A thread for Tysen and variations on FAST

[rjbond3rd]

Check this page: MathCad Computer Models : Upgraded Versions

[ljfont]

Originally Posted by Geek

So, what's the secret handshake to get at these worksheets. They aren't on his site

Cheers!

Get the license $25. Well worth the money. You can join his yahoo groups and he provides excellent support.

[ljfont]

Originally Posted by planet10

For midrange use the stuffing gets denser as you approach the terminus, with almost none right behind the driver.

dave

How dense is dense? How dense is 1lb/ft^3 ? How do you estimate this when you're actually stuffing a box?

I've just been goin by ear to what I like then measuring afterwards.

Thanks,
Leo

[planet10]

I use experience and play until i'm happy. Quite dense as it gets to the terminus (likely > 1 lb/ft^3, i actually use a chunk of the dense open cel foam i commonly use for aperiodic ports)

dave

[ljfont]

DIY never ends

I just came back from CSS and heard the EL70's and FR125SReN drivers and have been very impressed by them being so even and balanced.

Would an aperiodic midTL with dual EL70's or FR125SR work?

I just bought the SDX7's today. But after hearing these CSS drivers, I'm thinking of using either of those instead of the FE167E.

I should probably ask this question elsewhere but, would enabling the FE167E drivers and adding a phase plug make it more even and balanced.

Thank you.

[planet10]

Originally Posted by ljfont

Would an aperiodic midTL with dual EL70's or FR125SR work?

I just bought the SDX7's today.

Sure... any FR will do, althou you like to squew them towards the ones that do top and mid best (usually smaller). RAW acoustics did an HT2 that was FR125 + Extremis 6.8 (then SDX7)

Make sure you do at least the minimal mods to the SDX7.

dave

[chrisb]

Originally Posted by ljfont

DIY never ends

I just came back from CSS and heard the EL70's and FR125SReN drivers and have been very impressed by them being so even and balanced.

Would an aperiodic midTL with dual EL70's or FR125SR work?

I just bought the SDX7's today. But after hearing these CSS drivers, I'm thinking of using either of those instead of the FE167E.

I should probably ask this question elsewhere but, would enabling the FE167E drivers and adding a phase plug make it more even and balanced.

Thank you.

In response to this and post in another thread, I think it's fair to say that at any "matching" level of stock or modified configuration, any Fostex and similar dimensioned Mark Audio / CSS driver will not exhibit the same degree of "balance" of tonality, dynamics or presentation (i.e. forward or relaxed). It's not necessary to choose exclusively between them - I have examples of each in my own systems, (FE127 / FE167 & EL70 - all with polka dots) and listen to both almost daily. And never underestimate the power of synergy ( i.e. to take something beyond the simple sum of the individual values).

[rx7mark]

Dave,
What line length would you recomend for the EL70 in a FAST design?

Also, have you had a chance to listen to the TRIO8 yet? Any thoughts or comparisons with the SDX7?

Mark

[planet10]

With the EL70 a lower XO would be advisable, and the lower Fs also means a longer line. I'd fold it up like the FE167 sketch above and make the box at least 10" deep (deeper (up to ~14" wouldn't hurt). Keep in mind that as we are damping things aperiodically, actual design dimensions can vary quite a bit without a whole lot of impact on performance.

Alas Trio 8 is still sitting on my bench. 10 days down with the flue has me even further behind.

We do have a full-size FonkenPrime size box prtotype for the EL70 closing in on completion (probably ahead of me finishing EL70eN (intro special still stands therefore)).

dave

dave

[rx7mark]

Hey Dave,
Thanks for the quick reply. I hope you feel better now, the flu can be tough at anytime.

I was hoping for some guidelines exactly like you mentioned. 10-14 inch depth, 10/1 area taper, folded, and aperiodically stuffed. Thanks for the guidlines. The design not being too critical is a bonus for my first effort.

I am trying to decide between the Tyson variant we are discussing with the EL70, or Alpair 7, on top and 1-2 SDX7's or Trio8's on the bottom sealed, and a Fonken type floorstander similar to your Bi-polar MiniOnken, but with 2 EL70's on top and one SDX7 or Trio8 on bottom.

Post you impressions of the big EL70 Fonken once they are done, I'de be very interested in your results.

Mark