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-   -   Best TL Sub Design You Have Seen? (http://www.diyaudio.com/forums/subwoofers/93805-best-tl-sub-design-you-have-seen.html)

Dominick22 9th January 2007 02:09 PM

Best TL Sub Design You Have Seen?
 
I have everything ready to build my first TL Sub, but I am just looking to copy someone elses box design for the most part.

What do you guys think would make for a great cabinet? Size does not matter! Literally!

Pics/links would be appreciated,

Thanks,
Dominick

DorinD 9th January 2007 03:22 PM

See that:

http://www.speaker-online.de/bauen/tlsub.htm

or mine's :cool:

http://www.hi-fi.ro/fhifi/viewtopic....=asc&start=120

freddi 9th January 2007 03:39 PM

Hi DorinD - might you give details on that beautiful midbass horn?

Freddy

DorinD 10th January 2007 09:48 AM

Hi Freddi,
Look at this subject:

http://www.diyaudio.com/forums/showt...66#post1056466

Ang 13th January 2007 07:17 AM

DorinD - what sensitivty are you getting out of that? Thanks.

Geoff H 13th January 2007 07:26 AM

http://www.audioheritage.org/vbullet...ad.php?t=12126

Scroll down just past halfway. That is a sub.

Geoff.

eTapio 14th January 2007 07:49 AM

Hi,

you should give a Zyklop-TL a try, with an Eminence Lab 12 driver. This one rocks!

http://www.lautsprechershop.de/hifi/zyklop_tl_en.htm


Regards
Tapio

DorinD 14th January 2007 08:43 PM

@Anq
In the first version of my TL sub (passive crossed to mains) I go with the line completely unstuffed and sensitivity was pretty good, a little more than 90dB@100Hz and just a little less (3-6dB) than of the bass-horns at the same frequence (there is an other trick here because TL has 2 drivers of 4ohm each configured isobaric but the mains have 8 ohm nominal).

But after I stuffed the line to increase the control of it (unstuffed was too boomy on the room's resonances) the sensitivity gone down by another 6dB but not a problem for an active system now.

All these figures are very, very aproximative because were determined by simulation and comparisons to horns in an untreated room.

Xmax BR 15th January 2007 11:40 PM

Dear,

See:


http://www.htguide.com/forum/showthr...light=finished

or

http://www.diyaudio.com/forums/showt...65#post1076465



http://www2.mrweb.com.br/fvm/dsk/send/var.jpg


Tks,

Renato

bjorno 20th January 2007 07:45 PM

2 Attachment(s)
Geoff H:

Quote:

Scroll down just past halfway. That is a sub.
Hi,

FYI:
I’ve spent some time looking for suitable drivers that really reach the infra region without the need of active compensation by modelling sub enclosures with MJK: s eminent software’s.

Maybe the right way is to use drivers that are suitable for IB/OB like the Altec 3182 or similar if very low extension is the primary goal.

I was surprised of what could be achieved with J.Bouska’s folded transmission line loudspeaker and decided to compare with a driver in an enclosure I know is powerful, a DBR with AURA NS18-992-4A:

After reading at: http://www.audioheritage.org/vbulle...ead.php?t=12126 and looking at the result of my simulations I don’t agree with the conclusions made and that can be read from post #7 and so on. See my plots.

Nevertheless, it looks indeed promising to build the tall cylindrical speaker that measures dia. about 20” or 50 cm by 88.5” or 225 cm and use only one that could be placed at a position where the lowest room modal frequencies are invoked, in the front or at the rear of room.

All other subs, two or more could then be of more modest sizes and have cut-off within the modal range of the room placed preferably at a listening angle of more than 45 (to 90) degrees, e.g. rather laterally placed in the cone of confusion to ensure good audibility in order to externalise low frequencies at the sub and infra regions that follows from the possible exited pressure gradients. See:

http://www.world.std.com/~griesngr/asa05.pdf

See the simulations of the J.Bouska’s Altec sub that follows:

b

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