The FP-PA35A is the ideal choice in many applications where multiple 25 V, 70 V or 100 V speakers in a zone need to be powered from a single audio power amplifier.The FP-PA35A features a balanced line level input that may be connected unbalanced. A front panel gain control is designed to be adjusted manually or with a trimming screwdriver. The gain range will accommodate standard unbalanced levels as well as professional balanced levels. Multiple distributed sound system speakers connect to the corresponding 25 V, 70 V or 100 V amplified output.The FP-PA35A includes an analog compressor/limiter for audio fidelity audibly superior to conventional class D amplifiers with digital limiting. The input GAIN setting determines whether the limiter alone is used for clipping suppression, or if the full compressor/limiter will be used to substantially increase the average output power beyond that of a standard 35 W amplifier. A red COMPRESSION LED flashes when the limiter is preventing output clipping. Normal audio level signals remain unaffected by the compressor thereby preserving audio dynamics. If the input level is increased so that the compressor is active, the LED remains dimly lit between peak flashes. The audio is compressed according to three dynamic time constants providing aural transparency while maintaining clean, unclipped amplified audio for input overloads of up to 20 dB. The FP-PA35A, with compression, is capable of producing average audio output levels and clarity normally expected from amplifiers with a much higher output power rating.Main Features:35 Watts RMS Constant Voltage Amplifier25 V, 70 V or 100 V OutputPlenum Rated per UL 2043 StandardAutomatic Energy-Saving Sleep ModeSelectable Sleep Delay: Off, 5, 15, 25 MinutesInput / Output Terminal Block ConnectionsLine Level Balanced or Unbalanced InputCompressor/Limiter Controls ClippingLED to Indicate Audio Compression ThresholdCompressor Produces Maximized Average Output PowerAudio Quality Superior to Standard AmplifiersUltra-compact All Metal ConstructionHigh-Efficiency Class D OperationThermal and Short-Circuit ProtectionSpecifications:Input: Line level (+4 dBu nominal balanced; -10 dBV nominal unbalanced)Input Impedance: 20 k balanced bridging; 10 k unbalancedInput / Output Connectors :Detachable terminal blockGain Adjustment: Single turn audio taperMinimum Input Levels: Balanced: -14 dBu; Unbalanced: -15 dBV (to cross compressor threshold)Maximum Input Levels: Balanced: +22 dBu; Unbalanced: +20 dBVFrequency Response: 50 Hz to 20 kHz ( 3 dB)THD+N: < 0.5% (1 kHz at compressor threshold); < 0.5% (50 Hz to 20 kHz, 1 W)Compressor: Threshold 2 dB below rated output, automatic adjusting attack and release timesNoise: <-75 dB (below 35 W RMS)CMRR: > 60 dB (50 Hz to 120 Hz)Output Power: 35 W RMS @ 25 V, 70 V or 100 VSleep Mode Power Consumption: < 1 W (amplifier and included power supply)Sleep Mode Delay: 5, 15 or 25 minutes (selectable)Sleep Mode Disable: SelectableActive Mode Delay: < 150 mS after input audio detectedAudio Detector Threshold: -50 dBu balanced, -52 dBV unbalancedAmbient Operating Environment: 0 C to 40 C Maximum; 20 C RecommendedIndicators (2):Red LED: PEAK LED indicates compressor activityBlue LED: Power ON, Dim: Sleep mode active; Bright: Amplifier activePower Supply (included): 100 to 240 Vac, 50-60 Hz, 1.3 A, IEC C14; Output to module: 24 Vdc, 2 A, Ground-referencedPlenum Rating Standard: UL 2043Dimensions: Height: 2.80 in.(7.1 cm); Width: 3.25 in.(8.26 cm); Length: 6.04 in.(15.3 cm)Package Type: Cardboard BoxPackage Dimensions: 8 x 6.5 x 3.25 in.Shipping Weight: 3.34 lbs.WEEE weight: 2.475 lbs.Tariff code: 8543.70.9910