Fostex 126 En + Eminence Beta 12 A 2 Full Range Speaker System

Subscibe to HiFiMART Newsletter

Satyaki Banerjee

Well-Known Member
Joined
Aug 27, 2020
Messages
81
Points
53
Location
Navi Mumbai
My 4th DIY speaker design project. The Fostex 126 En driver runs full range, the Eminence Beta 12 A 2 driver fills the low frequency spectrum.

The Fostex runs in its own sealed enclosure with no crossover components in its signal path.

The Eminence gets a bass reflex enclosure with dual ports. Crossover to the bass driver is done through a Solen 6 mH inductor.

Cabinet construction and bracing using hardwood ply.

This project has been a departure from the back loaded horns that I had built earlier, and I must say the new speaker sounds brilliant.

I intend to run these speakers using Croft Acoustics integrated amplifier that should be on its way in a few weeks.

IMG-20200830-WA0005.jpg IMG-20200830-WA0006.jpg IMG-20200830-WA0010.jpg IMG-20200830-WA0007.jpg
 

yogibear

Well-Known Member
Joined
Jul 31, 2014
Messages
1,782
Points
113
Location
Jaipur
My 4th DIY speaker design project. The Fostex 126 En driver runs full range, the Eminence Beta 12 A 2 driver fills the low frequency spectrum.

The Fostex runs in its own sealed enclosure with no crossover components in its signal path.

The Eminence gets a bass reflex enclosure with dual ports. Crossover to the bass driver is done through a Solen 6 mH inductor.

Cabinet construction and bracing using hardwood ply.

This project has been a departure from the back loaded horns that I had built earlier, and I must say the new speaker sounds brilliant.

I intend to run these speakers using Croft Acoustics integrated amplifier that should be on its way in a few weeks. View attachment 49111 View attachment 49112 View attachment 49113 View attachment 49114

Excellent build, beautiful table ! What are the TSP on the Fostex ? Try active too, like Fostex driven by SS Class A or tube amp and Eminence by a high power solid state. Easy to match them too.
 

oldmonk

Well-Known Member
Joined
Aug 7, 2020
Messages
389
Points
63
Location
on the couch !
those look like large dimensions !

is this a self designed speaker or the implementation of a design that exists out there ?

nice driver selection too..

maybe you could start a company selling speakers like this !
 

shafic

Well-Known Member
Joined
Jul 15, 2012
Messages
1,288
Points
113
Location
mumbai, India.
'maybe you could start a company selling speakers like this' !

Yes. He has the capability for that.
He has made lovely cabinets like these previously too. His previous TL cabinets based on fostex drivers are also a fine example of elegance, beautiful finish and craftsmanship.
He is a quiet sort of knowledgeable DIY person. And who doesn't make much noise.
 

Satyaki Banerjee

Well-Known Member
Joined
Aug 27, 2020
Messages
81
Points
53
Location
Navi Mumbai
those look like large dimensions !

is this a self designed speaker or the implementation of a design that exists out there ?

nice driver selection too..

maybe you could start a company selling speakers like this !

Thank you for your kind comments.

While the concept of a full range driver assisted by a woofer has been around, this particular speaker is designed by me. The full range Fostex driver does not have any crossover components, the sealed chamber for the driver acts like an acoustic crossover to the woofer. The selection of woofer is important to blend properly with the speed and dynamics of a high BL low Qts full range. The Eminence drivers have light paper cones with very strong magnets, again high BL and low Qts and they blend superbly with full range drivers.

wow handsome looking speakers, lovely table as well. Any videos of them singing ?
Will post soon. Thank you for your kind comments.
 

Satyaki Banerjee

Well-Known Member
Joined
Aug 27, 2020
Messages
81
Points
53
Location
Navi Mumbai
These are the earlier 3 DIY projects that were executed by me.

The 1st project is a back loaded double horn for the Fostex 166 En driver. This is based on the Haruna design available on the Frugal Horn website.

The 2nd project is a combination of transmission line and back loaded horn loading I designed for the Fostex Sigma drivers.

The 3rd project is a back loaded horn for the Fostex 126 En driver.

IMG-20200906-WA0010.jpg photo 3.jpg Horn_Speaker03verysmall_KZI5996_AA_copy1.jpg
 

sidvee

Well-Known Member
Joined
May 14, 2007
Messages
2,972
Points
113
Location
Hyderabad
maybe you could start a company selling speakers like this !
I think he already has, wonder why no reference to these earlier posts here?:
Cheers,
Sid
 

oldmonk

Well-Known Member
Joined
Aug 7, 2020
Messages
389
Points
63
Location
on the couch !
this particular speaker is designed by me
Well done !

These are the earlier 3 DIY projects that were executed by me.

The 1st project is a back loaded double horn for the Fostex 166 En driver. This is based on the Haruna design available on the Frugal Horn website.

The 2nd project is a combination of transmission line and back loaded horn loading I designed for the Fostex Sigma drivers.

The 3rd project is a back loaded horn for the Fostex 126 En driver.

View attachment 49368 View attachment 49369 View attachment 49370
Sir

Which is your best project to date ?

I am pretty sure these speakers will be quite satisfying with a tube pre or a tube integrated amp
 

kartick

Well-Known Member
Joined
Jul 31, 2011
Messages
465
Points
63
Location
Delhi
These are the earlier 3 DIY projects that were executed by me.

The 1st project is a back loaded double horn for the Fostex 166 En driver. This is based on the Haruna design available on the Frugal Horn website.

The 2nd project is a combination of transmission line and back loaded horn loading I designed for the Fostex Sigma drivers.

The 3rd project is a back loaded horn for the Fostex 126 En driver.

View attachment 49368 View attachment 49369 View attachment 49370
Very nice builds. In the second picture from the bottom, which Lyrita equipment is it between the CDP and the TT? Is it a custom design phono amp? Looks nice.
 

Satyaki Banerjee

Well-Known Member
Joined
Aug 27, 2020
Messages
81
Points
53
Location
Navi Mumbai
It is time to start a new speaker project.

My fifth project.

I love the way my last speaker design of Full Range + Helper Bass Driver sounds, and I will take this concept further.

For the new project I will be using an Alnico Full Range Driver manufactured by a highly regarded boutique speaker manufacturer in Hungary. It's a 7in driver with a whizzer cone and a custom made wooden phase plug, cloth accordion surround. High BL alnico drive system. Sensitivity of 94 db and QTS of .3. This driver would be placed in a sealed chamber having a Q of .707.

For low frequency I will be using Eminence Kappa 15 LFA in a ported enclosure. 1st order Butterworth crossover at 250 Hz.

Lot of excitement ahead.
 

Beast_of_burden

Active Member
Joined
Jun 14, 2011
Messages
283
Points
43
Location
Bangalore
Full rangers sound best in some kind of front horn. You haven’t heard their true potential unless you have heard them in a front horn. The best full range designs were speakers that combined a front horn with a rear horn - the Beauhorn and the TP1 Isis come to mind. But the cabs tent to be deep and large. The TP1’s exponential horn is quite easy to build but the back horn can give the most ardent DIYer second thoughts. A clever designer could combine the exponential horn with a bass bin to create a truly wonderful speaker.

All the best with your build.
 

Satyaki Banerjee

Well-Known Member
Joined
Aug 27, 2020
Messages
81
Points
53
Location
Navi Mumbai
Full rangers sound best in some kind of front horn. You haven’t heard their true potential unless you have heard them in a front horn. The best full range designs were speakers that combined a front horn with a rear horn - the Beauhorn and the TP1 Isis come to mind. But the cabs tent to be deep and large. The TP1’s exponential horn is quite easy to build but the back horn can give the most ardent DIYer second thoughts. A clever designer could combine the exponential horn with a bass bin to create a truly wonderful speaker.

All the best with your build.
I fully agree. I have heard a few front horns with Lowther drivers and they sound brilliant. I had once planned to build a double mouth back loaded horn and exponential front horn. Maybe at a future date.
 
Top