This has some rust on back but working. I have 2 of these in similar condition. Both sound good. This Sansui W-155 woofer is a great addition to your SP-2500X speakers. Made in Japan, it has been tested and is in good working condition. The brand is known for their quality vintage audio equipment so you can expect a great sound from this woofer. The model number is SP-2500X, so make sure it is compatible with your existing speakers. This is a great opportunity to upgrade your vintage audio setup. G