Just buy new speakers. You're going to need a sub with higher frequencies than normal plus an overly complicated amp which isn't likely to be small.
@aggi started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Just buy new speakers. You're going to need a sub with higher frequencies than normal plus an overly complicated amp which isn't likely to be small.