blind testing of speakers
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Joined: Jan 2011
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can someone at Axiom tell me within how many dB's 2 different speakers are adjusted for equal volume before doing critical blind or double blind listening tests?
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Re: blind testing of speakers
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Joined: Jan 2004
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shareholder in the making
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shareholder in the making
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I believe they use a special switcher so the speakers are exactly set the same, plus other criteria. Keep in mind, placment will play a huge roll.
M80s VP180 4xM22ow 4xM3ic EP600 2xEP350 AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85
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Re: blind testing of speakers
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Joined: Feb 2005
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axiomite
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axiomite
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Keep in mind, placment will play a huge roll. Would that be like a big 'ol drum roll Randy?
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Re: blind testing of speakers
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Joined: Mar 2001
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President connoisseur
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President connoisseur
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J.B.
It is very important to get the SPL of each one exact. With careful set up you can get them within fractions of a decibel. As SirQuack mentioned the positioning can also play a roll so if the results are close the positions need to be exchanged and the test repeated to ensure your results do not change.
Ian Colquhoun President & Chief Engineer
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Re: blind testing of speakers
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Joined: Aug 2009
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axiomite
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axiomite
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Keep in mind, placment will play a huge roll. Would that be like a big 'ol drum roll Randy? Myself, I prefer lots of butter on mine. (I've been on a strict diet. How could I not think of food.)
Last edited by CatBrat; 11/08/11 10:25 PM.
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Re: blind testing of speakers
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Joined: Feb 2005
Posts: 5,210
axiomite
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axiomite
Joined: Feb 2005
Posts: 5,210 |
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Re: blind testing of speakers
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Joined: Jan 2004
Posts: 13,841 Likes: 13
shareholder in the making
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shareholder in the making
Joined: Jan 2004
Posts: 13,841 Likes: 13 |
M80s VP180 4xM22ow 4xM3ic EP600 2xEP350 AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85
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Re: blind testing of speakers
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Joined: May 2002
Posts: 10,654
shareholder in the making
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shareholder in the making
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Jacques, the "roll" that using different frequencies plays when calibrating for equal speaker volume is also interesting. Primarily electronic components such as receivers and players have so little variation in frequency response across the 20Hz-20KHz range that using one frequency(e.g. 1000Hz)to set levels equal will result in audibly equal levels for the entire range. Speakers, on the other hand, have much larger variations which often occur at different frequencies for different speakers. For example, if speaker A was 2dB louder at 1000Hz than was speaker B, lowering A by 2dB would result in equal volumes at that frequency, but if B was 2dB louder than A at say 2000Hz(certainly a common possibility)then the 2dB adjustment previously made because of the 1000Hz measurement would result in 2000Hz now being 4dB louder in favor of B.
Using pink noise, which contains the entire frequency range in a way roughly similar to music, rather than a specific frequency when setting levels can result in a better average leveling result when comparing speakers with music selections. It would be interesting to hear Ian's comment on what Axiom uses in equalizing levels.
-----------------------------------
Enjoy the music, not the equipment.
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Re: blind testing of speakers
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Joined: Sep 2004
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axiomite
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axiomite
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Huge roll? or Huge Roll? Yes, that is a roll of toilet paper. Sorry JB.
Farewell - June 4, 2020
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Re: blind testing of speakers
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Joined: Jan 2011
Posts: 1,291
connoisseur
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OP
connoisseur
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J.B.
It is very important to get the SPL of each one exact. With careful set up you can get them within fractions of a decibel. As SirQuack mentioned the positioning can also play a roll so if the results are close the positions need to be exchanged and the test repeated to ensure your results do not change. what i would like to know is what fraction of a decibel are those speakers usually adjusted to.
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