The FP-PA20B features a balanced line level input that may be connected unbalanced. A front panel gain control is designed to be adjusted either manually or with a trimming screwdriver. The gain range will accommodate standard unbalanced levels as well as professional balanced levels. A 25 V amplified output is provided to drive corresponding speakers in a distributed sound system. Audio levels that could cause the amplified output to clip are compressed using two dynamic time constants designed to preserve aural transparency. Normal audio level signals remain unaffected by the compressor thereby preserving audio dynamics and preventing the compressor from increasing feedback potential when the amplifier is used for paging. The FP-PA20B produces average audio levels and audio clarity normally expected of amplifiers delivering much higher output power.Main Features:20 Watts RMS Constant Voltage Amplifier25 V OutputIntegral Audio Compressor to Control ClippingHigh Overall Operating Audio LevelMaximized Audio Level for Output PowerAudio Quality Superior to Standard AmplifiersSpecifications:Input: Line level (+4 dBu bal; -10 dBV unbal)Input Impedance: 20 k balanced bridging; 10 k unbalInput / Output Connector: Plug-in terminal blockGain Adjustment: Single turn audio taperMinimum Input Levels:Balanced: -26 dBu (to cross compressor threshold)Unbalanced: -28 dBV (to cross compressor threshold)Maximum Input Levels:Balanced: +23 dBuUnbalanced: +15 dBVFrequency Response: 50 Hz to 18 kHz ( 3 dB)*THD+N:*measured at compressor threshold level equaling 4 W RMS output power.< 0.1% (@ 1 kHz)*< 0.5% (50 Hz to 20 kHz)*Noise: < -80 dB (below 20 W RMS)Compressor: Threshold 6 dB below rated output, automatic adjusting attack and releaseCMRR: > 55 dB (50 Hz to 120 Hz)Output Power: 20 W RMS @ 25 VAmbient Operating Environment: 0 C to 30 C Max; 20 C RecommendedIndicators (2):Red LED: PEAK LED indicates compressor activityGreen LED: Power ONPower Requirement:24 Vdc @ 1650 mA, Ground referenced(for continuous RMS power output)24 Vdc @ 1000 mA, Ground referenced (for normal uncompressed audio)Overall Dimensions: Height: 2.3 in. (5.85 cm); Width: 3.25 in. (8.26 cm); Length: 6 in. (15.3 cm)Package Type: Cardboard BoxPackage Dimensions: 4.375 x 7 x 2.25 in.Shipping Weight: 2.41 lbs.WEEE weight: 2.195 lbs.Tariff code: 8543.70.9910