Anyone built anything like PMCs trans. line monitors?

[imperfectcircle]

I recently heard a pair of PMC TB2+ monitors and was quite impressed at the big sound from these small bookshelf speakers. Has anyone done a similar transmission line bookshelf speaker?? I believe PMC uses Vifa drivers.

PMC transmission line monitors

 

[leadbelly]

Looks kinda fishy to me, at first look I would think it is a highly compromised TL, hardly a true TL at all in fact.

 

[seanzozo]

Looks like a 56" TL with a very small cross section. I listened to a pair of those years ago, I recall them being not bad.

Sean

 

[Tenson]

PMC use their 'advanced transmission line' technology. So no, they are not the same as you would get from Martin's MathCAD sheets for example. Compromised? Actually, I don't think so, they seem to work VERY well!

I would suggest they might be modelling them as a small enclosure with a very long and wide port. Might be worth an experiment to see how such a speaker turns out.

 

[seanzozo]

Martin's worksheets should model this TL fairly easily. Its a constant CSA line with the driver offset slightly.

Sean