Just a testimonial for those thinking about doing the same. I decided to replace the speaker in my late 70's Kustom 1x15 cab with a 3015lf kappalite. I'm going to refurbish the cab including baffel soon. Just couldn't wait to hook this joker up! The cab is a really simple design. I think I may try to make another one it sounds so good!!! The cab already sounded good. I like it better than my Traveler 15, as it is punchier with better mids and highs, with no tweeter. Also, it matches my VB2 width wise. The interior dimensions (roughly) are 22 X 22 x 12. While the 10 year old, re-coned eminence I had in it sounded good, it was could definitely fart when pushed. The 3015 is tighter, handles low eq much better, and is waaaaaay faster response wise. I had the VB2 gain on 6 and master @ 7 and I didn't need or want to turn it up any louder. I'm a fender, flats, & classic tone guy. The only thing I'm wondering about is if it's better to front mount the speaker. I had to rear mount it due to the existing baffel hole not being big enough.