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Old 1st February 2016, 08:05 PM   #1
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Default Shorty Tysen FAST Question

Wondering if making a short version of the Planet10 Tysen V2 would be a bad idea? (Sorry, my sketch is pretty rudimentary.)

Because of the odd space (I'll be putting them on a big 17" deep 'L' shaped corner cabinet), I have more depth to work with than height. In a thread Dave had mentioned a BR version in the works, but it sounds like it would be 40cm+ and I'm aiming for 30cm but 40cm deep.

I'd make them out of OSB to start, so if it is an epic fail, won't be too big of deal. I'll do an active crossover with a minidsp.

Fostex FF85wk in the top, but using winisd (though likely I'm doing it wrong) it looks like the Dayton Audio DCS165 will work best in the bottom. [Though a lot of the Peerless woofers also looked to work well in the small space and could probably fit two of the 830855 woofers push-push if I had a few more liters to work with.] The bottom would be about 7 liters tuned to 45Hz will give an F3 of about 44hz.
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Old 1st February 2016, 08:35 PM   #2
chrisb is offline chrisb  Canada
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The Tysen being an MLTL IINM, there would be a modicum of flexibility in dimensions, however any changes to the net CSA, line length, driver offset from closed end, and terminus dimensions will affect tuning and performance, in a manner likely predictable by experienced designers.

That's not to say your proposal couldn't "work" in the strictest sense, but to make an assessment of the merits of the design from which such a morph was derived would be inappropriate.

I've never worked with OSB for anything other than shipping crates, and wonder if adequate joinery could be accomplished. Even particle board might be better?
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Last edited by chrisb; 1st February 2016 at 08:39 PM.
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Old 1st February 2016, 09:15 PM   #3
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The Tysen being an MLTL IINM, there would be a modicum of flexibility in dimensions, however any changes to the net CSA, line length, driver offset from closed end, and terminus dimensions will affect tuning and performance, in a manner likely predictable by experienced designers.

That's not to say your proposal couldn't "work" in the strictest sense, but to make an assessment of the merits of the design from which such a morph was derived would be inappropriate.

I've never worked with OSB for anything other than shipping crates, and wonder if adequate joinery could be accomplished. Even particle board might be better?
I was thinking of not using the MLTL part in the bottom, just a bass reflex enclosure in bottom. I was going to try and use the top TL part, but extend the length a little which might require (allow?) a bit lower crossover to the woofer. From looking at other threads, it sounded like the TL length was based on volume and 1/4 of the lowest wavelength, but was designed somewhat ad hoc to the particular needed cabinet size. I may have stretched it way too long.

I was thinking the OSB to do a quick mockup since it might not work. But as small as the speakers are going to be MDF may be a better option from the start.
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Old 1st February 2016, 09:29 PM   #4
chrisb is offline chrisb  Canada
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I'm not so sure that much of Dave's design details could be categorized as ad hoc - you could discuss that with him via e-mail perhaps.
As with Scott L, he might have issues with judgement of the performance of an enclosure "inspired by" / "roughly based on" a design over which they may have spent much time modeling, prototyping and fine-tuning.
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Old 1st February 2016, 10:18 PM   #5
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I'm not so sure that much of Dave's design details could be categorized as ad hoc - you could discuss that with him via e-mail perhaps.
Sorry, maybe ad hoc wasn't the best wording, I just meant that he had mentioned in a few places that length wasn't super critical and was secondary to other cabinet dimensions.

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As with Scott L, he might have issues with judgement of the performance of an enclosure "inspired by" / "roughly based on" a design over which they may have spent much time modeling, prototyping and fine-tuning.
Totally didn't mean to trivialize their expertise and hard work. My bad. Mostly just looking for feedback to see if I was headed down a reasonable path for a speaker for a oddly shaped space.
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Old 1st February 2016, 11:41 PM   #6
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The original Tysen had a 7" sealed. Tysen V2 has 2 x 5 " in an ML-TL (and has yet to be built).

Think of the above as concepts. A small FR as midTweeter with woofers crossed low (~150-400Hz). The FF85 is a midTweeter we like. Woofers, woofers, seas of woofers. Pick one you like, design a box for it, then graft on either a sealed box, or a midTL for the midTweeter (our preference).

If you want to do a passive XO, you have to take relative driver sensitivity into consideration.

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Old 2nd February 2016, 12:33 AM   #7
chrisb is offline chrisb  Canada
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zach- I can see now that my own earlier posts could certainly have been read as churlish - not my intent
During the past couple of years "we" have been working on a number of FAST systems with more than a few combination and number of drivers-sometimes based as much as what we have on hand as anything else - and as Dave notes above, the Tysen, or for that matter the Alpair12PW/A7 MTMs, Facets, and others should really be considered as templates for different topologies. From a personal point of view, I tend to gravitate to aesthetics with high WAF - not necessarily a constraint for everyone.
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Old 2nd February 2016, 12:58 AM   #8
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From a personal point of view, I tend to gravitate to aesthetics with high WAF - not necessarily a constraint for everyone.
Hahaha...yep...WAF is a big driving force for me finding something squat .

The speakers you guys are making look amazing, which was the impetus to use them for inspiration. If we move or readjust the living room I may have to take the ferry trip over and pick up a flatpak for a floorstander.
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Old 2nd February 2016, 11:06 PM   #9
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I've never worked with OSB for anything other than shipping crates, and wonder if adequate joinery could be accomplished. Even particle board might be better?
OSB can be used! I built the prototype for my Pappa's TL using OSB. Nasty, UGLY stuff, but you can make nice tight joints. It was very nice acoustically, however...

For those who might be tempted by the dark (cheap) side: I suppose it might be possible to coat it w/ Bondo & make it something like presentable, but the cost in time & materials to 'fix' the mess far out weigh other options. The wretched thing shot splinters at me every time I touched it.

Cheers, Jim
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Old 6th February 2016, 04:20 AM   #10
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I'm a little embarrassed to admit I kinda like the look of OSB. Edges look like trash, but the finished side has a nice industrial look to it.

But turns out I found some knock down boxes that will be nearly the size I was planning, just a bit wider that planned on once I turn them on their sides.
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