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Post by PGT on Aug 14, 2013 12:40:40 GMT -5
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DYohn
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Post by DYohn on Aug 14, 2013 12:48:01 GMT -5
Not that I don't believe Danny Ritchie, but even if we take his measurements at face value nothing he reports would affect system design in any significant way, nor could the human ear hear any differences in performance due to a shift in fs by a few Hz nor a slight shift in Qts (that he does not explain.)
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Deleted
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Post by Deleted on Aug 14, 2013 12:57:25 GMT -5
Well I will take my opinion on first hand results and actually doing the tests with a sub designer on all of his different designs. There may be slight varations but that could be from a number things including the test drivers.
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DYohn
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Post by DYohn on Aug 14, 2013 13:03:52 GMT -5
Well I will take my opinion on first hand results and actually doing the tests with a sub designer on all of his different designs. There may be slight varations but that could be from a number things including the test drivers. Yep. Indeed in any production run there will be variations between drivers by +/-10% or so, but that does not mean they necessarily perform differently once mounted in a system. |
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Post by PGT on Aug 14, 2013 13:49:13 GMT -5
found this to be an interesting read as well; 40-50 hours of "burn in" was the recommendation from the author and some pro's that commented. www.gr-research.com/burnin.htm |
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Deleted
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Post by Deleted on Aug 14, 2013 17:57:43 GMT -5
But of course burn-in is always for the better right? lol No one is disputing that a drivers T/S specs can change slightly but why do you assume it's audible? Thats like a car loosing/gaining 5hp from 300hp car and you getting in and driving it around and being able to tell.
It's all good though, we all can't have the same opinions on everything or we have some awfully boring message boards lol
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selkec
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SCREW YOU GUYS, IM GOING HOME!!!
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Post by selkec on Aug 14, 2013 20:54:39 GMT -5
its not the speakers breaking in..... Its you getting used to the sound.... well, that's what I believe anyways  |
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Post by dally on Aug 14, 2013 21:36:53 GMT -5
Stads very nice build! I have been contemplating the exact same build, especially now that they are giving such a good deal on the 18HO and flat pack on parts express. I was wondering if you noticed the fan on the xls 1000 coming on,and if so is it loud? I was going to get the xls 2000 thinking that it would have more robust heat sinking and that the fan would be less likely to kick on, but now I'm wondering if I could get away with the 1000 or 1500 and save some money.
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Deleted
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Post by Deleted on Aug 14, 2013 21:49:22 GMT -5
If your just gonna power one HO 18, the 1500 will have more than enough power. Actually so would the 1000 but it's not of the same quality as the 1500 and 2000, even though it's the same line.
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Post by ocezam on Sept 14, 2013 13:16:09 GMT -5
But the reality is that any driver available in the world really does not "break in" after it shipped. But, but, but... How can that be true? If my cables need a "burn in" obviously my drivers will to?! and my electronics right? I know my stuff needs a burn in 'cause I read it on the internet from some real audiophiles. I can't wait for all of my stuff to burn in. I figure once it is completely burned in, I'll have about two to three weeks of audio bliss before my equipment is worn out and needs replacement. But it'll be a killer 2 to 3 weeks! This audiophile stuff sure has a lot of rules.... ... |
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Post by Boomzilla on Sept 14, 2013 14:18:59 GMT -5
Well, from my experience, I vote with DYohn on this one. If driver performance varied more than "very, Very, VERY slightly" in the first 50 to 100 hours of use, then every design program/metric/etc. is completely worthless. Since the design programs DO work (and actually very reliably) then ipso facto the published driver specifications are valid both before AND after any "burn in."
I've always been skeptical of the entire concept of "burn in" for mechanical devices such as speakers. In electronics, the "burn in" period is where most of the failures occur, after which failure rates drop to a low (random) period. The low failure rate is good until the wear-out phase begins, where the number of failures rises logarithmically. Thus the "bathtub curve" of reliability. But I digress...
The myth of "burn in" for speakers is further validated by my listening experience. Bad sound out of the box doesn't magically become "wonderful sound" after burn in. Are there subtle changes? Yes, but I'd NEVER buy some evil-sounding box of drivers on the hope that after "burn in" it would sound like anything completely different.
Right out of the box, what you hear is pretty much what you get. Like that sound? Buy that speaker! Don't like that sound? Burn-in probably won't change a thing. What I've stated here is my personal experience. Your mileage may vary...
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Post by garym on Sept 14, 2013 14:27:31 GMT -5
stads,
Will the Omnimic software measure THD? I'm curious how that woofer fares in that respect (I'm thinking of building a pair of Dayton Ultimax 12 kits). REW will measure THD.
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Post by stads77 on Sept 14, 2013 14:32:16 GMT -5
I'm am not sure if it measures THD, as I no longer have the omni mic. I love the 18" HO, most musical beast of a driver I've had. I also believe the Crown 1000 is plenty of amp for the cabinet. I notice no fan noise or distortion even when driven hard.
Very happy owner of sub and amp
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