16SMPTE-IM, less than 0.05 %20 Hz to 20 kHz, ±0.1 dB8 Hz to 100 kHz, +0/-3 dBGreater than 2003 dB at 4 ohms (2 dB for MPA275)100 dB below rated output (20 Hz to 20 kHz)1 Vrms for rated power (8 ohms)MPA1100: 80 (38 dB)MPA750: 63 (36 dB)MPA600: 56 (35 dB)MPA400: 45 (33 dB)MPA275: 35.5 (31 dB)10 kilohms unbalanced, 20 kilohms balancedFront: AC switch, Ch 1 & Ch 2 Gain (2 dB detents). Rear: One toggle switch forparalleling inputs and for bridged output configurationPOWER: Green LEDSIGNAL PRESENT: Green LEDLEVEL -20: Green LEDLEVEL -10: Yellow LEDCLIP: Red LEDPROTECT: Red LED (flashes for over-temp)Input: Barrier strip and XLRSpeakers: 5-way binding posts, Speakon connectors, st. Speakon**Continuously variable speed fan, rear-to-front air flowFull short circuit†, open circuit, ultrasonic, and RF protection, thermal limit-ing/muting; stable into reactive or mismatched loadsOn/off muting, clip limiting, DC-fault load grounding relay with internal faultfusesComplementary linear, high-efficiency outputs: 3-step on MPA1100; 2-step onMPA750, MPA600 & MPA400; 1 step on MPA275100, 120, 220–240 Vac, 50–60 HzSee Charts on pages 9 and 10.48.3 cm (19") rack mounting,45.5 cm (17.9") deep (rear support ears),MPA1100 & MPA750 are 13.3 cm (5.25") high (3 spaces);MPA600, MPA400 & MPA275 are 8.9 cm (3.5") high (2 spaces)MPA1100: 29 kg (64 lbs) net, 31.8 kg (70 lbs) shippingMPA750: 24.9 kg (55 lbs) net, 26.8 kg (59 lbs) shippingMPA600: 20 kg (44 lbs) net, 22.2 kg (49 lbs) shippingMPA400: 19.1 kg (42 lbs) net, 21.2 kg (47 lbs) shippingMPA275: 18.1 kg (40 lbs) net, 20.4 kg (45 lbs) shippingSpecificationsDISTORTIONFREQUENCY RESPONSEDAMPING FACTORDYNAMIC HEADROOMNOISESENSITIVITYVOLTAGE GAININPUT IMPEDANCECONTROLSINDICATORS(each channel)CONNECTORS(each chan., except one stereo Speakon)COOLINGAMPLIFIER PROTECTIONLOAD PROTECTIONOUTPUT CIRCUIT TYPEPOWER REQUIREMENTSPOWER CONSUMPTIONDIMENSIONSWEIGHTGeneral SpecificationsContinued** For mating cable, use Neutrik NL4FC connector.†Output Averaging™ short circuit protection (US Patent 4,321,554).