New sub design? Constricted Transflex, simple build (series tuned 6th order) - Page 12 - diyAudio
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Old 17th August 2014, 10:01 PM   #111
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by sabaspeed521 View Post
Power test is in but I haven't run measurements because don't have a huge backyard, will be going to a friends to test the sensitivity and what response outdoors.

In a word, beautiful - sub audible distortion playing music even close to max. Not going to do a 35 Hz sine wave test because my house rattles a ton even with music going.

Sound quality is comparable to the T60 even up to max volume (preliminary testing). Will be building more of this design, it trumps my MFW 15 in output and sounds a lot better. To think I only spent 100 bucks to build it (including 40 bucks in parking at meters/tickets), It blows my mind. I dare someone to build something with more SPL to 35 Hz in a <4 cu.ft. box in 5 days that sounds just as good as this thing.

1 word, awesome.
Congrats!!!


What driver are you using - I missed it somehow, because the LAB was more than $100.
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Old 17th August 2014, 10:52 PM   #112
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MAGNIFICENT!!
I am now exceedingly happy !
I commend Saba for his bravery, not everyone is willing to take the risk to build something unorthodox ... You make a fine Guinea Pig Mr Saba !

Thank you for giving this design a chance,

Truly
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Old 17th August 2014, 11:52 PM   #113
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Originally Posted by Capt Grogg View Post
how does this special lab 15 sim bottom exit and enclosed side?
Captain! The "end-firing" version sims close enough to the same, and should work just as well, FB might shift down slightly , and you would probably want to use an access panel with that arrangement ..

Last edited by Matthew Morgan J; 18th August 2014 at 12:07 AM.
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Old 18th August 2014, 12:03 AM   #114
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Quote:
Originally Posted by xrk971 View Post

What driver are you using - I missed it somehow, because the LAB was more than $100.
XRK,
The Alpine SWE-10S4 driver is what he used in that small box, (correct me if i am wrong Saba) , i know he was considering some of the SWS 10s as well .... The cab is a slightly scaled up version based on a 50 liter (net) cab ...

The special edition Eminence Lab 15 works in a 135 liter version of that same design ...
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Old 18th August 2014, 12:47 AM   #115
tb46 is offline tb46  United States
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Hi Sabaspeed521,

Post #110: "...I dare someone to build something with more SPL to 35 Hz in a <4 cu.ft. box in 5 days that sounds just as good as this thing."

Sadly, time has not been my friend lately, so I cannot take you up on your challange ( :-) ). You might take a look at a MLTL as proposed numerous times by bjorno, it seems to suit this driver, and comes in @ a Vnet=90.6 L v. the ML-TP's Vnet=135.676 L.

The MLTL will accept a little higher input power before reaching Xmax, and may have the edge when it comes to group delay.

Maybe you can knock out one of these too, and let us know how they compare. :-)

Thanks for sharing your experience, and letting us know that the ML-TL is a success.

Regards,
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Old 18th August 2014, 03:26 AM   #116
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I primarily chose the ML-TP because the design is easy to build, not that I'm opposed to difficult builds and honestly I also chose it because it had IMO a more complete drawing for me to go off of (novice CAD user here). I'll look into the MLTL designs some day (after the MLTP Lab 15).

Yes matthew is correct the first two subwoofers use the SWE 10s4 because I got them for 50 bucks shipped and they fit the needs of my original customer.

Corner loaded output is absolutely awesome for it's size, and it doesn't "sound like a small driver" whatever that means (I've never been convinced that 18's are better than 10's or 12's I just know that I can tune a bunch of 10's and 12's in small boxes that will sound just as good to my ear for cheaper ).
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Old 18th August 2014, 09:13 AM   #117
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Quote:
Originally Posted by xrk971 View Post
Have you thought about doubling it into a push pull design to reduce 2nd harmonic distortion and double SPL? You can just make it twice as wide and put drivers side by side in PP with one flipped in. Or, put them side by side with drivers having separate chambers on back and common chamber in middle with a cutout facing front plane of drawing as exit port.
XRK,
This design could certainly be adapted to PP with two drivers... Keep the same path length, double the internal airspace and scale up the constriction's "area"

Last edited by Matthew Morgan J; 18th August 2014 at 09:17 AM.
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Old 18th August 2014, 10:59 AM   #118
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Exclamation NEW VERSION OF THE ML-TRANSFLEX 10S4 BOX !

Here is the fully updated 40hz ML-TRANSFLEX version 2 for the Alpine SWE-10S4.


  • I moved the constriction up the path some, and i extended the total path as well by a small amount.
  • Added a few more inches of height. Shaved off a little depth. The added internal airspace amounts to 4 more liters in this version, but a flatter response with a little more output are gained from these changes so it is a worthwhile compromise in my opinion.
  • Better damping (less "saddle" and also less peak at FB. These improvements often associated with reduced group delay means a more natural sounding roll-off on the bottom end).
  • There is more detail in the sketches now and the proportions are more accurate.
  • Simplified Hornresponse inputs by removing an unnecessary segment.


Enough "splitting hairs" for now ... I think i am satisfied for the moment with this Box's level of fine tuning ..
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Old 18th August 2014, 10:56 PM   #119
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Quote:
Originally Posted by Matthew Morgan J View Post
XRK,
This design could certainly be adapted to PP with two drivers... Keep the same path length, double the internal airspace and scale up the constriction's "area"
I'm seriously considering putting two subs side by side to accomplish this with drivers opposite mounting. One day I'll have a reason to. Thing is the distortion is so low to begin with it may not be worth it unless in a large room where you're driving max power at low frequencies really loudly (which would require ~4 subs imo).

Also, ran some frequency response measurements and here is the "tamed" frequency response of "just ML-TP" and ML-TP + T60 where the T60 is LP at 32 Hz keeping it's standard HP of 25 to blend in with the TP. It'll make more sense looking at the picture .

I didn't boost the low end at all and in fact my room required a 10 dB cut at 43 Hz (room resonance). Ignore the crazy dip at 90 that's also room as verified by my running a sweep with my T60 running full bandwidth (which has a naturally rising response) and it showed the same massive dive so clearly it's a room issue.
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Old 18th August 2014, 10:57 PM   #120
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Note the above graph is corner loaded and the spl wasn't calibrated because I can't find my darn spl meter but the microphone is calibrated with a factory provided file.
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