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Transmission line enclosure for DD 6,5" test and results


Haakon

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Just thought I'd share this little project I'm running at the moment. 

A few years back I made a very basic T-line enclosure from a small Focal 5" woofer I had laying around. I used to have four of them in a sealed box, but I popped one, and sold two. So I had one left. Much to my surprise the single woofer in a T-line outperformed all of the four I had earlier, both in depth, loudness and impact. Sounded really nice too! But a single 5" is still a single 5"...

Move on a few years, I thought I'd experiment a bit more but with a more capable driver, yet smaller than just about anyone is using. I bought a new DD 506 (redline) woofer, and relying on the supplied parameters; i made a tapered T-line box for it, using this very simple calculator found here: http://www.mh-audio.nl/tml.asp

You just input the SD and FS on the driver, and the height of the box, and it does the rest. Very basic, but useful as a starting point. I built the quarterwave one (classic tuning). 

Internals of enclosure, 22mm MDF:

post-38574-0-35722000-1518973376.thumb.jpg.eca730426b2de115377cab19b414cdae.jpg

 

The subwoofer driver:

post-38574-0-12885900-1518973408.thumb.jpg.07aba8686f41ff94114b996eb63feb82.jpg

Box in car:

post-38574-0-69713800-1518973425.thumb.jpg.99a73c1788d5474232ff5a05535a384e.jpg

This was done just a day after I built it, so possibly more to come later on. Not a burp either, just playing some random music with added bass. I think this was a Pink Floyd song with a pretty strong 44hz bass note added :D

post-38574-0-67936000-1518973441.thumb.png.7d9423cd484cb4087ef63ac3392e82d6.png

I do have lots of power on tap, way more than the woofer can handle mechanically in this box (can get it to bottom out pretty easily), running a Helix SPXL1000 at 2ohms (about 1200w rms)

But very impressed with this little woofer in this box ?

 

Thanks for looking! 

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That’s a great little sub and impressive numbers for one 6.5.

2022 Ford Maverick on 22’s                                                                                                                                          Skar SK1500.1 on 4 Skar VD-8’s                                                                                                                       Mids Sundown Super tweeters, Skar TX 6.5 components on Skar SKM400.4                                                 LC2 for audio control  , XS Power D680 XS Series Extra Battery 

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  • 11 months later...

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