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Old 30th March 2006, 04:58 AM   #51
AR2 is offline AR2  United States
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And just to add this.
Before I decided on what speakers to build I made up my mind after I visited Mr. Linkwitz who happen to live just a few blocks from me. His opinion is very strong - nothing but active. When someone with his name and knowledge makes statement like that I certainly will take that as a definitive answer in question pasive vs. active crossover.
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Old 30th March 2006, 06:07 AM   #52
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Quote:
Originally posted by fazman
comparative listening tests are an interesting thing. Many times what I thought was a "better sound" I found later to be the opposite. I wouldn't want to dispute either way if one DAC sounds better than the next.
What I would be really interested in knowing is whether any one has done listening tests on a loudspeaker using the digital crossover and then again using a passive crossover on the same loudspeaker. What conclusions were made then? Surely the differences would be (whether good or bad) significant enough to reach some opinions.

Dave.
I dfid sort of that a few weeks ago. I had in my room two totally different systems. A consisted of Martin Logan Sequel II speakers driven by a power amp of my own design, passive level controls and Rotel 950 CD player. B consisted of two way speakers of my own design with 4 * 50mm Jordans for mid/high and 2 * 150mm Jordans for low, each side, bi-amped with vintage, heavily modified Sony power amps and a Behringer (output modified) driven from the digital output of a Philiops CD950. I had two identical CD's in the players and was switching between systems using the CD remotes switching between play and pause. We (4 friends and me) spend about an hour tweaking the Behringer settings to try to bring B as close to A in absolute level, freq response etc, by ear. At the end we came very close but there was still a difference we heard.

Now for the interesting part: initially we more or less unconsiouslly used the big Martin Logans as references, but after a lot of switching we lost track of what was playing at any one time, and the preferences would switch back and forth. At one time one of us remarked, for instance, that he clearly preferred the stronger and more extended bass of the Martin Logans (they are physically imposing) to the Jordans, while in fact he was listening to the Jordans, and was embarrassed when I pointed that out. We had several of these occurences, and later laughed about them good-humoured, but the lesson was that even if there is a difference you tend to favour the more physically impressive system. Which is nothing new and extensively documented, and used by audio marketeers of course but it can be sobering to be confronted with it.

Jan Didden
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Old 30th March 2006, 01:46 PM   #53
fazman is offline fazman  Canada
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Jan,
Really cool.
I sometimes listen to my set up in complete darkness so I can't see my own speakers. After listening to some Norah Jones last night I surprised myself to see that all that sound was coming from a 5" woofer and 1" tweeter.
The eyes will sometimes convince you of things your ears don't believe.
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