SoundTraxx 28mm Square Mega Bass Speaker
 
This is our largest Megabass speaker which provides the best low frequency bass sounds for your steam, diesel, and electric models.
 
Dimensions: 28 x 28 x 11.2mm(D)
Frequency Response: 310Hz - 20kHz
Peak Power: 2 Watts (Nominal) 4 Watts (Peak)
Impedance: 8 Ohms 
 
MSRP; $12.95