Hmm, now even I'm confused
Probably time to clarify......
Richard is correct (as always!) size has nothing to do with impedance. All our speakers are [as of Warley] available in Loksound compatible (100 ohm) or in 8 ohm for other decoders. All are manufactured to our specifications by a specialist speaker company. and built from the ground up, (with frame, diaphragm, voice coil and enclosure all being 'tweaked' for bass) there is no connection with ESU/Loksound
Due to the expanding range, we're in the process of changing some part numbers the XXX part is the speaker impedance, and the labels are also colour coded, Red for 8 ohm, and green for 100 ohm - very important these don't get connected to the wrong decoder!:
We have 3 types of Bass speaker, these are 'all in one' speakers which include an engineered, airtight enclosure and attached wires
1) Bass reflex (DCC01-XXX) This is 22mm wide by 58mm long and 9.3mm thick. Though they are 18mm longer than Loksound enclosures, they are half the height, which makes a huge difference in the ease of fitting, and will 'drop-in' to larger locos, smaller locos may need some modifications.
2) Bass reflex (DCC03-xxx) This is the new 'American' style, 18mm wide x 53mm long x 15mm high. Made for the narrow US style locos, but also great for steam locos.
3) Bass enhanced (DCC02-xxx) This is 20mm wide x 40mm long x 8mm thick. Not a 'reflex' design, but using top quality components we've managed to produce a ready to run speaker, that sounds better than anything else (other than our reflexes of course!) Due to the slim design, these will fit practically anywhere.
We have also made the 'bare' speakers available, as the rubberised cloth diaphragm, frame and voice coil we use will significantly improve over 'traditional' mylar speakers. These units must be built into an airtight chamber for best results (as with any speaker) and are available in 8 and 100 ohm types in 20mm x 40mm and 16mm x 35mm sizes.
I hope this helps clear the fog a little. Full information can be found on our website here:
http://tinyurl.com/2or29d (Link via Tiny URL)
Best regards
Andy