Have just replaced the audio speakers on our 460. The large newer Hunters (410-460)have quality JVC AM/FM/CD Stereo receivers and separate JVC high power amplifiers. However, the Seaworthy speakers are very inexpensive and can't handle much power. I just replaced the SeaWorthy speakers in the main cabin with 6.5" Polk Audio at $120/pair (Circuit City). They fit in the existing cut outs. Infinities and other brands would also fit. I replaces the exterior 4" Seaworthy Speakers with identical size Poly-Planars available from BoatUS at $50/pair. The difference is tremendous, especially in the cockpit. Met a new 450 owner who did even a more fancy upgrade who modified the exterior plastic housing that house the small exterior speakers and installed 6" speakers that sounded terrific.