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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10920 |
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Put the mic further back, especially for multiple boxes. 4m or more. If there are boundaries nearby you’ll also have a reflection causing cancellations in response. You can potentially window these out a little but not say an entire building or big solid wall within 7m or so.
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king david
Young Croc Joined: 17 January 2007 Location: italy Status: Offline Points: 1324 |
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Thanks
Much better now
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10920 |
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Nobody actually measures their boxes at 1m. You measure further away and scale to 1m. After all, how much of your audience is 1m away from each speaker?
10m gives the easiest maths, apply 28.3v for sensitivity measurements. Any less, and you just gotta do some logarithmic sums. Assuming that is a calibrated mic, of course. |
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king david
Young Croc Joined: 17 January 2007 Location: italy Status: Offline Points: 1324 |
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if I do, I would expect police to show up :D
did this today, at 1m outdoor, boundaries and walls at about 15m green is no filters no eq orange is response from processing some technicians did for me (and it doesnt work that well, thats why I do on my own) purple is 30/70hz 24db LR with some little corrective eq,will try again in the afternoon REW with umik 1 mic, dsp is nst audio d48s started to measure kick and trying to time align and the wind started to blow messing everything up but really thanx for all advices toastyghost, I've got to learn a lot... Edited by king david - 06 January 2019 at 1:08pm |
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fatfreddiescat
Young Croc Joined: 15 October 2010 Location: N.E.Wales Status: Offline Points: 1081 |
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Thanks for posting these measurements, would be nice to see the phase response of the unfiltered measurement as will show where the horn loads down to and also what is happening at the upper notch.
Don't think you need such a severe HP filter, have you tried a 2nd order Butterworth? Less steep filter will reduce GD and also the the Butterworth filter has less effect above it's cutoff, is has a sharper knee I would have thought those drivers would more than cope with that approach.
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10920 |
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Looks to me like you have the HPF set a little too gentle. Try a BW24. It’s also worth doing the CEA2010 test in REW (read the manual) to see how the box behaves at full output, it’s often very different to how it measures with low level signal and your preset should be somewhere towards how it’ll be used most often. It’s easy to make a sub look nice with low voltage but often it sounds pants when driven hard!
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10920 |
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Better than phase response for subs is the impedance plot and group delay, because all subs will be stretched in time more than any other section of the system. Also, absolute phase is sometimes tricky to measure. You definitely need to be more than 1m away for that - same for EQ and filters to be honest, at 1m you’re barely past the acoustic centre of the box’s output. |
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Tonskulus
Registered User Joined: 15 September 2017 Location: Finland Status: Offline Points: 425 |
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Yes, please, do the measurements at least 5m away! :) wish it was summertime, cant wait to do my own response measurements @ outdoors. I have umik1 + rew too.
And it is true, response might be - or will be way different if you compare at 1 watt and 500watts input. Edited by Tonskulus - 06 January 2019 at 6:42pm |
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king david
Young Croc Joined: 17 January 2007 Location: italy Status: Offline Points: 1324 |
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did it again at 10m...
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king david
Young Croc Joined: 17 January 2007 Location: italy Status: Offline Points: 1324 |
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this is
hog w/18sw115 30/60 24db lr with es18 w/18nw100 on top, think low cut on 18nw is lr 24db and higher up its 140hz 12db butterworth but I don't remember now, phase was flipped on the es18, can't remember delay Edited by king david - 06 January 2019 at 7:09pm |
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fatfreddiescat
Young Croc Joined: 15 October 2010 Location: N.E.Wales Status: Offline Points: 1081 |
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Agree that mpedance plot would be nice to see. Thanks again for uploading the plots David, I think less is more re hp filter, never found a need to use more than 2nd order on a dual spider subwoofer.
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paulus
Old Croc Joined: 14 December 2005 Location: SOUTH BIRMINGHA Status: Offline Points: 3181 |
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noticed sound imperial sound army using turbomax red eyes in there scoops now !!
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TRENDSETTER SOUND SYSTEM
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