Epique Tweeter!
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Interesting. Matched pairs. Big 5.1" diameter flange.
This āMatched Pairā pricing has me wonderingā¦is QC an issue on these (their past problems in this area are well documented) or are they just trying to extract a few extra $ from people?
They are using the DATS LA to match them once they come in house.
Aw snap! Looks like they are dipping into the melodavid stuff!
As far as matched pairs.. I figure it is something that has been requested quite alot so they are doing what they can to oblige.
Wow, that FR is pretty incredible. It looks like a larger TLabs dome without the second magnet. Not sure about the Z bump at 2.2kHzā¦.
Well, whoās going first?
What does the Z bump signify? Still not sure about how impedance effects on overall design other than there is a consequence to current draw.
Itās about time they added a tweeter thatās higher up the food chain. If I didnāt have about 20 projects going on right now, Iād grab a pair.
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It would be an indication of a resonance somewhere that is placing force on the diaphragm in that frequency range, which then translates to the voice coil.
Typical voice coil based speakers are linear electric motors. Outside force moving it will impart a voltage across the voice coil, just like many axial rotation electric motors can act as a generator if you apply torque to the shaft. This voltage works against the amplifier, so the amplifier sees an increased impedance to the current flow when the resonance is occurring.
It isnāt always a super bad thing, but outside forces on the diaphragm are not part of the recording. So this can be measured as distortion.
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If I get a job, maybe Iāll order a pair. Price is right.
Sup fellers.
Yāall are quick at the trigger. I just released these things two days agoā¦
The matched pairs were an early choice in the development process. It has nothing to do with QC issues and everything to do with tighter tolerances that a lot of people look for in a higher end tweeter. Not everyone needs a pairā¦ so we offer both options. They are matched and packaged this way from the factory. The matched sets include a ābirth sheetā with overlaid responses.
I appreciate pointing out the impedance curve. That is actually the wrong curve from an earlier sample and I glossed over it before the final release. Iāll have this updated tomorrow. I worked hard to mitigate that as much as possible.
If you try out a pair keep everyone posted and donāt forget to leave a review (good, bad or otherwise)!
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Good to hear that the possible Zbump is not there.
Thanks for the info, Matt!
I think the new Dayton CF tweeters look interesting too, Iāll snag a pair for testing, I think.
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@Mattp - consider not presenting the impedance on a log scale, which kind of magnifies the issue. Unless that is a new standard for PEā¦ I see the Reference tweeters and DC28F are plotted with linear scales. (Iād suggest the same for the CF18N, although once it is out there for a while it my be sketchy to change it.)
As a DIYer who prefers useful charts and graphs, please use log scale for impedance so that āissuesā are not hidden by poor data presentation. Also consider 25dB/oct scale for frequency response for the same reason.
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The workorder has been sent for the spec sheet, give it a couple days to be updated.
I ordered a matched pair of the Dayton CF18. Iāll post data after I measure them.
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I bought the matched pair of the CF tweeters at SDC, mainly out of interest to see how matched they actually were. It will be months before I use them however.
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The Signature series of subs are available. Look pretty good.