Ashly FET-2000M User's Manual
Contents
1. FET 2000C shly the first professional audio manufacturer to release a MOS FET power amplifier is proud to introduce the next generation the FET 2000 Series During its first decade our original FET Series became a standard for applica tions requiring the utmost in sonic excellence and extreme reliability We now improve upon that reputation by offer ing more models with better specifications than ever before The FET 2000 series is offered in two vari ations The FET 2000M features LED meters and balanced XLR or 1 4 inputs This design is intended for demanding sound reinforce ment broadcast facilities recording studios or any application where visual monitoring and interfacing with balanced equipment is essential The FET 2000C is designed to meet the needs of professional industrial installations such as theater public address and stadium use In these situations meters and XLR inputs are not typically required so the FET 2000C is supplied without meters and uti lizes bartier strip and 1 4 inputs This amplifier provides all of the same perfor mance benefits as the FET 2000M at a lower cost The FET 2000 series represents Ashly s ongoing dedication to extending the bound aries of technology Simple stable circuitry produces better sound Ashly MOS FET amplifiers use a complementary all discrete design The driver is pure class A and because it has only two stages requires lit tle compensati2. oad The amplifier shall be immune to damage from shorted open or mis matched loads The amplifier shall have a gain of 29dE 5dB per channel and an input sensitivity of 1 7 Volts 2 for full rated output Frequency response shall be 10Hz to 20kHz 5dB It shall be stable into any load including pu pacitors and inductors Hum and noise shall be at least 110dB below full output and ntermodulation distortion shall be less than 01 at fi put The ampli fier shall have rear panel switching for mono and bridging modes and rear mounted level controls The inputs shall be balanced bridging type with male and female XLR type con nectors as well as 1 4 phone jacks A three color LED type indicator shall be employed to show the power level of each channel and self contained forced air cooling shall be used The power output devices shall be of the Lateral MOS FET type The amplifier shall weigh 55lb net and mount in a standard 19 inch rack using three spaces 5 25 high The power requirement shall be 1 10 125VAC 60Hz The power amplifier shall be an Ashly FET 2000M Ashly Model 2000C The power amplifier being of two channels shall deliver a minimum power of 250 watts per channel into 8 ohm loads 400 watts per channel into 4 ohm loads or 600 watts per channel into 2 ohm loads with both channels operating When switched into bridged mono mode it shall deliver at least 500 watts into a 16 ohm load 800 watts into an 8 ohm load or 1200
3. on allowing both speed and linearity with no crossover notch distortion The output stage consists of paralleled power MOS FETs for current gain The MOS FETs have smooth transconductance curves and run at a relatively high idle cur rent again preventing crossover notch dis tortion They require no dissipation limiting protective circuitry and provide virtually infi nite power gain keeping load reflections from the driver stage This promotes stability and low distortion when driving reactive loads like loudspeakers Special attention is paid to overload per formance when an Ashly amp is overdriven it will clip cleanly with a slightly rounded edge totally free from spikes and glitches Total immunity to power supply variations insures that transient distortions are never generated on program material with wide dynamic range The result powerful and quick amplifiers that deliver unrestrained uncolored sound quality with remarkable accuracy To ensure compatibility with every installa tion and insure the protection of every user Ashly power amplifiers are listed with U L Plus each is backed by Ashly s exclusive five year worry free warranty Power Amplifiers model FET 2000M model FET 2000C U L Listed Five Year Worry Free Warranty Class A Full Complementary Front End Modular Construction XLR and 1 4 inputs n M Models Barrier Strip and 1 4 Inputs on C Models Stereo Mono amp Bridging Mode
4. s LED meters on M models Forced Air Cooling Perfect Overload and Square Wave Response Stable Into Any Load Self Protecting Under Virtually All Conditions Specifications POWER OUTPUT EIA SPECIFICATION 1dB lt 1 THD 20Hz 20kHz STEREO Rated Per Channel 2 ohms 4 ohms 8 ohms MONO BRIDGED 4 ohms 8 ohms FTC SPECIFICATION min power lt 01 SMPTE IMD STEREO Rated Per Channel 4 ohms 8 ohms MONO BRIDGED 8 ohms 675 Watts RMS 500 Watts RMS 300 Watts RMS 1350 Watts RMS 1000 Watts RMS 400 Watts RMS 250 Watts RMS 800 Watts RMS Total Harmonic Distortion IM Distortion SMPTE IHF 004 1kHz 8Q 01 20Hz 82 05 20Hz 20kHz 82 004 89 01 822 Damping Factor Bandwidth Slew Rate Frequency Respons Rise Time Full Power Input Sensitivity Hum and Noise Power Requirement Siz gt 100 20Hz 20kHz 100kHz 50V uS 5dB 10Hz 50kHz 2uS 10 90 1 7V gt 110dB below full output 110 125VAC 50 60Hz 19 L x 5 25 H x 16 D 65 Ibs Architect s Specification Ashly Model 2000M The power amplifier being of two channels shall deliver a minimum power of 250 watts per channel into 8 ohm load 400 watts per channel into 4 ohm loads or 600 watts per channel into 2 ohm loads with both channels operating When switched into bridged mono mode it shall deliver at least 500 watts into a 16 ohm load 800 watts into an 8 ohm load or 1200 watts into a 4 ohm l
5. watts into a 4 ohm load The amplifier shall be immune to damage from shorted open or mis matched loads The amplifier shall have a gain of 294B 54B per channel and an input sensitivity of 1 7 Volts for full rated output Frequency response shall be 10Hz to 20kHz 5dB It shall be stable into any load including pure capacitors and inductors Hum and noise shall be at least 110dB below full output and SMPTE intermodulation distortion shall be less than 01 at full output The ampli fier shall have rear panel switching for mono and bridging modes and rear mounted level controls The inputs shall utilize 1 4 phone jacks as well as barrier terminal input strips Self contained forced air cooling shall be used The power output devices shall be of the Lateral MOS FET type The amplifier shall weigh 55Ib net and mount in a stan dard 19 inch rack using three spaces 5 25 high The power requirement shall be 110 125V 50 60Hz The power amplifier shall be an Ashly FET 2000C To provide maximum flexibility Ashly offers two variations in our FET Power Amplifiers The FET 2000M top features XLR and 1 4 inputs The FET 2000C bottom utilizes Barrier Strips and 1 4 inputs
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