This Acoustic Amp Is a Portable Performer! Whether you're looking for a portable amp to boost your acoustic for a live show or a great mini PA you can use for practice, you're going to love this little amplifier. The 60-watt Fishman Loudbox Mini weighs less than 20 lbs., yet it can fill a small venue with enough sound to stand on its own. As they do with all of their gear, Fishman built the Loudbox Mini to bring out the most natural sound from your instrument. It features practical functions including chorus and reverb effects, feedback suppression, and simple-to- use EQ dials.