Posted on Wednesday, November 04, 2009 - 15:03 GMTMe and my buddy researched t-line box builds after we went to a local car audio shop and had the owner explain tried to explain them to us. It is actually considered a quarter wavelength box and the port is roughly 7 feet long. The port area had to equal the cone surface We put a power acoustik mofo in the tline box and it was louder than 3 mofo's in a ported box 7 cubes tuned to 34 hertz. I know we need better equipment, but hey we're poor kids lol.

Its 3/4 mdf, 45'd all the corners in the port. Posted on Sunday, November 08, 2009 - 21:11 GMTWould anyone mind helping me figure out proper port area+ length for my IDMAX.

I think it could be amazing in a t-line. If you wanna be really nice a drawing would be sweet. Cone area of the IDMAX is 545cm^2 which i think is about 84.48in^2 That seems like a pretty large port to me. Is that right? If I'm doing it correctly I would need like 15Hx5.6W and say I wanted to tune to 34hz like you did I would need 8.25 ft of port depth? As far as the corners of the port, Do I need to take into account putting in 45degree angles and make the port longer?

Anyone have more info on building T-lines? Posted on Saturday, November 14, 2009 - 17:58 GMTIDK if your wrong in your design but I have found this diagram and it is different from your design. } This is a tappered version for lower fresquency subs but it is still the same concept.

Ahh, the good old quarter wave ground plane! This calculator can be used to design a Quarter Wave Ground Plane antenna, with radials. The radiating element is a quarter wave (λ/4) and the radials are 12% longer. This calculator can be used to design a Quarter Wave Ground Plane antenna. For designing a 1/4 Wave Flared Vent T-Line/Horn/Bass Reflex Enclosure. 21): If one cannot afford the space for a full-wave antenna, the next best thing is to.

An well your design seems like the placement of your sub will reflect the sound wave back to the speaker. Is there anyone with more knowledge of this box design. That link you have all the pictures are corrupt so that is no help. I'm am trying to desgin one of these boxes. Posted on Wednesday, November 18, 2009 - 06:50 GMTIsobaric is so u can 1/2 the vas! Allows u to put say a 15' speaker in a box 1/2 the size.

But- its less efficient. Just allows u to use a larger speaker in a smaller box. BUT- then ur throwing away money on the 2nd driver- cuz the cone area isnt utilized? SO why not just spend ur money on the proper drivers for the size of box u can build for the space u want to use up? If u go ported say, then each time u Double the cone area, u gain 3 db (unless each speaker receives the same power )ie: 2x 10's, then 4x 10's, then 8x 10's then 16x 10's.

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THE more drivers and cone area- the MORE output given the same power. IF u dump 3000 watts to an 8' sub- it can only mover so far and only move so much air. Better to go MORE cone squares.

A transmission line loudspeaker is a loudspeaker () that uses an within the cabinet, compared to the simpler enclosures used by sealed (closed) or designs. Instead of reverberating in a fairly simple enclosure, sound from the back of the is directed into a long (generally folded) damped pathway within the speaker enclosure, which allows far greater control and use of speaker energy, and the resulting sound. Inside a transmission line (TL) loudspeaker, is a (usually folded) pathway into which the sound is directed.

The pathway is often covered with varying types and depths of absorbent material, and it may vary in size or taper, and may be open or closed at its far end. Used correctly, such a design ensures that undesired resonances and energies, which would otherwise cause undesirable auditory effects, are instead selectively absorbed or reduced (') due to the effects of the duct, or alternatively only emerge from the open end with the sound radiated from the front of the driver, enhancing the output level ('sensitivity') at low frequencies. The transmission line acts as an, and the padding both reduces reflection and resonance, and also slows the speed of sound within the cabinet to allow for better tuning. Transmission line loudspeakers designs are more complex to implement, making mass production difficult, but their advantages have led to acclaim for a number of manufacturers such as,, and the like. As a rule, transmission line speakers tend to have exceptionally high fidelity low frequency response far below that of a typical speaker or, reaching into the range (British company TDL's studio monitor range from the 1990s quoted their frequency responses as starting from as low as 17 Hz depending upon model with a sensitivity of 87 dB for 1 W @ 1 metre), without the need for a separate enclosure or driver. Acoustically, TL speakers roll off more slowly (less steeply) at low frequencies, and they are thought to provide better driver control than standard reflex cabinet designs, are less sensitive to positioning, and tend to create a very spacious. Modern TL speakers were described in a 2000 review as 'match[ing] reflex cabinet designs in every respect, but with an extra octave of bass, lower LF distortion and a frequency balance which is more independent of listening level'.