Good tweeters to cross low, at most 1500 Hz

[otto88]

Hi,

To cross to a Seas Excel mag cone midwoofer, whose performance should be great up to 1000 - 1200 Hz, when cone effects start to become evident, I'm looking for tweeters to cross low, at 1500 Hz or maybe less.

Options to cross low, from http://ldsg.snippets.org/sect-7-tweets.php#TWEETS-3/4

Hiquphon OW1 Fs 850 (or 650?), Xmax a big 0.9 mm c $110 each

Seas 27TDFC Fs 550, Xmax only 0.25 mm. only $30

Morel ferrofluid MDT20, or 22: Fs 650, Xmax 0.5 mm. only $33 (eg from Zalytron)
http://ldsg.snippets.org/vendors/morel.php

Human 002M: Fs 1300, but Xmax a whopping 1.5 mm. only $48

Scan Speaks seem pricey, Usher wont cross that low.

Another Seas or a Vifa??

What do you recommend?

Thanks

[Ed LaFontaine]

Seas TBFC/G H1212 (metal dome)
Seas also has "waveguide" tweeter that Madisound will be stocking shortly...
You may want to investigate "cauer-elyptic" crossovers for 8th-order emulation. REAL steep.

[y8s]

be more cautious of the distortion down that low than of the Fs.

Pretty sure even with the low Fs, the Hiquphons should stay above 2500 with a 2nd order crossover.

[Paul W]

Seas T29MF w/Xmax of .7mm may be a good match for Excel midwoofers.

I have the 3/4" Hiquphons and would recommend them below 3k only at low SPL, at least 2nd order.

[454Casull]

Have you looked at the Linkwitz Orion?

[BHTX]

Originally posted by otto88
I'm looking for tweeters to cross low, at 1500 Hz or maybe less.

For crossing that low, horn loading or waveguides are probably the only real possible option, and even then, I think that's still probably pushing it a bit. Regardless, these designs of course create another whole set of obsticles, adding difficulty to the design. Other than that, you're looking at compression drivers, or some other entirely different technology all together, which would obviously change the whole project and design goals (i've never heard of pairing a pro compression driver with a Seas Excel midwoofer, lol). On the other hand, I'd be looking at widerange planar transducers if I were you. BG Neo8 or Neo8 PDR comes to mind. Highpass it as low or high as you want, run it dipole if you want, lowpass it to your tweeter of choice at 7-10 KHz, or whatever you want. You might already be aware of all this though. I just don't think you'll ever find what you're looking for in any small soft dome tweeter for hi-fi. Sure, there's quite a few that CAN do it, but I'm sure it'd definitely require some effort no matter what, and even then, I don't think any results obtained would be considered anywhere near optimal. Distortion sets in, limited SPL, dip in freq response at the xo point, etc etc.

[Dave Bullet]

The northcreek D25.... has the xmax you are after - $36 per pair if you can get them.

[Jay_WJ]

Originally posted by Ed LaFontaine
Seas also has "waveguide" tweeter that Madisound will be stocking shortly...

I think this is the way to go. Easier and right price.

[DSP_Geek]

Out of curiosity, which midwoofer were you planning to use?

[BHTX]

Originally posted by Ed LaFontaine
Seas TBFC/G H1212 (metal dome)
Seas also has "waveguide" tweeter that Madisound will be stocking shortly...

This one, right?
http://www.seas.no/images/stories/pr..._datasheet.pdf

..I agree. It does look very doable with a steep slope.
I guess it's just a personal thing that 1.5 KHz from a 1" dome tweeter just doesn't seem right to me. I've never tried it myself tho, so I can't really say. I'd definitely be interested to hear about it when it's finished, regardless of which tweeter you end up using. Goodluck.