It is always fascinating to hear the sound of a transmission-line of which the bass can play without an inhibitory air cushion down to its intrinsic resonance. Sadly the case can not be build small because the line length required. With the case that was build for this instructions we have put the necessary folding has been made to the side, so that the TL still looks slender. As construction material we used furniture construction boards which spared us of many of the usual steps on the surface.
We had the hardware store cut two of the construction boards to a length of 89.2cm. Additionaly we got a couple of 16mm MDF boards. That was all we needed.
The suitable distance between the corner of the board and the side are kept with one spare board and at the top with two spare boards.
After gluing the bottom board it is obvious that one board is a little longer than the front.
At the top we still kept the aiding boards. Two additional ones with a width of 7.6cm will keep the first inner board where it should be.
The chamber for the full-range driver is build. Lid and base get the right distance with the help of two additional boards of 15.2 cm height. Like all speakers in this magazine we used fugue glue to glue the boards. It is very frugal, so more than half of the tube is left after building this speaker.
The second inner board and the second side have been glued on. On a side note: It will make the further progress easier if one drills a hole for the cables into the base board of the chamber for the full-range driver. Instead of having to do that later.
All edges get some glue and the rear board is put into place. To make sure it stays in place some additional boards are used and removed before the glue cured too much to remove them without problems. A side note for all the sceptics out there: The glue will bond with the wood underneath the plastic veneer. Test have shown that force applied onto the adhering will break off quite some of the wood beneath too.
As we already learnd when we were building the FirstTime1 it is thought of as more beautiful when the insulating material and the holes can not be seen. In order to do so, we can take the very same method of creating a cover that we used with the FirstTime1. the only thing we need to change are the dimensions of the frame and the tissue.
As usual some things only come to mind until after the work is actually done. We did not think of coloring the MDF during the construction to fit the color of the cunstruction boards. If you read these lines before you start with your project, we hope, that you will keep this in mind.