Avia Disc & Sub-Woofer Calibration...
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Joined: Feb 2005
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axiomite
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This is reference to the first Avia calibration disc.
In Chapter 7 (Subwoofer Calibration) the disc goes through a series of alternating high and low frequency pink noises from left main to sub, center to sub, right main to sub and so on until all speakers have gone through this pink noise process. Whenever I do this the sub is reading my pre-setting of 75/75db for the mains but 61/75 and 60/75db for the center and surrounds. The disc instructions says to calibrate the sub with either the receiver or the sub's amp so that you'll get the same db reading on the sub throughout all of the speakers but this can't be done, if I calibrate the sub to 75/75 db with the center and surrounds the sub goes through the roof whenever the mains are played. Am I missing something here?
In the past I've always calibrated all speakers using pink noise and set all db's the same.
Speakers to set to small, sub (EP600) is set to -7 db on the receiver and the crossovers are as follows, mains (80s) to 60, center (VP150&100) and surrounds (QS8s) to 100.
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Re: Avia Disc & Sub-Woofer Calibration...
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Joined: Dec 2003
Posts: 10,420
shareholder in the making
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shareholder in the making
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Wasn't there something about the calibrations being off on the Avis discs?
Jason M80 v2 VP160 v3 QS8 v2 PB13 Ultra Denon 3808 Samsung 85" Q70
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Re: Avia Disc & Sub-Woofer Calibration...
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Joined: Feb 2005
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axiomite
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I really can't remember Jay, do you believe it may be a fault with the Avia calibrating disc?
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Re: Avia Disc & Sub-Woofer Calibration...
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Joined: Oct 2006
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axiomite
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axiomite
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I've never understood that part of the Avia disk either. I try and calibrate it to my mains then eventually give in to the temptation to adjust it myself anyways.
Also, I don't have the adjustment table for my particular SPL Meter's inaccuracy for LFE. I have seen downloadable tables for the Radio Shack meter but that is a bit of a Holy Grail device here in Canada considering we haven't had a Radio Shack in many years since they pulled out and got replaced by "The Source".
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Re: Avia Disc & Sub-Woofer Calibration...
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Joined: Dec 2006
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connoisseur
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connoisseur
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In the past I've always calibrated all speakers using pink noise and set all db's the same.
I've never understood that part of the Avia disk either. I try and calibrate it to my mains then eventually give in to the temptation to adjust it myself anyways.
Same here. I usually calibrate the subwoofer to my left main and just skip the subwoofer calibration for the other speakers. My thinking was the additional test sweeps for the other channels was if you were say running stereo, tri, quad etc… subwoofers you could calibrate each speaker + subwoofer pair individually. Never read that anywhere but it was the only thing I could figure it would be useful for.
3M80 2M22 6QS8 2M2 1EP500 Sony BDP-S590 Panny-7000 Onkyo-3007 Carada-134 Xbox Buttkicker AS-EQ1
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Re: Avia Disc & Sub-Woofer Calibration...
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Joined: Dec 2003
Posts: 10,420
shareholder in the making
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shareholder in the making
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I have seen downloadable tables for the Radio Shack meter but that is a bit of a Holy Grail device here in Canada considering we haven't had a Radio Shack in many years since they pulled out and got replaced by "The Source".
Murph, if you are interested, you can get the Radio Shack SPL meter through Sonicboomaudio. I will have to look around to see where I read the avia disc is out of whack.
Jason M80 v2 VP160 v3 QS8 v2 PB13 Ultra Denon 3808 Samsung 85" Q70
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Re: Avia Disc & Sub-Woofer Calibration...
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Joined: Feb 2005
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axiomite
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I could be wrong and without going back to the disc I thought it stated the calibration process was for a single sub system. Like you Grunt, it seems to me like that particular calibration process could be designed for a multi-sub system.
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Re: Avia Disc & Sub-Woofer Calibration...
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Joined: Jun 2003
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axiomite
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axiomite
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While we're wallowing around in calibration, I'd like to ask a stupid question.
The RS analog meter has ranges for 60, 70, 80 db, right? And on the meter itself, we see 0db as the midpoint, right? So, isn't a reading of 0 on the 70db scale, well, 70db? If so, why do we try to calibrate to 75 instead of 70 or 80?
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Re: Avia Disc & Sub-Woofer Calibration...
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Joined: Feb 2005
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axiomite
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I dunno Tom, I have a digital meter. I believe the apparently broke Avia disc also states to calibrate above 70db, so I just calibrate our stuff to 75.
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Re: Avia Disc & Sub-Woofer Calibration...
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Joined: May 2003
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shareholder in the making
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That's how I read it, Tom. If I'm misreading it, then I'm listening to stuff substantially louder than I thought...
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