This is possibly the coolest music video ever made!
The outgoing Commander of the ISS singing "Space Oddity". In space.
(to price list)
The PRO 012 woofer is used in the model QT-1+ and QT-2+. Some of the earliest ones I built used other woofers, but this is the replacement you want for them, also.
It is not necessary to return the old part when replacing this part.