Tone Tubby Alnico 12

[tinitus]

Who said Emminence with HEMPcone

some of the most interesting exsamples - just to see what to expect from a standard 10" with Hempcone

http://www.partsexpress.com/pe/pshowdetl.cfm?&PartNumber=290-516

http://www.partsexpress.com/pe/pshowdetl.cfm?&PartNumber=290-828

 

[v-bro]

Cool drivers, but I don't think they'll be as good as the tone tubbys for use in OB without eq....the Qts is much lower so they'll roll-off much quicker in the lows... I don't expect much of the higher freq. response either, they'll both need a tweeter with pretty low x-over point (at least within the sensitive part of the average human hearing curve)...

Thanx for the links anyway, on behalf of the people who want to build a better guitar amp...or don't mind to crossover within the 'sensitive region'.

 

[tinitus]

That would be my point excactly

Fore a 2-way OB I think I would try the 10" TT, mostly because of its very high Qt and weaker motor, indicating a lower Le with wider FR, and mostly lower SPL means relative more bass - but pure speculation

but it will be essential to use two tweeters, one on front and one on back, with reversed polarity - could be conetweets

 

[v-bro]

Or an OB tweeter (dipole) like an ESL or ribbon right? I think if you take off the chamber from a dometweeter with drilled polecore/dampened chamber it can also be used as dipole, not?

 

[tinitus]

Yes ofcourse, I forgot that option - but it might upset Fs resonance and have others kinds of unwanted resonance, but worth a try

I have an idea about having tweeter playing upwards (omni..?), but from about 10khz only

Maybe we could make a omni directional dipole

 

[tinitus]

Just a silly idea

 

[Pano]

Just a silly idea

You know what that reminded me of?

Have you ever seen those double dish mirrors that make an object appear to float above it? A very cool illusion. I saw it done on a larger scale at Infocom one year, a whole CRT screen. Very weird, looked like a projected hologram.

Wonder if you could do that with sound?

Sorry, kinda OT.

 

[planet10]

Just a silly idea

Not silly at all. There are quite a few examples in the field, and some of them are very good.

dave

 

[tinitus]

Thanks, yes I know there exist some very exotic examples

I just thought about how to owercome some of the problems in a 2-way, this being a fullrange forum, and possibly at the same time deal with the issue that the TT is a dipole driver only

I would think that soundstage in a dipole and omni directional is very similar, or...?

 

[v-bro]

Nope, I guess not, a dipole radiates a pattern shaped like an eight (seen from above) the one half of the eight radiates in a reversed phase and therefore you get bundled sound...the omni is a dispertion system radiating a positive phase in a 360 degree horizontal direction....

 

[tinitus]

I knew that too, but point is, how does it sound; thats what I am interested in

And with this you have to consider that the TT is playing upwards and horisontal 360gr. in phase, and downwards out of phase with a 360gr. radiation too - how to model that

 

[v-bro]

Both designs probably don't combine well for practical reasons. A cone tweeter in omni added to the TT in dipole came up in my thoughts, but where can the omni radiate 360 if the baffle of the TT is standing in it's way? I suppose the TT would need quite a large baffle to produce bass in OB, like any bassdriver in OB...(meaning the short-circuit point of the front and rear wave) despite it's high Qts, which offcourse helps a bit...

Than placing the TT in an omni seems crazy to me.. Or do I understand you wrong? Did you mean placing the TT in an omni without enclosure?

"The OBOMNI"

 

[tinitus]

Hi, sounds like you have missed my drawing in post 26

Box is totally open at the bottom, and I think the TT is made for this kind of enclosure


BTW,...just read about some country fellowmen testing the 12" TT Alnico as guitar instrument speaker.... they found it to the very best, and it could play impressively loud loud too ...so, they dont "lie" about it

 

[v-bro]

Ah, yes ok uh....is it open down there or closed?

Maybe the TT CAN be used that way (either way...)

 

[tinitus]

Its open at the bottom

.... the "legs" are diagonal plates inside the box ..... with cutout holes, and will act a bit like matrix, and devide the inside into four triangulars

I think it looks very vintage

 

[v-bro]

It does, I like it!

 

[Telstar]

Two years passed... anybody actually ordered and used the TT in OB?
I'm considering the 10" + a nice tweeter.
If somebody used it, a frequency response graph would be useful.

 

[nullspace]

I've had pretty decent results with them.

Thread on my TT project.

ScottG posted a link to LO's measurements of the TT12 in post #2 of this thread. I have a bunch posted at my website, but his is probably more representative -- mine have a pretty short window (4-5ms) since I was only worried abount getting enough data in order to model the crossover.

Regards,
John

 

[Godzilla]

Neat stuff on these TT drivers! The Eminence just don't seem quite right when looking at their frequency responses. The lil buddy seems best to me but doesn't extend far enough smoothly for me to purchase them. Looks like they will work on OB nicely tho.

Also, on these compression tweeters besides a capacitor (i did not read the entire article) is an L-pad being used to attenuate?

>>> "The midrange is where we live." - Paul Klipsch

Didn't PK also say something about ragged frequency response sounding more 'exciting' than flat? I remember seeing a quote about that i thought was interesting. Anyone know what it was?

Godzilla

 

[Telstar]

>>> "The midrange is where we live." - Paul Klipsch

Didn't PK also say something about ragged frequency response sounding more 'exciting' than flat?

I don't know, i prefer it flat.

PS: needing data on the 10" TT.