Got one of these tweeters to play with. I noticed the voice coil is angled a bit. I know these things are rarely perfect but I didn't expect to see it this clearly by eye.
What do you guys think, is this going to be a problem? I feel like it might limit excursion if one side of the coil is in / out of the gap. I can not test it right now as I'm moving stuff..
Either way, I thought the photos might be appreciated.
I do notice that there is no damping material visible in the middle of the chamber! I assume there is some in the outer area that I can't see? Otherwise huh...
What do you guys think, is this going to be a problem? I feel like it might limit excursion if one side of the coil is in / out of the gap. I can not test it right now as I'm moving stuff..
Either way, I thought the photos might be appreciated.
I do notice that there is no damping material visible in the middle of the chamber! I assume there is some in the outer area that I can't see? Otherwise huh...
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Yep, the damping is aligned radially under the magnet
Clever way of doing it, it basically maximizes the pathlength of the damping
Good engineering as usual from SB Acoustics (I cut mine in half)
The polyfill in mine was added by me, it's documented in my "Metlako" thread
Clever way of doing it, it basically maximizes the pathlength of the damping
Good engineering as usual from SB Acoustics (I cut mine in half)
The polyfill in mine was added by me, it's documented in my "Metlako" thread
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I think you have one not up to scratch. I have one here that is open and it looks pretty straight to me, not like what you've got.
I also have a Scan-Speak D2608 open here, the gap is much tighter and hence tolerances far higher. In fact, if the gap in the CDC tweeter was like the D2608, then it would have higher sensitivity than its rated 89dB. That would have been nice. I see a nice amount of copper though.
Just wanted to say I showed the photo to Sound Imports where I bought this tweeter and asked their opinion. They said they think it should be replaced, so they will send me a new one. Great service and honesty 🙂
I was thinking of buying a pair of these tweeters. If this is typical of quality control I'm not so sure....
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How funny, just the other day I was about to post about how impressed I was with SB/Satori quality control. I've measured a bunch lately for a couple projects, and the impedance and response were as tight as any manufacturer I've ever measured. But no manufacturer is perfect obviously.
Every manufacture has a few bum units, you just need to buy from a distributor who will sort things out if necessary. I wouldn't buy drivers from eBay or AliExpress. FWIW I didn't tell Sound Imports "Hey, I want a replacement" I just asked what they thought about my photo and they called me (old fashioned voice chat!) to say they will replace it.
They probably account for that radial misalignment in the gap width, but nonetheless its a bit concerning to see that much tilt in the VC. Alot of larger tweeters have this issue but it doesn't always reflect in the measurements. I would bet the VC wobble at Fs would be more of an issue.
It is not typical of SB's quality control. Myself and others have used so many of their drivers and not seen any problems what-so-ever. But it just shows that there can be one-offs and it's good to know that they replaced it without quibbles.
I've yet to see anything bad from SB acoustics. Always had consistent products from them which met specs pretty closely. Even their smaller cheaper tweeters are on spec. I bought 40 SB26STCNs and they all were within +/- 20hz within Fs, and that's without any ferrofluid. Thats pretty impressive IMO.
I've certainly always had excellent results with their CDC and Satori tweeters -all those I've measured have been smack on the published spec. Slightly patchier results with some others -including one tweeter which was apparently chucked into the box upside down, with the unsurprising result of a 300Hz+ difference in Fs. I put it down to a one-off accident. FWIW, I've always found their 4ohm midbass drivers to be pretty tight to advertised too given enough voltage drive, although I've had some more variations with some of the 8ohm versions. I still regularly use their drivers out of choice -albeit on ye long standing policy applied to all drivers of 'In God we trust. All others, we verify.' 😉
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