much, it will get muddy. You might even want to cut a little, and boost at 50 or 63Hz. Of course EQ doesn't solve the problem of the standing wave increasing the decay time of the sound, so there will always be a bit of boominess, and if you try to get rid of that completely you end up cutting too much. 
Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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