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Re: Axiom graphs
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Joined: Jan 2004
Posts: 13,840 Likes: 13
shareholder in the making
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shareholder in the making
Joined: Jan 2004
Posts: 13,840 Likes: 13 |
As Ian stated, Axiom does not use smoothing which prompted part of Ricks question.
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Re: Axiom graphs
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Joined: Jun 2003
Posts: 6,833
axiomite
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OP
axiomite
Joined: Jun 2003
Posts: 6,833 |
I got that part Randy. What I don't understand is is the difference in how the anechoic chamber compares to them being done quasi-anechoic and to what affect the different db levels affect the graph being compared.
Rick
"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud
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Re: Axiom graphs
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Joined: Sep 2008
Posts: 4,116
connoisseur
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connoisseur
Joined: Sep 2008
Posts: 4,116 |
The main difference between the two is the anechoic chamber is built without any echoes and is not room influenced at all. Quasi-anechoic measurements are not accurate below the midrange where the room starts to dominate with this technique. So the amount of accurate information you can gather is more limited with the quasi-anechoic measurement.
Neither technique can measure low frequencies accurately. This is why subwoofers are measured outside.
Different db levels show at what SPL the frequency sweep occurs at. If there are deviations in the frequency response at increasing sweep levels it is a sign the speaker is stressing aka compression.
I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.
-Max Payne
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Re: Axiom graphs
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Joined: Jun 2003
Posts: 6,833
axiomite
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OP
axiomite
Joined: Jun 2003
Posts: 6,833 |
Thanks Doc. So can it be said a speakers measurement done quasi will not be considered to be measured as accurate as one done in an anechoic chamber?
Rick
"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud
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Re: Axiom graphs
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Joined: Sep 2008
Posts: 4,116
connoisseur
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connoisseur
Joined: Sep 2008
Posts: 4,116 |
If you look at measurements done quasi-anechoic, they never show the speaker below 200hz. On the other hand an anechoic chamber will give you accurate information below that. For a full range floorstander, the anechoic chamber will not accurately assess the bass response though.
I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.
-Max Payne
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Re: Axiom graphs
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Joined: Dec 2007
Posts: 7,786
axiomite
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axiomite
Joined: Dec 2007
Posts: 7,786 |
Hi Fred,
I just wanted to note that we do not smooth any of our graphs. I am not sure where that piece of misinformation started but it could be related to someone comparing original series graphs to v3 graphs; the v3s are much smoother. There has been some talk lately of changing our graphs to a 60 dB scale and including some off axis graphs and the sound power. We will probably start changing the graphs on the site later next month. Thanks for the correction Ian. My apologies for misstating the case. I was looking at the old NRC measurements and did not take into account the difference in scale. I do need to clean the troll crap off my shoes though. I've been wading through bad threads again.
Fred
------- Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!
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