Brett Wing
Civil / Structural Engineer with an interest in making the masses of information collected over the years more accessible
Home Page hifiloudspeakers.info. Acoustic transmission line. The comparison between an acoustic duct and an electrical transmission line is useful in "lumped-element" modeling of acoustical systems, in which acoustic elements like volumes, tubes, pistons, and screens can be modeled as single elements in a circuit.
With the substitution of pressure for voltage, and volume particle velocity for current, the equations are essentially the same.[1] Electrical transmission lines can be used to describe acoustic tubes and ducts, provided the frequency of the waves in the tube is below the critical frequency, such that they are purely planar. Box Library. Box Library / CSS. Transmission Line Speakers Read Me. Me & my site The T-Line Speakers site is my hobby site.
It started out as a question to the basslist with a single page and has grown beyond my wildest dreams. It sort of marks my return to serious interest in HiFi after a 15 year absence (i spent 9 years in the hifi business in the 70s & 80s). It's prime theme is T-Lines but i'll put up anything (hifi related) that i am interested in. I am always way behind getting stuff up on this site, because i just don't have the time i'd like to devote to it... there are many projects and articles sitting in my queue -- enuff to at least double the size of this site.
Exoliner QuarterWave Line Design. Rick published a design in Speaker Builder 5/1999 that he called "Rhinos".
It is adapted here for the web. These use a quarter wave line and high Q drivers. Using the simulation model software developed by George L Augspurger, which will model a TL with a reduced terminus, Rick extended his work with the Rhinos and came up with a cookbook design for a class of QuarterWave speakers -- he calls it Exolinear Design. Note: Exolinear Design is undergoing revision and the old pages have been removed to avoid confusion. Brines Acoustics. Classic TL Design. The classic transmission line bass enclosure has never been completely and successfully modeled such that it can be built from a pat set of equations.
Some claim to have done this, but it doesn't seem to allow a first time build without adjustments, so the models have enough wrong to require a fudge factor at least. I can give you the basics, and explain the first principles, and this might allow you to forge ahead on your own. My data is taken from Bailey, and years of experience of my own, culminating in several pairs of successfull T-lines, one of which I use to this day.
The line area should equal or exceed slighty the cone area of the driver used. Transmission Line Speakers. Quarter Wavelength Loudspeaker Design. OB Theory. MathCad Computer Models : Upgraded Versions. Last Revised 1/22/13 The MathCad worksheets, that have been available for the past few years, have now been upgraded once again to include several new features aimed at providing a better estimate of a speaker system's in-room performance.
A few small changes have been made in the first section of the worksheets to improve the fiber damping correlation, allow the user to defined input power level, and automatically adjust the Thiele/Small parameters to account for the effects of additional series resistance. IMF electronics. Transmission Line Theory. Horn Theory. The following article derives the method that I am now using to model the acoustic response of front and back loaded horn loudspeaker systems.
The article contains ten sections, saved in "pdf" format, for ease of reading and downloading. Additional articles on Horn theory and design. Transmission Line and Back Loaded Horn Physics (added 03/29/13) A Method for Designing a Compact Back Loaded Horn Loudspeaker System (added 06/21/12) At this time new MathCad worksheets for designing front and back loaded horns are being developed.
The new back loaded horn worksheets, in the MathCad Computer Models section of this website, are all that is currently available. If you have any questions or suggestions about the documentation, I would be interested in hearing your comments. -Home Page- Classic TL Design. Transmission Line Speakers. Quarter Wavelength Loudspeaker Projects. General Speaker Related Articles. OB Theory. Horn Theory. Transmission Line Theory. Quarter Wavelength Loudspeaker Design.
Quarter Wavelength Loudspeaker Design. High Performance, Low Cost DIY Horn Designs. Frugal-phile DIY Audio Community Site. Transmission Line Speakers. Home Page hifiloudspeakers.info. LS3/5A Support. LS3/5A Support & Repairs There are many legacy LS3/5As up to 35 years old that still work very well.
This is the page to try to help fix those that don't. There are only 4 major components to the speaker, the cabinet, the B110 bass/mid driver, the T27 tweeter and the crossover. The LS3/5A was manufactured by several licensees during its lifetime including Rogers, Spendor, KEF, RAM, Chartwell, Goodmans and Harbeth.
By 1987 too many B110 SP1003 drive units were falling outside specification and so KEF redesigned the speaker using the B110 SP1228 drive unit. If you are unfamiliar with the inside of the LS3/5A then following links are a good starting point to familiarise you with what to expect when you open one up. XLR connector The BBC used XLR connectors as a standard on their loudspeakers and so you may come across some pairs with a chassis mounted 3-pin male XLR connector fitted. LS3/5A Support. LS3/5A Support. LS3/5A Support.
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