|
Speaker Asylum General speaker questions for audio and home theater. |
|
|
|
Speaker Asylum General speaker questions for audio and home theater. |
|
In Reply to: Re: Please explain: Transmission line bass loading. posted by Clayton Oxendine on March 30, 1999 at 19:59:39:
Transmission lines (T/L) and Labyrinths are more common in British speaker designs than anywhere else.The "transmission line" uses a woofer that radiates out of the front like a conventional speaker design, but also radiates the sound produced from the back of the woofer into a box that is actually a tuned tunnel. In order to conserve space in many designs, the tunnel is folded inside the box like a small maze. The maze feeds a large opening, much larger than a port typically. The hole should just about equal the cone area of the woofer being used. Internal dimensions are VERY critical to tuning. This makes it hard to mass produce.
The impedance peak is very small and well damped, letting the amp control the woofer much better than in most ported or passive radiator designs. Even though it does use the back wave of the woofer like ports and passives do, T/L's typically don't suffer from the the same side effects such as ringing and "slow" or "sloppy" bass. Port noise is also minimized due to the use of such a large vent hole.
Bass response is typically VERY smooth and extended with excellent control IF properly designed. T/L's typically suffer from lower efficiency though and do take more power to play loud. They are an "easy" load to drive though, as their impedance stays pretty consistent throughout the drivers range.
As Clayton stated, it is very difficult to build a good T/L design, let alone mass produce it. That is the main reason that they aren't that common. If properly done, transmission lines are about the only design that can rival the "tightness" of a properly designed sealed box. If you've got enough amp and the manufacturer has done their homework with good quality control, they can work excellently. Sean
>
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Re: Please explain: Transmission line bass loading. - Sean 00:04:43 03/31/99 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2024, Audio Asylum, all rights reserved ]
