Ashly FET-1500M User's Manual
Contents
1. FET 1500C shly the first professional W audio manufacturer to release W a MOS FET power amplifier A W is proud to introduce the next W generation the FET 1500 W Series During its first Mm E decade our original FET Series became a standard for applications requiring the utmost in sonic excellence and extreme reliability We now improve upon that reputation by offering more models with better specifi cations than ever before The FET 1500 series is offered in two variations The FET 1500M features LED meters and balanced XLR or 1 4 inputs This design is intended for demanding sound reinforcement broadcast facilities re cording studios or any application where visual monitoring and interfacing with bal anced equipment is essential The FET 1500C is designed to meet the needs of professional industrial installa tions such as theater public address and stadium use In these situations meters and XLR inputs are not typically required so the FET 1500C is supplied without meters and utilizes barrier strip and 1 4 inputs This amplifier provides all of the same performance benefits as the FET 1500M at a lower cost The FET 1500 series represents Ashly s ongoing dedication to extending the ama Deto MIJ FET Pouar Arysta a a ELIN eee rersccoc boundaries of technology Simple stable circuitry produces better sound Ashly MOS FET amplifiers use a complemen tary all dis2. 2 Pe n P d fa i Specifications Ashly Audio Inc Since 1972 1989 Ashly Audio Architect s Specification Ashly Model 1500M The power amplifier being of two channels shall deliver a minimum power of 175 watts per channel into 8 ohm loads or 275 watts per channel into 4 ohm loads with both channels operating When switched into bridged mono mode it shall deliver at least 550 watts into an 8 ohm load The amplifier shall be immune to damage from shorted open or mismatched loads The amplifier shall have a gain of 29dB 5dB per channel and an input sen sitivity of 1 3 Volts 2 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 amplifier 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 connectors 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 out put devices shall be of the Lateral MOS FET type The amplifier shall weigh 371b net and mount in a standard 19 inch rack using two spaces 3 5 high The power requirement shall
3. be 110 125VAC 50 60Hz The power amplilier shall be an Ashly FET 1500M Ashly Model 1500C The power amplifier being of two channels shall deliver a minimum power of 175 watts per channel into 8 ohm loads or 275 watts per channel into 4 ohm loads with both channels operating When switched into bridged mono mode it shall deliver at least 550 watts into an 8 ohm load The amplifier shall be immune to damage from shorted open or mismatched loads The amplifier shall have a gain of 29dB 5dB per channel and an input sen sitivity of 1 3 Volts 2 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 amplifier 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 terminal barrier 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 371b net and mount in a standard 19 inch rack using two Spaces 3 5 high The power requirement shall be 110 L25VAC 50 G0Hz The power amplifier shall be an Ashly FET 1500C
4. crete design The driver is pure class A and because it has only two stages requires little compensation allow ing 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 transconduc tance curves and run at a relatively high idle current again preventing crossover notch distortion They require no dissipa tion limiting protective circuitry and pro vide virtually infinite power gain keeping load reflections from the driver stage This promotes stability and low distortion when driving reactive loads like loud speakers Special attention is paid to overload performance when an Ashly amp is over driven it will clip cleanly with a slightly rounded edge totally free from spikes and glitches Total immunity to power supply variations insures that transient distor tions are never generated on program material with wide dynamic range The result powerful and quick ampli fiers that deliver unrestrained uncolored sound quality with remarkable accuracy Each Ashly power amplifier like all Ashly products is now fully covered by our exclusive five year worry free warranty Pa di dadd E y a Y ee aan rFerteci Overioaaq 4 d D an ANC sT IE geome wy I J A rel pa Y ea _ s Power Amplifiers model FET 1500M model FET 1500C Voces f a y 3 slereo Mono gt s oloilnlo milo 3
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