Bailey/Radford

1960s - one of the first speakers utilising the classic transmission line principle



Cambridge Audio R50

1970s - again, one of the first and a very well known design still available second hand today.



IMF

1970-1980s - possibly one of the most well known makes, a high end speaker, highly sought after, reknowned for excellent imaging and depth of bass (some designs response quoted to 18Hz) Well known for being the size of a fridge. Hard to get hold of and still fetches a decent price.



TDL Studio

1970-1980s - slightly more domesticated than the IMF (a bit smaller), although part of the same company. Not to be mixed up with the later RTL products (a bass reflex design) or the Studio 10, which is not a TDL design, just a speaker made by the company who bought the TDL name. The original Studio range is again well sought after and reasonably hard to find, possibly because owners simply don't want to part with them.



B&W DM2

1974 - B&Ws forage into a transmission line design. A very nice sounding speaker, still quite big but a lot smaller than the IMF designs and can also be picked up quite cheap.



Bose

1985 till now - Anything that Bose labels as a Waveguide is based on TL principals. A driver firing down a tuned line. An effective way of getting good bass response out of small drivers, resulting in reasonably small cabinets and a rich, room filling sound.



PMC

1990s till now - High end studio monitoring company utilising TLs throughout their range which has also branched out into the domestic market with a large range of stylish designs.



IPL

1990s till now - high quality, well reknowned and respected kit based TL speakers for those of you who'd rather build your own and learn a bit about TLs along the way.



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