Look at my new babies...Altec 846Bs w/EV Tweeters!

[avguytx]

psst.....

Hey Storm....

not all watchers on auctions have intentions of buying....

some are merely tracking various goods run through ebay....

True...I just wanted to see if someone would actually pay $1250 for them...and they didn't. A grand is still good, though.

[Shane Shuster]

I could certainly see that if it was just to add sizzle. Vals need more than just that, tho, apparently.

Other than testing some for Johnaec one day, I have no experience with them, and certainly don't know how to control or integrate them.

Same with running a dome tweeter on top of a compression driver -- uncharted territory for me, alas....

Have you thought of trying a planar tweeter?

1. They come in efficiency's that match a Valencia without padding them down.

2. The range you will be using them allows you to skip past most of the things ribbons have trouble with.

3. The depth on them is very thin. They should be easy to mount to a Valencia with out cutting the foam and they won't plug up the port.

4. You would probably have slightly better off axis response.

5. If you have never run one on top of a compression driver, here is a chance to learn.


Obviously there would still be some drawbacks that you would have to work out.

[Tom Brennan]

Zilch---I've a pair of these Hi-Vi planar tweeters with a claimed sensitivity of 94db. If you want to experiment with them PM me and I'll send them to you.

I used to use them to augment the highs on my 605s, I brought them in around 10-12khz. They sounded good to me but drove my wife nuts.

[Zilch]

This is obviously a conspiracy masterminded by Mr. Widget -- y'all are determined I should have every variety of tweeters to play with here.

I've PM'd appropriately.

Moldy: What particular car tweeter are you suggesting, please?

[Steve Schell]

Jeez Tom, what the hell is that sitting on top of your speaker? Looks like Ray Walston .

[Zilch]

The 811 horn is mounted on a brace 2 1/4 inches behind the woofer mounting baffle.

ACK! I didn't know the recess was that deep.

I was thinking more like slide the horn over ~1" to create a 2" space outside of the horn permitting recessing a rectangular tweeter like T-35, K77, or C125 in there.

That's still workable, but you couldn't get the grille on, looks like.

Integrating the tweeter into the horn deserves further consideration. I'm now looking at exploiting the "cup" behind the face, maybe, at the lower lip. I'll have a horn next week to help with that.

[ KISS that baby!! ]

[Fred Sanford]

Jeez Tom, what the hell is that sitting on top of your speaker? Looks like Ray Walston .

Looks to me like a collection of old microphones, or parts of them.

je

[clmrt]

I think ZZ Top uses those Mic bodies, loaded with Shure elements.

Old EV?

And did you blu-tack the tweeter's legs to the cabinet? My audio OCD would have mandated it. Great idea using those.

Does your wife have an opposition to the looks or the sound?

[Tom Brennan]

Steve----That's a scuplture a pal made, it's called "Mike".

CL---My wife hated the sound, she's very sensitive to any shrillness at all. Klipsch Heresys gave her an earache, literally, no lie, an actual earache. However she didn't think the Hi-Vis were near as bad as that and I thought they sounded nice, whereas I also came to the conclusion that the Heresys sounded like Skilsaws.

I was going to do the job on those 605s; get a good active crossover like an Ashley or TDM, new diaphragms (Shawn Fogg reported much improved highs with old 288s by replacing diaphragms) and EQ for the top end. But then I came across some Nineteens so the 605s went on the back burner.

[moldyoldy]

...

Moldy: What particular car tweeter are you suggesting, please?

One of these two;

http://www.jbl.com/car/products/cate...=US&Region=USA

I've got a pair of the MyTis in the truck, which isn't a far cry from holding a pair at arms length to listen...nasty tweeters are more than noticeable in those conditions, but I've got no complaint. The 92dB/2 ohms doesn't immediately bring a good passive XO to mind though...

I'll have to retract my observation of flat baffles, looks like A and B are both stepped, sorry.

From previous personal attempts at coax horns, I've learned a few "musts";
a. The inner unit must present a smaller cross-section than the shortest wavelength produced by the outer.
b. The inner unit should occupy <25% of the outer unit's mouth area.
c. Reflections from rear of inner unit must be eliminated, either by placement/distance or absorbtive materials.
d. The inner mouth should extend slightly beyond the imaginary spherical mouth of the outer, i.e. get the delicate 'fram out of the high-pressure zone.

*Tech note PD-2 offers good insight on coax horns;

http://www.jblpro.com/pub/technote/P...20TechNote.pdf

My results using commercially-available horns were largely disappointing, though I still believe a ground-up approach could yield outstanding results. I suggested the car tweets only because the size diff from the 811 is so great it might just work.

[Zilch]

Thanks, Moldy, especially for the design guidelines.

[Fred Sanford]

This is obviously a conspiracy masterminded by Mr. Widget -- y'all are determined I should have every variety of tweeters to play with here.

I've PM'd appropriately.

Got the blue grille cloth, thanks Zilch. Did you receive piezo tweets?

je

[Zilch]

Got the blue grille cloth, thanks Zilch. Did you receive piezo tweets?

Not yet. May be at the P.O., though.

If you look closely, you'll note there's a shiny side and a wooly side to the cloth. Wooly side out....

[Zilch]

EV T35B (thanks to Jack Giff and Storm,) and Crites (seems to be a Klipsch improvement guy) CT125.

Compare T35 here:

http://audioheritage.org/vbulletin/s...9&postcount=77

and here (bottom):

http://audioheritage.org/vbulletin/s...&postcount=115

Yeah, yeah, I'll start another thread. Just wanted to tease a little.

[And let you know I wasn't snoozin' on this.... ]

[jackgiff]

Hi Zilch,

In a couple days I will be able to send you a pair of Eminence APT-80's, if you care to test them. They should be better than either the T35B or the Crites, if you want to believe Eminences figures.

Let me know.