Tone Tubby Alnico-Hemp driver: Would this work for me?

grubyhalo

grubyhalo

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Hi all,
I came across the Tone Tubby recently and have been reading up a bit on them. I am very much enamored by all the positive comments about how excellent it sounds and it's gorgeous tone. I am wondering if the Tubby (10" or 8") could work as an extended midrange and if a 3-way could be built around it. The following are the parameters for the 10" 8 ohm and 16 ohm models:

Tone Tubby 10" 8 ohm

Voice Coil Impedance: 8 ohm
Rated Frequency Response: 100-5KHz
Sensitivity (dB SPL 2.83V@1M): 100
Rated power: 50 Watts
Magnet Weight: 1417.5g
Fo: 120Hz
Re: 6.7 Ohms
Qts: 0.51
Qms: 10.3
Qes: 0.53
Vas: 25.7 Liters

Tone Tubby 10" 16 ohm

Voice Coil Impedance: 16 ohm
Rated Frequency Response: 110-6KHz
Sensitivity (dB SPL 2.83V@1M): 97
Rated power: 50 Watts
Magnet Weight: 1417.5g
Fo: 130Hz
Re: 14.2 Ohms
Qts: 0.75
Qms: 11.3
Qes: 0.8
Vas: 23.1 Liters

I have requested the specs. for the 8", but have not received them yet.

I understand that a lot of simulations and trials would be needed to determine the optimum design, but I am looking for some assistance in understanding if the idea I have in mind would work at all. The basic idea is to have the Tubby handle 200Hz to about 4KHz with a tweeter (horn? ribbon?) and a woofer (sealed? ported?) helping out at both extremities. I have a bunch of questions, some basic, some stupid and some falling between the two. :D I'd appreciate much if everyone could comment, advise and enlighten me on this:

1. Would it be a wise choice to have the TT handle the band between 200Hz and 4-5KHz. I was thinking, this way, the cross-over could be kept out of the problem region.

2. What cabinet design would work best for the TT? Sealed? Ported? OB? I'm thinking since they have a high Qts, it may not work in a sealed cab...

3. Since the 16-ohm version has a high Qts, would this be suitable for an OB design?

4. If either of the drivers would work in an OB, could the LF be handled by a sealed cab (with 2X8" woofers)? A couple of speakers that follow this design are the AV123's X-Statik and the Bastanis Prometheus MKII:

066938bb5f115ab5b2f0b6f6b833b095.jpg


prometheus_300.jpg


It would be great if a compact OB design without too many compromises could be achieved.

5. I'd also like to find out if a plate-amp (with a cross-over) could be used for the LF part and a passive x-over between the tweeter and the TT. If this would not work, I guess I'd have to look at a full-blown active option using the DCX2496...

The following are some of the links about the TT that I found interesting:

The 12" Alnico Tone Tubby

Tone Tubby alnico hemp drivers

Tone Tubby Alnico 12 - diyAudio

Thanks for taking the time to read this long post, I appreciate all your comments and thoughts. :)
 
Hi Cranky,
Thanks a ton for your feedback. BTW, I just got the specs for the 8's and have posted it at the bottom of this post. Do you think there would be a lot of beaming with the 8" too? Can I get away crossing the tweeter in at around 4K if it's an 8"? I guess I'm trying to see if I could use the TT as a quasi-full ranger. How is the beaming controlled in large FR's? The reason I was thinking of using a sealed woofer section is to see if it would make it a little easier to integrate the speakers in a small room. I am planning to have these run in a 12X18 room for now and I may have to move it to a 9X12 room later on. The maximum space I could afford behind the baffles is about a foot and a half from both the back and side walls. If this setup would not work at all in a small room, I might just have to go with GR Research's N2X bookshelves. However I'm smitten by the thought of having an OB, especially using a pro-driver and particularly the Tone Tubbies. Thanks again for your time and advice, sure appreciate it. :)

DESCRIPTION 8" ALNICO 4 OHM
Voice Coil Impedance: (ohms)4
Rated Frequency Response:100 - 9,000
Sensitivity (dB SPL 2.83 V @ 1 M)98
Rated Power (Watts)25
Program Power (Watts):50
Magnet Weight (Grams)200 (7.05 ounces)200
Net Weight (kG)1.1
Fo (Hz)150
Re (ohms)3.3
Qts:1
Qms:13
Qes:1.1
Xmax (mm)0.5
Vas (Liters)14

DESCRIPTION 8" ALNICO 8 OHM
Voice Coil Impedance: (ohms)8
Rated Frequency Response: 100 - 9,000
Sensitivity (dB SPL 2.83 V @ 1 M) 97
Rated Power (Watts)25
Program Power (Watts):50
Magnet Weight (Grams)200 (7.05 ounces)
Net Weight (kG)1.1
Fo (Hz)150
Re (ohms)6.8
Qts: 1.7
Qms: 10
Qes: 2
Xmax (mm) 0.5
Vas (Liters) 14

P.S: From what you say, it appears that I would save a lot of pain if I just go with the DCX...
 
Thanks for the explanation, that clears quite a few misconceptions I had in my head. I guess I'll just build the N2X kit first and then just buy a couple of TT's and play with them in different configurations. Thanks again for your time and answers. :)
 
grubyhalo said:
Hi Cranky,

P.S: From what you say, it appears that I would save a lot of pain if I just go with the DCX...
Click to expand...

Hi,
I have been doing a lot of research for my active tri amped project.I would give a second thought to using the DCX2496 .I have spoken to a few people who have used this and there are some problems ,outlined below :-
a)behringer does not have a good service backup
b)the DCX apparently does not have enough computing power to run more than one eq on each channel.

IMHO the DCX seems like the jack of all trades but the master of none.Good value for the features but poor execution.

Also look at the DBX PA+ ,if you have a little more to spend look at the DBX Driverack 260.If you have still more to spend look at the Electro Voice DC-one and the Ohm professional Cleo MKII .Still more to spend (Lakh plus) look at the Lab Gruppen LM26,BSS Minidrive,Ohm audio Cred.At the top end we have the DEQX :)

Generally service availability for Harman group products (DBX,BSS) would be better ,should anything go wrong.

Overall I think this is a neat project.I wish I would have come across the TT's before ordering my drivers,anyway next time! Yay for DIY.
 
Adhiraj said:
Hi,
I have been doing a lot of research for my active tri amped project.I would give a second thought to using the DCX2496 .I have spoken to a few people who have used this and there are some problems ,outlined below :-
a)behringer does not have a good service backup
b)the DCX apparently does not have enough computing power to run more than one eq on each channel.

IMHO the DCX seems like the jack of all trades but the master of none.Good value for the features but poor execution.

Also look at the DBX PA+ ,if you have a little more to spend look at the DBX Driverack 260.If you have still more to spend look at the Electro Voice DC-one and the Ohm professional Cleo MKII .Still more to spend (Lakh plus) look at the Lab Gruppen LM26,BSS Minidrive,Ohm audio Cred.At the top end we have the DEQX :)

Generally service availability for Harman group products (DBX,BSS) would be better ,should anything go wrong.

Overall I think this is a neat project.I wish I would have come across the TT's before ordering my drivers,anyway next time! Yay for DIY.
Click to expand...

Hi Adhi,
Thanks for the inputs, appreciate it. I did read up a bit on the PA+ and 260, but they are currently way out of my reach and I fear might be an overkill for someone like me. Eitherways since it is pretty certain that an OB would not work for me at the moment, I'm not going to pursue this project at this time. But I'm definitely going to get myself a pair of TT's to play around with sometime in the future. Good luck with your project!
 
looks like a fascinating project grubyhalo! will be following to see how the final speaker sounds! all the best!
 
Grubyhalo,

I am in the process of planning a OB and Tone Tubbys were on top of my list, till I looked at the pricing. The Alnico models are quite expensive, therefore I started looking at other options including Martin J King's designs based on Eminence Alpha 15. I am currently dealing with same problem - how to avoid beaming around 1K and up. I would like to avoid a midrange and go straight to a HF horn (I am also in the process of refurbishing a Altec 811b).

I am not yet clear in my mind, but certainly would like to have a Behringer on my side when trying to work things with a OB.

The other option is to passively cross over a TT or a Alpha directly to a Fostex full range a-la Martin King's design....and avoid a HF driver.

Too many things to ponder over....

Cheers.
 
Hi Anil,
I think I remember seeing your posts in a DIYA thread about Eminence Cannabis Rex. :) Well, this might just change your mind if you're not too worried about using an 8":

South Valley Vintage Amps - Online Store

It costs less than a 3rd of the price of a 10" or a 12". I have posted the specs for these in one my earlier posts in this thread. Let me know what you think. I guess a compression driver with a nice horn would make sense above 1.2K-2KHz. The only time I heard a horn in a hi-fi environment, I liked it very much. :D Ofcourse, a DCX and MJK's worksheets seem to be necessary tools if you're just starting out to make your own speakers.

BTW, if I may ask, what's you budget for this project?
 
grubyhalo said:
Hi Anil,
I think I remember seeing your posts in a DIYA thread about Eminence Cannabis Rex. :) Well, this might just change your mind if you're not too worried about using an 8":

South Valley Vintage Amps - Online Store

It costs less than a 3rd of the price of a 10" or a 12". I have posted the specs for these in one my earlier posts in this thread. Let me know what you think. I guess a compression driver with a nice horn would make sense above 1.2K-2KHz. The only time I heard a horn in a hi-fi environment, I liked it very much. :D Ofcourse, a DCX and MJK's worksheets seem to be necessary tools if you're just starting out to make your own speakers.

BTW, if I may ask, what's you budget for this project?
Click to expand...


Yeah! one of the posts in DIYA was raving about Cannabis Rex. Seems like good value for money. The other option is Eminence Canis Major (again a Hemp cone, but is as pricy at TT and a Alnico as well). The Eminence dealer in Chennai does not have any one of these...Getting it from US seems to be obscene in terms of shipping charges.

I will check the option you mentioned. As far as budget is concerned, I do not have one, but do not want to go overboard either....Anyone knows if Beymas are available in India?

Thanks.
 
Anyone knows if Beymas are available in India?
Click to expand...


Hi,


GM Audio are/were selling them in Madras .They had these drivers a few months ago when I visited their office.

http://www.gmaudio.com/products.htm


Actually a lot of theaters/PRO AUDIO guys bought Beyma drivers as they were cheaper than the JBL 2445/6 two inch exit drivers,even the replacement dias. are less expensive.


Regards
Rajiv
 
Last edited:
anilva said:
...As far as budget is concerned, I do not have one, but do not want to go overboard either...
Click to expand...

So, do you think the 8" at $90 makes sense to you? I've been reading up a bit on CD-horn combos and read decent results using the following combos...

B&C DE10 is a 1" high frequency compression driver- B&C DE10 high frequency drivers - B&C 1" high frequency driver for speaker systems. B&C DE10 high frequency drivers available now. with Eighteen Sound Speaker Horns - Eighteen Sound XT120 - Eighteen Sound XT120 horn. Eighteen Sound XT120 horns are available here. 18 Sound speaker components.

B&C DE250 is a 1" high frequency compression driver- B&C DE250 high frequency drivers - B&C 1" high efficiency high frequency driver for speaker systems. B&C DE250 high frequency drivers available now. or Beyma Speakers - Beyma CP380M - Beyma CP380M 1" high frequency compression driver. Beyma CP380M 1" high frequency compression driver is available here. Beyma speaker components. with DDS Waveguide Horn - DDS CFD ENG 1-90Pro Waveguide Horn - DDS CFD ENG 1-90Pro Waveguide 1" 90 x 90 fiberglass horn. DDS horns available now.

I'm guessing Rajiv might have more useful information on CD's and horns. :D
 
HI,

Arguably the best woofers for open baffle.The dipole range from AE speakers.


AE Speakers --- Superb Quality, Unforgettable Performance, Definitely.

AE Speakers --- Superb Quality, Unforgettable Performance, Definitely.

AE Speakers Online Store


The Dipole 12 are used in the $110,000 plus Granada loudspeaker.

The Granada Loudspeaker

I belive that Nick Mcinney of Lambda loudspeakers had a hand in designing these drivers.

Aks07 on our forum has a subwoofer using the Lambda driver.

Owning the Feastrex drivers is something that I can only dream about.

However it is possible to use other good fullrange drivers from Fostex,Lowther ,Fertin,Supravox etc. and build a very good loudspeaker.

Maybe one day.;) when I am done with the several pending projects which are in various states of completion.

Regards
Rajiv
 
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