Tone Tubby Alnico 12

[DUC985]

i'm planning to modify my open baffle speakers and intending to use the Tone Tubby as midrange speaker.
Currently i'm running an Eminence Beta12CX Damar coated with a B&C DE25 Compression horn driver. Basically a Bastanis Prometheus style system.
The Eminence is running full range and the DE25 is crossed over with a simple 6dB crossover at 0.8uF.
For low frequencies a subwoofer is supporting this setup until about 100Hz.
This works pretty well, but i think, compared to my Lowthers the Eminence is colouring the sound at some frequencies.

The plan is now to replace the Eminence with the Tone Tubby driver as i have only heard good things about it. Also Dick Olsher had some positv feedback with regard to Hifi sound.

Does anybody have already experience with this driver ? Any comments are welcome ...

[ScottG]

http://www.nutshellhifi.com/MLS/MLS6.html

[tinitus]

Very interesting, so maybe alnicos are worth the exstra money after all, or is it really the Hemp cone, or both

[dmason]

I would say absolutely spring for the Alnico magnets. I have a feeling you would be very happy. Consider it all a gift to Open Baffle. The frequency easily extends past the critical midband, making implementation of a simple tweeter quite easy. I am really impressed, encouraged, and motivated to try these now.

[JandG]

I have been looking hard at these for a week or so, I am a guitar player also, so not all will be lost...very intresting indeed. I am actually hinting hard for my next OB drivers to try at a 500.00 limit . these fit the bill..

[Pano]

Eminence now also have some hemp cone drivers. For example the 12" Cannabis Rex drivers.

Wonder how they compare to the Tone Tubbies?

[dmason]

Apart from a published "20db" notch before roll off I would say they are a dead match. My thinking is that with the TT Alnico, no contouring is really needed, and the Alnico magnet is the cherry on the cake, extension abit higher, roll off abit more gradual. Beyond that, TT have staked their entire future on these drivers, Eminence cannot claim such focus; as such, I see the TT as a better value, overall. Just my inclination right now.

Knowing the hemp tone, and the Alnico difference, I would say I need some of those, this is a combo that strikes me as too good to be true, --especially for the flea amp loving openly baffled, which will save anyone some bucks as well...

I am even more interested in knowing the FR of the TT Alnico 10" - still a big diameter driver for home audio, and likely to extend significantly higher than the 12, which is the intention of a 10 inch guitar speaker.

[opnly bafld]

Originally posted by dmason

I am even more interested in knowing the FR of the TT Alnico 10" - still a big diameter driver for home audio, and likely to extend significantly higher than the 12, which is the intention of a 10 inch guitar speaker.

Exactly what I thought lastnight when I was looking at the link for the 12" and I did not mind that the 10" would save some $ also.

Lin

[v-bro]

Do you mean FRoll-off or FResonant?
http://www.tonetubby.com/specs10a16.htm

Very interesting drivers by the way....

[DUC985]

good, so there seems to be some interest into that speaker.
I have ordered today two 12 inch H1E speakers. I hope to have them in the next two weeks.

So lets try to get the optimum out of it in the meantime.

Design considerations :

0. I needs to be a open baffle design
1. I want to have a small baffle., max. 1,20 x 45cm
2. I do not want to run low frequencies as open baffle
- why ? I want to meet point 1
3. I want ONE speaker to cover 100Hz - 5000Khz as this reflects most of the music information
4. I want to have very smooth high frequency extension no shooting or sharpness

#1 Should not be a problem as long as two subwoofers are used, because 100Hz is already critical using one sub. You might actually hear it.
#2 I will use one Delta 12LF in a sealed box as subwoofer per channel as i have them on hand.
#3 As i already tested the design with the Beta 12CX and this speaker already works pretty well. The choice for the upgrade is now the Tone Tubby 12 H1E speaker. You can find the frequency response on the website from Dick, see link in previous post.
For sure a kind of notch filter will be needed.
#4 The horn driver needs to cover ~5000Hz until 20000Hz.
Preferable to metal diaphragma.
Choices B&C DE25 or BMS driver have a very well reputation and are not as expensive as a TAD driver for example