The DCCS 23 mm Round Speaker with enclosure has incredibly big sound.
 
Suitable for use in: 
Any model locomotive that has provision for the installation of a 23 mm speaker
Any model locomotive that has enough space to fit this size speaker with a separate enclosure.
 
This speaker will fit inside the speaker enclosures built into the chassis of the following locomotives:
Austrains NSW 81 Class, Victorian G Class, National BL Class
Southern Rail Models NSW U-Boats
 
Only suitable for sound decoders that can handle a 4 ohm speaker.
Check your decoder specifications before purchasing this speaker.
 
DCCS - 23 mm Round Specifications:
Total Size: 25 mm round including enclosure
Total Height: 10 mm including enclosure
Impedance: 4 ohms
Max Power Rating: 1.5 Watt
Frequency Range: 400Hz~20kHz
Enclosure: Included
 
 
* This speaker is suitable for use in:
    Zimo Sound Decoders with a 4-8 ohm speaker rating.
    Models - MS440C, MS440D, MS450R, MS450P, MS581N