albumdanax.blogg.se - 2 inch speaker enclosure design

#2 inch speaker enclosure design driver#

Pretend you are trying to smoothly direct a flow of liquid, make the fold or bend as smooth as you can.

If the line is folded, place reflector plates in the corners.

My last enclosure used 3/4 ultra high density particle board laminated with 1/2 inch birch plywood. Fortunately, the relatively small cross-sectional area, and traditional T-line construction techniques make this possible to achieve. Think in terms of making the walls TWICE as solid as a conventional enclosure, or better.

The walls of the line MUST be extremely rigid in order for the T-line to function as intended.

The effective slope of the roll off will be close to 6 dB/octave, and the low bass will not fall off a cliff like a classic vented box does. In most rooms, the bass lift due to walls and floor reinforcement will have the system near flat at this point, depending on the actual frequency.

If the line stuffing and the tuning and the sizing and the spacing have all been done correctly, the T-line will be down approximately 6 dB at the tuning frequency in an anechoic envirionment.

My T-Line has a 40 Hz tuning, and what with room gain and all, it is -3 dB down at 20 hz. I wouldn't recommend trying to get super low, as the T-line will have a very shallow roll-off at the line tuning, and useful bass response will extend for an octave to an octave and a half below this point.

#2 inch speaker enclosure design driver#

Contrary to popular belief, almost any driver can be used in a T-line, however, the driver resonant frequency IN THE APPARENT VOLUME OF THE T-LINE should be as low as you want the bass to extend, so if the driver in the apparent box volume of the T-Line has a resonant frequency of 60 Hz, and you wanted to get down to 40 Hz or 30 Hz, obviously, this one wouldn't be what you want.I placed a little extra right behind the driver, and then made the rest of the line uniform. Some argue that the density should be greater just behind the driver, and gradually taper off, while others argue that it should be uniform through out the line. Acoustastuff and long hair wool are the prefered materials (the new Miraflex by Owens-Corning may be OK), these both have convoluted surfaces along the length of the fibers, which aid in the function of the material. Fiberglass or polyfill can be used, but these are not the best. The material chosen affects both the apparent speed of sound in the line AND the apparent increase in box volume. The line should be stuffed with an average of about 0.5 lbs to 0.7 lbs of acoustical stuffing material per cubic foot of line volume.This is the hard part, as the line stuffing affects both the total apparent line length AND the total apparent box volume simultaneously. The line length should be 1/4 wavelength tuned to the resonant frequency of the chosen speaker IN THE BOX VOLUME CREATED BY THE TOTAL T-LINE CROSS SECTIONAL AREA TIMES LENGTH, and as if the box were a closed box.

This means a very tight sizing for the woofer mount and the begining of the line. The area can be gradually tapered down to the actual area to save space, but it can remain the same as when it started, as long as it is not more than than about 20-25% more area.

Normally, it is difficult to make the line area exactly equal to the cone area, as the frame and mounting immediately force an area larger than the cone area. The line area should equal or exceed slighty the cone area of the driver used.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. I can give you the basics, and explain the first principles, and this might allow you to forge ahead on your own. 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. 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. Editor's Note: This methodolgy is obselete and here for historical purposes.