Digitrax

Digitrax SP26158B Speaker 26.5mm x 15.5mm x 9mm 8 Ohm 0.5 watt w/ Enclosure 26.5mm x 15.5mm x 9mm  8 ohm 0.5 Watts Sound Chamber Included Fits many HO, O and G Scale installations.  Also fits in N Scale box cars...

Digitrax SP282832 Speaker 28mm Round 32 Ohm 1 watt 28mm Round 32 ohm 1-2 Watts Sound Chamber Not Included Fits many HO Scale installations.   Used on current production SFX004, SFX064D, SDH164D & SDH164K1A sound decoders...

Digitrax SP28288 Speaker 28mm Round 8 Ohm 1 watt 28mm Round 8 ohm 1-2 Watts Sound Chamber Not Included Fits many HO Scale installations.   Used on current production SFX0416 sound decoders.   The speaker is also...