Hello - My first post on this site. In a previous life I designed loudspeakers and since I am now gigging, it was only a matter of time before I wanted to build a custom cab. I wanted something different so I thought about using a transmission line design. This offers a lot of advantages: 1) Nice smooth and tight deep bass 2) A flat impedance curve 3) good cone control So, I set about making one over the last few weeks in my spare time and tested it today for the first time. In this speaker there is one Eminence 3012LF in the main transmission line, which is 1.6m long, tapered and lightly stuffed where required, and also a mid and tweeter. I have been pretty compact and it has ended up similar in size to a reflex box rather than much bigger (as classic lines typically are). The bass was awesome - very well controlled, deep and powerful yet smooth and articulate. the cab has also got a small foot print and is currently 22 kgs but it cold be made less than 20 kgs by tweaking a bit. Think "Fearful" in terms of tonality and size but more and even tighter bass allowing a very flexible rig. I have setup my company Low Frequency Solutions Ltd (not yet trading) so I can use this name on the products. I will be making more, probably a 10" version right up to an 18" bone shaker. All would use neo drivers to be light weight. I would like some feedback as to what the market is like for this type of speaker - what do people actually want for a bass rig and how much would you want to pay? what finishes do people like? This speaker is very tweakable between very deep and smooth (yet tight) and huge output. Any comments and suggestions welcome. I have kept a build log and pics if anyone needs information.