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Post by eagleman on Nov 13, 2010 15:37:18 GMT -5
I am setting up my speakers and can not find the volume reference level in the manual for the UMC-1 to calibrate my speakers. Does anyone know what it is. I know you set it to 75 db for each speaker .
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Deleted
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Post by Deleted on Nov 13, 2010 15:48:58 GMT -5
I used a db meter and set all my speakers to 74db +-.5db I believe the speaker level tone is in that neighborhood. Around 73-75db Hope i helped you in some small way
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Post by eagleman on Nov 13, 2010 16:05:45 GMT -5
I used a db meter and set all my speakers to 74db +-.5db I believe the speaker level tone is in that neighborhood. Around 73-75db Hope i helped you in some small way Yes the speaker level tone should be 75db. But what do you set the volume on the processor at before you adjust to 75db. The volume should be set to a reference level before you adjust the speakers to 75db. I do not know what that reference level is.
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ratmice
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Post by ratmice on Nov 14, 2010 0:54:29 GMT -5
You should adjust the master volume so that the left front speaker registers 75dB on your SPL meter, while setting the trim to 0. Its kind of backwards, using the meter to determine the initial master volume setting.Then use the trim to adjust all other speakers to 75dB while cycling through the test tones. Some have reported that the master volume and Dolby Volume are calibrated at a master volume of 50.5. Some find this to be quite loud, depending on the sensitivity of your speakers.
p.s. Take note of the master volume level that you initially determine for the LF speaker. This will be your reference level.
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Post by aussie on Nov 14, 2010 4:39:42 GMT -5
You should adjust the master volume so that the left front speaker registers 75dB on your SPL meter, while setting the trim to 0. Its kind of backwards, using the meter to determine the initial master volume setting. This is kind of backwards, using the meter to determine initial volume setting. Then use the trim to adjust all other speakers to 75dB while cycling through the test tones. Some have reported that the master volume and Dolby Volume are calibrated at a master volume of 50.5. Some find this to be quite loud, depending on the sensitivity of your speakers. p.s. Take note of the master volume level that you initially determine for the LF speaker. This will be your reference level. Very good advice, it's hard to give a set dial level for reference as a great deal will depend upon amp and speaker sensitivity. On my UMC-1 reference is about 34 on the dial from memory. Alot suggest 50.5 but even if I set all my trims to -10 I'm still way over 75dB-C
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Post by bfisher on Nov 14, 2010 12:01:24 GMT -5
50.5 is about right for me... using Emo speakers/amps/processor. All depends on your equipment and room.
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Pauly
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Post by Pauly on Nov 14, 2010 16:30:02 GMT -5
Yes it all depends on your speakers. 75db for me is at a volume of 27. 50.5 would make my ears bleed lol.
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Post by eagleman on Nov 15, 2010 16:32:49 GMT -5
THX reference level is 0. At 0 I do not get any sound at all.
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ratmice
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Post by ratmice on Nov 15, 2010 16:42:03 GMT -5
THX reference level is 0. At 0 I do not get any sound at all. You have that backwards, 0 dB is defined as THX reference level.
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Pauly
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Post by Pauly on Nov 15, 2010 16:47:53 GMT -5
They say it's 0 on a THX receiver or pre/pro with a "normal" volume control that starts at 100, and as you turn it up, the numbers go down. -99 -98 -97 etc until you get max volume at 0(85db) with peaks of 105db. IMO, this really doesn't indicate anything. If you have extremely sensitive speakers, "0" would be far too loud for most people(ear damage). If your speakers are hard to drive, and your amp is only putting out 30 w/channel, then yeah, "0" would be necessary to obtain loud volumes.
People put far too much faith into THX specs, and what they say is "right".
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ratmice
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Post by ratmice on Nov 15, 2010 17:28:43 GMT -5
They say it's 0 on a THX receiver or pre/pro with a "normal" volume control that starts at 100, and as you turn it up, the numbers go down. -99 -98 -97 etc until you get max volume at 0(85db) with peaks of 105db. IMO, this really doesn't indicate anything. If you have extremely sensitive speakers, "0" would be far too loud for most people(ear damage). If your speakers are hard to drive, and your amp is only putting out 30 w/channel, then yeah, "0" would be necessary to obtain loud volumes. People put far too much faith into THX specs, and what they say is "right". This is true only if. and only if, the auto calibration has been run, and furthermore, if that's the case, then 0 is the same on every system, regardless of speaker sensitivity. Also, most relative volume scales go well above 0 dB - typically in the 15 to 20 range. My point above was to impress that 0 dB has no intrinsic value (or volume), until it is set as the level for THX reference playback, via the auto cal procedure.
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Pauly
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Post by Pauly on Nov 15, 2010 17:39:21 GMT -5
Got it ratmice, I was just reading that on a website. I didn't realize the auto cal is what sets the 0 reference level for THX playback. Learn something new every day.
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ratmice
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Post by ratmice on Nov 15, 2010 17:49:37 GMT -5
And, at some point, you have forgotten more stuff than you now know And, if you're me, you never knew that much to begin with
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Pauly
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Post by Pauly on Nov 15, 2010 17:50:40 GMT -5
x1,000,000
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Post by copperband on Nov 15, 2010 21:37:55 GMT -5
Hi, I started reading this forum a few months ago hoping to gain more knowledge on this hobby. I do learning every day but as I read more I start getting confuse, like this topic here. I use a SPL meter from Aperion to setup my system a while ago, bypassing the MCACC from my Pioneer receiver as i heard people saying the auto calibration does not work very well.... I check my SPL meter and the range is from -10 db to +6, so what do you mean when you all said set it to 75db, there is no 75db on my meter? What is trim at 0? I used Weighting of C, Range of 70, and slow Response on my SPL meter when I setup my system. These may be very basic questions but I am getting confused now... My XPA-5 is coming at the end of this week so I would like to understand all these to make sure I do the right thing to get the best sound qualify out of my system. My system is listed under my signature.
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iceman66
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Post by iceman66 on Nov 15, 2010 21:51:00 GMT -5
If your meter range is set on 70 and you have a display range of -10 to +6 then you can measure from 60 to 76, I assume you have other ranges available on the meter?
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Post by doc1963 on Nov 15, 2010 23:39:53 GMT -5
I check my SPL meter and the range is from -10 db to +6, so what do you mean when you all said set it to 75db, there is no 75db on my meter? The dial set to 70 and meter reading +5 would equal 75 db. Left front speaker trim set at "zero" in the Speaker Setup menu of your AVR or processor. I used Weighting of C, Range of 70, and slow Response on my SPL meter when I setup my system Those are the correct settings to use. In any manual calibration of an AVR or Preamp/processor, the goal is to balance the SPL of all of the speakers in your system. In doing so, the left front speaker is the starting reference. The "level trim" of the left front should be set at "0 db". In the case of an AVR or pre/pro where the built in test tone is volume dependent (as with the UMC-1), set the master volume control low and slowly turn the volume up until your meter reads 75 db from the left front speaker. Note the volume level. This is now the point at which the volume control of your AVR or pre/pro reaches your "reference" volume level of 75 db. At this point, leave the master volume control alone and move to the next speaker to be set (usually the center channel). Now use your "level trim" to increase or reduce the level to match 75 db. Repeat the process on all of the remaining channels in your system including your sub (note that some like to run the sub a few dbs hot). Hope this helps.....
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Post by copperband on Nov 16, 2010 11:08:06 GMT -5
thank you so much! I have a better understanding now.
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