Description
RDL FLAT-PAK POWER AMPLIFIER MODULES
Versatile, single-channel, utility building blocks in the popular Radio Design Labs ‘Flat-Pak’ packaging, which will mount directly to surfaces or using a range of mounting options. Inputs are electronically balanced and both eight ohm and 70/100V line models are offered, both powered by external 24 volt supplies, solving many varied requirements in most audio engineering environments. All models feature a compressor, automatically adjusting to avoid clipping and maximise audible level from the power available.
FP-PA20
The FP-PA20 offers an output of 20W RMS into an eight ohm load. Audio levels that could cause the amplified output to clip are compressed according to two dynamic time constants. 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 compressor is designed to remain aurally transparent while maintaining clean, un-clipped amplified audio for input overloads of up to 20dB. Average audio levels and audio clarity result that are normally expected of amplifiers delivering much higher output power.
Built in a black extrusion, the amplifiers have gain control and LEDs for power and peak level. Connections are by detachable terminal block. A co-axial connector provides an alternative connection for the DC power input. For full RMS output power, a 24V DC 2 amp power supply is required. A 1 amp supply is sufficient for normal program audio levels and content. Order power supply separately.
Input: Nominally +4dBu / -10dBV, minimum (to cross compressor threshold) -26dBu / -28dBV, maximum +23dBu / +15dBV, 20kohms / 10kohms, balanced / unbalanced. Compressor threshold: 6dB below rated output. CMRR: better than >55dB, 50Hz-120Hz.
Response: 35Hz - 50kHz +/- 1.5dB*. Distortion: less than 0.1%, 0.5% at 1kHz and 50Hz - 20kHz respectively*, THD+N. Output: 20W RMS, 8ohms load. Power source: 24V DC, 2A, ground referenced, for continuous 20W RMS power output; 24-33V DC, 1A for normal programme material with minimal compression. Ambient: 0-30°C, (20°C recommended). Dimensions: 82.6 x 153 x 58.5 (w x l x h) mm. ( *at compressor threshold level equivalent to 4W RMS output power).
Mounting: The Flat-Pak range all have the same width, with mounting flanges that offer a variety of fixing options. The flanges have notches for simple fixing to a surface using screws and, using special mounting brackets, can be slotted onto RDL 2U rack-mounting panels.
Included accessories: Datasheet.
Optional accessories: RDL PS-24V2 universal in-line power supply, 24V 2A output, requires IEC cordset. See RDL Flat-Pak Mounting Accessories for hardware, including dedicated mounts for FP-PA20 modules and FP-PA20 plus power supply pole-mounts.
FP-PA20A
The FP-PA20A offers an output of 20W RMS into 70V or 100V lines, highly applicable to local zones in multi-zone PA installations. It is essentially similar to the FP-PA20, but has three output terminals for common, 70V 100V.
Specification is the same as the FP-PA20, except for the following. Response: 50Hz-20kHz +/- 3dB*. Output: 20W RMS, 70V or 100V line load.