The SA-36A Pro has theTDA7492PE as its main chip. It uses TDK inductors and AV / PILKOR polyester film capacitors for output filtering. The EPCOS polyester film capacitors do coupling extremely well and produce a brighter, grainy, and crystal clear sound. Specs: Power: 25W, 4Ω, 20W, 8Ω Dynamic range : 103 dB Net Weight: 0.5 kg External dimensions : 150 x 92 x 43mm (including protruding parts) Panel Color: Black / Silver / Gold Fit Color: Black Housing Material : Aluminum Housing Process: Sandblasting + pull grain oxide Screen technology: Laser engraving Signal Input : RCA gold-plated lotus pedestal signal input Signal output : 4-wire signal output Power supply : DC12-24V external diameter 5.5mm diameter 2.1mm ungrateful positive Circuit plate : 1.6mm thick all-glass immersion gold