Archimago's Musings: MEASUREMENTS: Melody Onix SP3 Mk. II (~2006) Class AB Tube Integrated Amplifier. (And it isn't "diminishing returns" on sound quality, often there are simply "no returns".)
Infinity Kappa 463XF 4" x 6" (104mm x 157mm) Two-Way Car Speaker - Pair : Amazon.ca: Electronics