UP 4240 is a 240 W commercial power amplifier designed for music and announcement distribution systems. It features two audio inputs including a MAIN INPUT with gain selector (MIC, MIC+PHANTOM, LINE) and priority functionality via contact closure or automatic VOX detection, plus an AUX INPUT for line-level sources. The amplifier offers flexible output options compatible with both low impedance speakers (minimum 4 Ω) and 70/100 V constant voltage lines. Front panel controls include MASTER volume and BASS/TREBLE tone adjustments, with LED indicators for operational status, protection, and signal level. Additional features include 24 V DC backup power input, voltage selector (115/230 V), and comprehensive protection circuitry. Engineered for commercial installation applications, it features metal construction and 19" rackmount format.