C-Audio?

[Jonasz]

Does anyone know something about these tweeters i spotted on the bay? Looking at the pics they seem very nicely built, especially for the price! :P

Aludome
http://cgi.ebay.co.uk/Aluminium-Dome-Tweeter-1-PCS-Excellent-High-Frequency_W0QQitemZ250570934867QQcmdZViewItemQQptZ Speakers_Subwoofers?hash=item3a57310a53#shId

Titanium
http://cgi.ebay.co.uk/Titanium-Dome-Tweeter-1-PCS-Excellent-High-Frequency_W0QQitemZ250572156692QQihZ015QQcategoryZ 3276QQssPageNameZWDVWQQrdZ1QQcmdZViewItem#ht_4775w t_1172

[Space]

This is interesting. They are shipping directly from China and ask $11.50 for that, more than the cost of the tweeter. These tweeters look like an amalgam of familiar parts. Maybe the manufacturer is using the same sources for sub-components that go into Seas and Scan Speak tweeters. Funny how that works, it makes it easy to develop clones of major brands.

[numberoneoppa]

Wow, those look crazy good for the price. Maybe I should buy all of them and resell them to you guys for a good markup. :3

[JonMarsh]

There you go, be an entrepreneur. The response curve for the Titanium version seems too good to be true from what I know about usual titanium dome breakup modes. It looks like the magnet system from the Vifa made for Hales, including the copper Faraday ring, with a mounting plate and dome taken from an MB Quart. And a 1" aluminum dome tweeter with a breakup mode at ~40 kHz is a skosh improbable.

but, who knows? You buy them for what they charge, measure and verify them, and you could get 4x what you pay...

[numberoneoppa]

Anybody want to buy me a measurement mic? I have the other required equipment. I'll do the measurements for you so you don't have to risk the purchase!

(It can't hurt to try </poor_college_student>

edit: Got trigger happy and purchased a pair of each. No idea why.

[cjd]

Send 'em over I'll measure and return 'em.

[numberoneoppa]

Send 'em over I'll measure and return 'em.

It can be done!

[Jonasz]

Send 'em over I'll measure and return 'em.

Cool, very interested to see the result! :P

[numberoneoppa]

Waiting on a response for combined shipping because I sure as heck am not paying 40 dollars shipping for four tweeters unless they're from the ISS.

update: price worked out, should be shipped soon~

[numberoneoppa]

Still looks like another two weeks for the tweeters to arrive. A slow boat from China.

In other new, two more tweeters have been added to the lineup:

NEO Silk Dome Tweeter (sold individually)
These look really nice.





and

More silk dome tweeters (sold as pairs)

[Kevin Haskins]

I like this part of their advertising.

But be notice that Intemational shipping usually take longer than dogmatic, it base shipping service provider and customs.

[evilskillit]

I like this part of their advertising.

But be notice that Intemational shipping usually take longer than dogmatic, it base shipping service provider and customs.

heh, www.engrish.com thats all I've got to say.

[numberoneoppa]

I like this part of their advertising.

But be notice that Intemational shipping usually take longer than dogmatic, it base shipping service provider and customs.

Saw this this morning and I laughed my ass off, honestly. =)

[numberoneoppa]

So the tweeters actually ended up showing up on Wednesday. They look pretty nice! The quality definitely seems present. All metal faceplate and nice mesh over the dome, just like in the pictures. Now here's what is strange: the Ti dome tweeter has a part number of C25T0907 and the Al dome tweeter has a part number of C25A0907. All four of my tweeters looked identical at first look and yeah, they had the same part number on the sticker! However, upon closer inspection, I noticed that only two of them had a foam gasket under the flange/faceplate. Maybe these were different. Indeed, if I looked at them in the light, the dome was actually a slightly different colour than that of the other two tweeters. Now the issue is... which one is which? I guess we'll have to leave that to cjd's testing and some graph-matching.

I emailed ZT Chen (C-Audio sales) about this and he said "must have been the wrong sticker". While somewhat bummed about a huge oversight, I'm really not that upset about it. If you go and look at the ebay page for the Aluminum tweeters, you'll see that the picture features the improperly labeled Al drivers.

I have many pictures to share, but I am away from home and won't be back for a week. When I get back, I'm going to send the drivers to cjd for measurements.

=)

[SoundOfNothing]

So the tweeters actually ended up showing up on Wednesday. They look pretty nice! The quality definitely seems present. All metal faceplate and nice mesh over the dome, just like in the pictures. Now here's what is strange: the Ti dome tweeter has a part number of C25T0907 and the Al dome tweeter has a part number of C25A0907. All four of my tweeters looked identical at first look and yeah, they had the same part number on the sticker!
=)

I don't get what's strange. Per your description, the Ti tweeter is C25T0907, the Al is C25A0907. Are you saying they all had the same sticker = C25A0907?

[numberoneoppa]

I'm saying the all had the part number C25T0907. =D

[Shonver]

Any impressions regarding performance of these tweeters?

[numberoneoppa]

Any impressions regarding performance of these tweeters?

Nothing yet. Still waiting.

Some pictures, though! Sorry, no resizing... I need to reinstall Photoshop.

Anyways, I was very impressed with the shipping, the packing seemed simple, yet sufficient. Maybe the PE guys could learn something from this after their recent Vifa fiasco.

Images not available

[evilskillit]

Holy Moley! If you use something like picasa or imageshack or most other image hosting services they can downsize the image for you up on upload.

[Shonver]

Thanks. Would you mind shrinking those pics pics a bit, though?

[numberoneoppa]

Holy Moley! If you use something like picasa or imageshack or most other image hosting services they can downsize the image for you up on upload.

Good point. I'll do this in a few and edit my post.

edit: Done!~

[Ray Tremblay]

Have you sent these to be tested yet?

[cjd]

Have you sent these to be tested yet?

Yes...

I am hoping to find a little time to run some tests on these this weekend while it's raining outside.

[Space]

That package looks like a loaf of tweeter bread! One of my favorites.

[numberoneoppa]

That package looks like a loaf of tweeter bread! One of my favorites.

Mine, too!

[cjd]

In progress. Will need to think about whether to post/share the results broadly or not.

update: silly me, I was basically measuring the MIC distortion. I forgot to do a level check and wasn't paying proper attention to things - the ears on and I hear basically nothing anyhow. Oops. So I'll have to re-do all this.

[Shonver]

Will need to think about whether to post/share the results broadly or not.

What are the (your) issues?

[numberoneoppa]

In progress. Will need to think about whether to post/share the results broadly or not.

update: silly me, I was basically measuring the MIC distortion. I forgot to do a level check and wasn't paying proper attention to things - the ears on and I hear basically nothing anyhow. Oops. So I'll have to re-do all this.

Hah, well done. :P

[cjd]

So... not really sure yet about distortion, but impedance and response to 20kHz looks quite similar to what they posted... the thin steel face and no screw recesses make me think that they, like I, found it sensible to just surface mount to measure.

I need to figure out what I forgot on distortion data besides level.

[numberoneoppa]

Can you test to 30-40KHz by chance?

[cjd]

I don't think my mic is good that far but I'll see how it goes.

[cjd]

Sigh. I'm still skeptical. I ran numbers on the RS28F and ND20's I have as well just to try to bring some sanity, but that hasn't really settled my concerns that the data is all wrong, even though the ND20 is very much trending just like the data Zaph has posted on this tweeter (I didn't find similar numbers on the RS28F to compare)

Here are impedance measurements, FR measurements at 1 foot. Tweeters were surface "mounted" - that is, they were stuck in a snug fitting hole but weren't screwed down. Baffle 18" wide, 9" from top. I tried to keep everything exactly the same measurement to measurement but probably wasn't 100% perfect.

Also attached is distortion data from the Dayton ND20FB. I tried to scale it and such so it's a direct match for Zaph's data.

[SoundOfNothing]

Any luck getting distortion measurements? The distortion posted for the ND20 looks too low. Dont throw the towel in :T

[cjd]

If the ND20 looks low, the data I have is probably junk. Or similarly low. It has to do with the level in part, I believe, so that may be partly why the ND20 is low.

[numberoneoppa]

Thanks for the measurements! I'm interested in reading what some others think about them. =)