1960 altec 16 inch woofer, goes down to 35 Hz. I have TWO of these in car, along with the Altec 12.1's, which are crossed over @ 55 Hz, at which time these take over the bass duties. Remember, this system is as vintage as possible; I'm building the car as if I'd have started building it in 1978. At that time, Altec and JBL were THE KINGS of audio, and their speakers were BADD AZZ, so I knew I wanted my most perfect car that I've built (I've had 19 hotrods/musclecars over the years) to be my very best effort, and have features NO ONE else have, which, so far, I've achieved. Oh, btw, I have ALL the toys listed here, in pix or written word, but 1 thing I've forgotten to mention is that even with ALL these toys, I STILL have about 90% of the original trunk space left! It all comes down to LOTS of planning, measuring, figuring air volume, etc. It CAN be done!