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Post by Ethan Winer on Apr 23, 2016 16:15:06 GMT
I think there may be some "standards" for room response and ringing. The Grammy Surround Standards mention a bit about room sizes and shapes, but not specific performance data. They do mention other sources though, and it's a good read anyway. --Ethan
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Post by Hexspa on Apr 25, 2016 5:23:16 GMT
Your new response is clearly better. Excellent decay time. No more null at 2k. Care to share exactly what went into "moving things around"?
Thanks,
m
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Post by starandchlorisse on Apr 29, 2016 0:55:14 GMT
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Post by Hexspa on Apr 29, 2016 4:10:30 GMT
Super cool man. Can't wait to hear some work you do out of this space. I bet the room sounds bigger, like the walls disappeared, from the listening position. You could probably do some recording in there with so much coverage.
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Post by Hexspa on May 15, 2016 14:03:46 GMT
Did you ever get that peak at 320Hz handled? I think that corresponds to a boundary about 1' 9" between your speakers and mic. From the looks of your pics that'd be your desk. Have you tried either placing treatment there or moving your speakers to different locations?
Plus, I was thinking: your response is within +-10dB from that peak down to where your speakers are rated - maybe don't worry about it?
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Post by starandchlorisse on May 16, 2016 3:25:55 GMT
Did you ever get that peak at 320Hz handled? I think that corresponds to a boundary about 1' 9" between your speakers and mic. From the looks of your pics that'd be your desk. Have you tried either placing treatment there or moving your speakers to different locations? Plus, I was thinking: your response is within +-10dB from that peak down to where your speakers are rated - maybe don't worry about it? I have not tried to solve the problem yet. On my desk when mixing or running a test there is a layer of acoustical foam - so there is not hard surfaces besides...... myself on the chair. I tried different locaitons but the 350 does not change. At some point I will try treating two spots on the celling . Regarding the "response which is within +-10dB (actually +- 5 db ) from that peak down to where my speakers are rated" I m not sure if I understood well the question but id I did there are different settings on the speaker - they could perform higher in the lows but I think the way I set it up the the overall response is more flat -- I think this is better - isn't it ? If you mean the speakers performance overall I don't really know. Looking different frequency room responses I see almost the same thing - I have not seem any real life situation where the speakers in a treated room don't roll off in the higher or lower frequencies. I m curious though to see if that exists. This is one of the the best I have seen- from Ethan 's video and the performance of the speakers is somehow similar. ethan room testing frequency responce.tiff (281.37 KB)
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Post by Hexspa on May 16, 2016 4:53:15 GMT
Congrats on your response. +-5 is remarkable - especially for DIY.
Regarding your "speaker's roll off": I remember there being the point in this thread about it. Maybe it's not relevant.
Anyway, I'm asking because my response presently has a null around 430Hz so, being it similar in distance, I thought I'd ask what your solution was.
Apache!
-m
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Post by starandchlorisse on May 24, 2016 20:51:01 GMT
I calibrated the sub and the monitors - using an old 60 $ sound meter and then I just run some tests without saving them -I will do it again though and publish the results.
The responce in the lows was ....horrible even if I tried to calibrate the phase Big peaks and valleys etc
Then I just turned down a little the sub volume and measured again the responce was really good- is this way ,,,,cheating or it is proper - ! I think it is must be ok just trying to verify -
Many thanks
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Post by Hexspa on May 24, 2016 22:46:39 GMT
I calibrated the sub and the monitors - using an old 60 $ sound meter and then I just run some tests without saving them -I will do it again though and publish the results. The responce in the lows was ....horrible even if I tried to calibrate the phase Big peaks and valleys etc Then I just turned down a little the sub volume and measured again the responce was really good- is this way ,,,,cheating or it is proper - ! I think it is must be ok just trying to verify - Many thanks I don't think "turning down a little" the sub should make a response go from "horrible" to "really good" unless your: A.) sub, B.) "old.. sound meter) or C.) other random factor are faulty. Regarding ringing: there is an article that suggests, "The requirement is for 20 dB of decay at 150 ms above 40 Hz where a 300 ms window time has been chosen." www.hifizine.com/2011/09/bass-integration-guide-part-2/www.hifizine.com/2011/06/bass-integration-guide-part-1/Thanks, -m
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Post by Ethan Winer on May 25, 2016 16:22:21 GMT
I agree, turning down the sub might make the sub's overall level match better with the regular speaker levels. But peaks and nulls and ringing are the same whether soft or loud.
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Post by starandchlorisse on May 30, 2016 18:55:32 GMT
These are new measurements after calibrating the speaker with themselves and with the sub. I calibrated the sub taking measurements with fuzz measure - trying to locate where the frequency response below 300 Hz to be in a 10 db window ( -+ 5 db) Besides the previous errors addressed by Ethan at 350 Hz there 2 small peaks at 30 Hz and (maybe the 350 Hz peak as well ?) which can be easily be treated with equalization I think. Since all critical mixing work is done through logic this would be easier I assume.
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Post by starandchlorisse on May 30, 2016 18:58:44 GMT
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Post by Ethan Winer on May 30, 2016 19:02:27 GMT
EQ'ing a peak at 30 Hz is fine, but 350 Hz is a little high for EQ. If you want to try that, measure at a few places around the room to be sure 350 Hz doesn't dip too low somewhere you might want to listen.
--Ethan
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Post by starandchlorisse on May 30, 2016 19:05:10 GMT
More recent measurements after playing with the controls of Focal monitors. thanks again.
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Post by starandchlorisse on May 30, 2016 20:27:09 GMT
Ethan thanks for your help as always - 1. from your previous responses I assume that even if I dont eq the 350 HZ is not that significant to compromise the overall response??? If however I want to EQ it around you mean the my mixing spot correct ? Because other places of the room are not used for critical listening for mixing etc just movies etc. 2. Also from what I read in your book reverb data is adequate? 3. My rear wall is treated with bass traps - corners etc see pic - if I build diffusers to add without removing the bass traps - is there any chance the bass response to be worse for any reason? lh3.googleusercontent.com/DbmPuECFwux63F_ehZ5ZBQrPdtY5or350Vy7HWetf7yJlXQcL4QzRIBvJndXUUCOi3fRfA=w1176-h518
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