Re: Avia Disc & Sub-Woofer Calibration...
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Joined: Mar 2008
Posts: 1,378
connoisseur
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connoisseur
Joined: Mar 2008
Posts: 1,378 |
Just look at the M80 graph... It's -6db at 40hz from 100Hz.
LFR1100 Actives,QS10HPx2,QS8x2,EP800,M3x4,M3x2 (Wood),M5HPx2 (Wood),AxiomAir,ADA1500-8,ADA1500-7
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Re: Avia Disc & Sub-Woofer Calibration...
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Joined: Mar 2008
Posts: 1,378
connoisseur
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connoisseur
Joined: Mar 2008
Posts: 1,378 |
+/-3db means it can be 6db off the peak... which it is.
LFR1100 Actives,QS10HPx2,QS8x2,EP800,M3x4,M3x2 (Wood),M5HPx2 (Wood),AxiomAir,ADA1500-8,ADA1500-7
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Re: Avia Disc & Sub-Woofer Calibration...
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Joined: Mar 2008
Posts: 1,378
connoisseur
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connoisseur
Joined: Mar 2008
Posts: 1,378 |
Sorry to multiple post...
And, the EP500 is almost flat as a board down to 20 Hz (and 10db higher to start with, which can be attenuated with the gain knob). That's why you need a sub to extend to the low frequencies.
LFR1100 Actives,QS10HPx2,QS8x2,EP800,M3x4,M3x2 (Wood),M5HPx2 (Wood),AxiomAir,ADA1500-8,ADA1500-7
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Re: Avia Disc & Sub-Woofer Calibration...
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Joined: Jun 2003
Posts: 6,833
axiomite
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axiomite
Joined: Jun 2003
Posts: 6,833 |
The +/- 3db does mean it can be off either +3db or - 3db which is a 6db swing but not down 6db at 34hz.
Rick
"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud
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Re: Avia Disc & Sub-Woofer Calibration...
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Joined: Mar 2008
Posts: 1,378
connoisseur
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connoisseur
Joined: Mar 2008
Posts: 1,378 |
It can mean -6db off the high point, wherever that point is.
LFR1100 Actives,QS10HPx2,QS8x2,EP800,M3x4,M3x2 (Wood),M5HPx2 (Wood),AxiomAir,ADA1500-8,ADA1500-7
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Re: Avia Disc & Sub-Woofer Calibration...
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Joined: Mar 2008
Posts: 1,378
connoisseur
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connoisseur
Joined: Mar 2008
Posts: 1,378 |
Hey, here's the graph, you tell me your interpretation. http://www.axiomaudio.com/gallery_m80ti_diagram.html
LFR1100 Actives,QS10HPx2,QS8x2,EP800,M3x4,M3x2 (Wood),M5HPx2 (Wood),AxiomAir,ADA1500-8,ADA1500-7
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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
Joined: Dec 2003
Posts: 10,420 |
The graph does not lie nor does Steve. Many manufacturers quote their specs this way.
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: Jun 2003
Posts: 6,833
axiomite
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axiomite
Joined: Jun 2003
Posts: 6,833 |
A quote from Alan's article. A simple claim of frequency response that cites two frequency extremes unqualified by a dB specification (e.g., frequency response: 34 Hz - 22 kHz) is meaningless and useless. It may mean that although the speaker responds at 34 Hz--the cone moves a bit, perhaps--nothing will be audible because the speaker's response at 34 Hz is at -30 dB and inaudible! On the other hand, if Axiom states that the M80’s frequency response is 34 Hz - 22 kHz +/-3 dB, this indicates that every tone that emerges from the M80 will be within 3 dB of any other over that entire frequency range. Alans article
Rick
"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud
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Re: Avia Disc & Sub-Woofer Calibration...
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Joined: Mar 2008
Posts: 1,378
connoisseur
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connoisseur
Joined: Mar 2008
Posts: 1,378 |
if Axiom states that the M80’s frequency response is 34 Hz - 22 kHz +/-3 dB, this indicates that every tone that emerges from the M80 will be within 3 dB of any other over that entire frequency range. Well, that is either misquoted, or untrue, or both. The tolerance is +/-3db, not +/-1.5db. To be +/-3b is a 6db swing. Axiom's graph shows the evidence.
LFR1100 Actives,QS10HPx2,QS8x2,EP800,M3x4,M3x2 (Wood),M5HPx2 (Wood),AxiomAir,ADA1500-8,ADA1500-7
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Re: Avia Disc & Sub-Woofer Calibration...
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Joined: May 2002
Posts: 10,654
shareholder in the making
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shareholder in the making
Joined: May 2002
Posts: 10,654 |
As Steve comments, if a speaker was 6dB down from a high point at a particular frequency, that frequency would still fall within a +/- 3dB spec, which encompasses a 6dB "window".
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