modpodge = puzzlekoat
http://www.diyaudio.com/forums/full-range/131017-alpair-5-project-completed.html#post1628291
dave
http://www.diyaudio.com/forums/full-range/131017-alpair-5-project-completed.html#post1628291
dave
or, how do those relate to a particular user's application?
So far the worse thing that I've experienced with the SDX7, or the CSS FR/WR125 is the very disturbing sound when over driven - somewhat easier to do in a mis-tuned or under-damped vented enclosure. I've not heard it in a fair range of sealed or critically damped vented designs - at least not at my listening levels (below 90dB on average)
I mean other than having no where near the amount of suspension or motor to swing 11mm each way...
and even if the coil former is rugged enough to withstand ( a few) strikes against the backplate, the sonic effect is disconcerting to say the least - the first time we heard this on FR125 we thought the underpowered / low DF SE amp was at fault.
+1 , and now moot - as always it's a matter of using a device within its real world performance envelope
Maybe point to point. But looking at the graphs, I'd say even less. That is, if you want to stay within a linear range. Looks offset too.
This is like any other driver imo. There have only been a few drivers that bikinpunk has tested that come close to specs. Scan Illuminator is one of them. Personally, I put much more weight on other tests, and ultimately how it performs once hooked up and playing music. Particularly if it's going to be high passed. I listen to lots of woofers with likely less than 1mm linear travel, and enjoy them very much.
If they want to see the data, it doesn't hurt to sign up...it's free. And it's not like everyone has a Klippel machine in their backyard.
That is unless someone is afraid to see the measurements...
That is unless someone is afraid to see the measurements...
I couldn't agree more as to the relevance of virtually any measurements to actual listening, but if I understand Winslow's point, it's the discrepancy between claims and measurements that can lead to misapplication / disappointment - and unless done with malice, it serves purpose to point that out.
Too bad there wasn't a single stringent set of tests/ conditions required before publication of "measurements" of any type of loudspeaker driver - but who's gonna mandate and monitor it?
As it is, the results we see can often speak more about the test / testers than they can predict what we'll hear.
Re-reading I can see how my comment may have sounded that I meant bikinpunk's testing never matches up with published specs, and is therefore questionable, but that's not what I meant. I really respect Erin's work and trust his results. He's worked with a lot of big names to get to where he is.
What I meant was that the Klippel test that bikinpunk does usually shows serious flaws with most all drivers. Not just the SDX7. It's almost expected that even if a manufacturer claims 10mm of xmax, the actual linear range determined via Klippel testing will be,... 5mm. Even less maybe.
Xmax seems to be one of those things... We've seen it with so many manufacturers. Especially Mark Audio around here with his "alpairs aren't woofers" thread. There are so many ways to "measure" xmax. Klippel is one of those ways, that I personally think is very stringent, but most useful.
If you loved it so much, why not still love it? Even though a Klippel test says it's not linear, doesn't mean you can't enjoy it
Not to mention, Erin only tested 1 sample.
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