Old VW Beetles are cool vehicles but they weren't designed for great sound. It's particularly hard to find a good spot for aftermarket speakers, but now RetroSound offers a neat solution install their VWKPB enclosures in your Beetle's kick panels and start rocking out.
Compact, paintable enclosures
The R652N speakers have a mounting depth of less than 1-3/4", so these enclosures don't take up a lot of space. You can paint the enclosures to match your VW's interior, and each enclosure already has a cutout for the RetroSound speaker, so they'll just pop right in. These enclosures fit in 1949-71 standard Beetles; they will not work in Beetles equipped with a bamboo tray, Beetle convertibles, or Super Beetles.