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| Re: Audition in Austin [message #71973 is a reply to message #71972] |
Fri, 30 March 2012 13:47   |
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Wayne Parham
Messages: 18783
Registered: January 2001
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Illuminati (33rd Degree) |
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Cones that have been exposed to sunlight get lighter in color like that. I've seen 'em turn almost white. It doesn't have to be direct sublight either - They'll get lighter even if they're exposed to indirect sunlight long enough, like in a sunroom or in a car. I suspect that's all that has happened, and I wouldn't be concerned if that's all that appears different.
But when in doubt, check it out - there are lots of cheap recones out there that look just like genuine parts but don't measure anywhere close.
Do not apply anything to either cone to change its color. If you do, you risk ruining the driver. It may look better, but it also may measure worse. You can't apply a product to the surface without changing the characteristics of the cone. There's nothing about that cone I want to change, so don't do it.
If the difference in color is bothersome, I might be inclined to expose the darker one to sunlight for a while until its color matches. This is a long process though, so if that's not something you want to do, just take 'em both to a place to see about reconing. They'll probably only have to do one, but it wouldn''t hurt to have them both checked. If you don't know who to trust, call David Miller at Speakerworks. He'll get you fixed up.
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| Re: Audition in Austin [message #71982 is a reply to message #71980] |
Sat, 31 March 2012 20:13 |
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Wayne Parham
Messages: 18783
Registered: January 2001
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Illuminati (33rd Degree) |
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It doesn't matter much what side the port is on, and I've run 'em both ways. In most of my speakers, it actually doesn't matter at all, but I like running the ports on the outside. Mostly, I think it looks better that way. I've run four π's that way too, but in truth, it's probably marginally better than the ports be inboard on these.
The offset tweeter throws the forward lobe slightly at a diagonal. Centerline of the forward lobe is still straight out in front, but the outside edges of the forward lobe are +/-25° on an arc that passes through the woofer and tweeter centerline. So that makes the upper null slightly offset one way and the lower null slightly offset the other. If the tweeter is outboard, then so is the upper null. That is good for "aiming" the ceiling slap away from the listeners.
...This is such butterfly wings flapping minutia you shouldn't care either way. You definitely can't hear the difference. But if you're a perfectionist, then that's probably the best way to set 'em up. You can get out the slide rule and the LMS measurements system and satisfy yourself that this is the better way. 
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