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Post by spnolan14 on May 4, 2010 7:53:32 GMT -5
Decibel, if you have an iPhone there is an SPL meter app that is just as accurate as a rat shack meter.
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Post by markus on May 4, 2010 8:40:25 GMT -5
Don't think it's accurate enough. From www.faberacoustical.com/products/iphone/soundmeter/"...for best results, SoundMeter should be calibrated before use. Sound levels may be off by 6 dB or more when using the default microphone sensitivity. Note: SoundMeter has not been shown to meet ANSI or IEC standards for sound level meters." Defeats the purpose if you have to calibrate a device you want to use for calibration  |
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Post by ghstudio on May 4, 2010 8:53:28 GMT -5
Would someone from Emotiva confirm that 50 is the correct master volume setting for Dolby Volume? (or give us the correct setting). |
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Post by ghstudio on May 4, 2010 14:01:51 GMT -5
bump
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Post by dcibel on May 4, 2010 14:12:12 GMT -5
Just to clarify, "50" is supposed to be 75dB at the listening position? That seems a bit low to me, then again, if the level is supposed to be that low, could explain the bloated bass I hear when my system is louder at a lower volume setting.
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Post by markus on May 4, 2010 14:14:23 GMT -5
Yes, of course. Reference level is always measured at the listening position.
But setting the reference point for Dolby volume to "50" just doesn't make any sense when the UMC-1 doesn't know anything about the amps and speakers. Hope Emotiva will clearify the whole Dolby Volume & calibration behavior. I've sent support and Lonnie a bug report via email but haven't heard anything yet.
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Post by johnnyg on May 4, 2010 14:24:04 GMT -5
Would someone from Emotiva confirm that 50 is the correct master volume setting for Dolby Volume? (or give us the correct setting). Good luck. I've been trying for months to get that bit of information, but all I got was slammed by other forum members for not understanding that reference level on some systems will occur at different volume settings than others. Based on the curves posted by markus (excellent work BTW), there IS an internal reference level and it is somewhere near 50. Also please include that the volume control increments are 0 to 80 in 0.5 db steps... And note which value corresponds to reference level. |
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Post by ghstudio on May 4, 2010 17:08:03 GMT -5
As I understand Dolby Volume and it's implemention, dolby volume must be based on a setting of the master volume control. It could not work on individual speaker adjustments. So it's important to know the master volume setting that corresponds to "normal" for Dolby Volume.....and then with that volume set, each speaker should be individually adjusted to output 75db of pink noise at the major seating area.
I don't believe Dolby Volume could work any other way.
The only input we, users, need is the setting of the master volume that is "assumed" as normal by the Dolby Volume circuitry.
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Post by dcibel on May 4, 2010 17:33:25 GMT -5
Indeed. Now we are getting somewhere. We understand the problem, and have a proposed solution that would suffice. Now all that is required is an implementation. I think there is a lot of good information in this thread, hopefully Emotiva will read it and pursue a firmware change to rectify the problem. After all the necessary bug fixes of course. |
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Post by dcibel on May 5, 2010 2:17:16 GMT -5
Well I played around with the settings, and found that I get a lot better results with Dolby Volume with the speakers set to -7.0dB. This is a bit disconcerting, as my speakers aren't very sensitive (about 86dB@2.83V/1m), however they are in a small room. If I had some high sensitivity pro-audio speakers, I likely would not be able to adjust the levels enough to compensate. I guess the 30dB of voltage gain that my amp provides is a bit much, but I honestly don't think it's anything out of the ordinary.
Just thought I'd throw that out there...I may know someone with an SPL meter, so maybe in the future I can take some noise measurements.
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Post by dcibel on May 5, 2010 4:35:29 GMT -5
I should add that I installed the beta2 firmware yesterday, and quite often now it appears that the dolby volume auto-EQ is not applied until I touch the volume control. I noticed this problem was submitted to the error tracker spreadsheet by red5ive a while ago.
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Post by Nemesis.ie on May 5, 2010 10:29:23 GMT -5
Just an observation:
I also noticed that after a reset to factory defaults, the "DV off" level is much higher than it was. I had applied 6b2 on top of 6b1 (which was on top of factory shipped v6) without a factory default reset.
No when I engage DV low, most of the time the level drops versus off, it used to be the other way around, with overall volume increasing.
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