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Guessing one is some well know expensive speaker and the other is the WAF-1? At +/- 10 db it seems the room accoustics are the main factor and not the speaker, which isn't surprising.
Guessing one is some well know expensive speaker and the other is the WAF-1? At +/- 10 db it seems the room accoustics are the main factor and not the speaker, which isn't surprising.
The peak is at 87 dB, and the valley is at 77 dB ... which is +/- 5 dB.
And no, this is not the WAF-1.
It is the same speaker, tested twice.
In the Purple graph, it is a pair of speakers being tested for a response curve at the listening position.
In the green graph, it is the same speakers being tested through a speaker switcher, attenuating the speakers by 4 dB using the switcher, but adding 4 dB using the pre-amp, to achieve the same actual SPL.
The purpose of the test was to find out what effect the switcher had on the response curve of the speakers.
In the green graph, it is the same speakers being tested through a speaker switcher, attenuating the speakers by 4 dB using the switcher, but adding 4 dB using the pre-amp, to achieve the same actual SPL.
The purpose of the test was to find out what effect the switcher had on the response curve of the speakers.
But that is only measuring dbSPL ... Could the switcher still be imposing phase changes that the SPL measurement would miss?
Are you measuring both speakers or just one?
Could you route one speaker through the "positive" direction of the switch and the second through the reverse direction (from output to selected input)? If there were any altering of the signal other than attenuation it might reveal it better that way.
Alternatively I wonder if putting through the selector switch out of phase and then wiring them back proper-phase from the box to the speakers might help reveal any other anomalies?
I'm not a speaker selector box junkie, so these are all hypothetical questions that I have ... but would also love to know the answer to for OUR next GTG ... :D
thanks!
..dane
(The first to sport a signature on TCAforum..)
"Be kind, for everyone you meet is carrying a great burden." - Philo of Alexandria
"Love God and be nice to people." - Brooks Everett of CBC d&k's webpage
But that is only measuring dbSPL ... Could the switcher still be imposing phase changes that the SPL measurement would miss?
Are you measuring both speakers or just one?
Could you route one speaker through the "positive" direction of the switch and the second through the reverse direction (from output to selected input)? If there were any altering of the signal other than attenuation it might reveal it better that way.
Alternatively I wonder if putting through the selector switch out of phase and then wiring them back proper-phase from the box to the speakers might help reveal any other anomalies?
I'm not a speaker selector box junkie, so these are all hypothetical questions that I have ... but would also love to know the answer to for OUR next GTG ... :D
thanks!
..dane
Dane, I no longer have this switcher here, so most of your questions are moot. However, I suggest you re-read what I posted earlier. You might find some answers already there ... :angel:
Dane, I no longer have this switcher here, so most of your questions are moot. However, I suggest you re-read what I posted earlier. You might find some answers already there ... :angel:
Alright, overlooked that you said it was a pair of speakers.. :angel:
My other questions I think are still valid -- which can be boiled down to this question, "what type of qualitative information can a dbSPL graph not provide about a system?" or put differently, "what changes to a system can occur that cannot be captured by a dbSPL graph?"
I'm not causing trouble, just always wondered the answer to that question. Certainly when trying to integrate subwoofers into a system phase response issues can manifest themselves as peaks and valleys in a dbSPL graph... But I also suspect that that dbSPL graphs don't do much to provide how detailed a speaker presentation can be at presenting individual frequencies without smearing them together.. so I THINK my question is still valid? :no clue:
..dane
(The first to sport a signature on TCAforum..)
"Be kind, for everyone you meet is carrying a great burden." - Philo of Alexandria
"Love God and be nice to people." - Brooks Everett of CBC d&k's webpage
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