srm450 the mackie srm450 is a full range portable active loudspeaker system providing high output wide dispersion and low distortion performance in a compact composite molded enclosure two amplifiers independently power a high precision 12-inch professional woofer and 1.75-inch diaphragm titanium compression driver with a 1-inch exit throat a sophisticated electronic control system provides phase correction crossover and five modes of thermal and active system protection the srm450 is fitted with a specially designed horn assembly that combines both an exponential and conical geometry with the addition of a multi-cell horn throat aperture the complete assembly provides unparalleled dispersion characteristics the result is super smooth lowdistortion linear audio performance across the entire specified coverage angle of 90 degrees a servo feedback circuit has been added to the lowfrequency amplifier in order to provide extended bass response and woofer control this design provides simult
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speaker srm450 system acoustic frequency response 3 db frequency range 10 db directivity factor q di active speaker system low frequency section number of drivers woofer diameter voice coil diameter power handling sensitivity frequency range magnet type srm450 specifications 55 hz-18 khz 45 hz-20 khz 9.95 9.98 averaged 2 khz to 10 khz max spl long-term 124 db max spl peak 127 db crossover linkwitz-riley 24 db/octave 1600 hz audio input bal unbal female xlr loop-through parallel w/input bal unbal male xlr input protection rfi and level protected level control rotating knob off to +40 db sensitivity center detent line +4 dbu mic 36 dbu maximum input level +22 dbu low-cut frequency 75 hz second-order high-pass filter acoustic contour equalization peaking +3 db 100 hz +3 db 12 khz accessory interface ±15 vdc normalized signal i/o operating temperature range 10°c to 45°c 14°f to 113°f amplifiers total amplifier power 400 watts continuous high frequency 100 watts type class ab rated
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srm450 90° 120° active speaker system srm450 vertical polars 90° 60° 120° 60° 150° 30° 200hz 150° 30° 500hz 180° 36 12 0° 250hz 315hz 400hz 180° 36 12 0° 630hz 800hz 1khz 210° 330° 210° 330° 240° 270° 90° 120° 300° 240° 270° 90° 300° 60° 120° 60° 150° 30° 1.25khz 150° 30° 3.15khz 180° 36 12 0° 1.6khz 2khz 2.5khz 180° 36 12 0° 4khz 5khz 6.3khz 210° 330° 210° 330° 240° 270° 300° 240° 270° 300° 90° 120° 60° srm450 vertical off-axis frequency response up 10 150° 30° attenuation db 0 0 deg 10 deg 8khz 10 20 deg 30 deg 180° 36 12 0° 10khz 12.5khz 16khz 20 40 deg 30 20 100 1000 10000 20000 frequency hz 210° 330° 240° 270° 300° srm450 vertical off-axis frequency response down 10 attenuation db 0 0 deg 10 deg 10 20 deg 30 deg 3 o fo f66 paag e se s p g 20 40 deg 30 20 100 1000 10000 20000 frequency hz
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srm450 0° 330° 12 active speaker system srm450 horizontal polars 0° 30° 330° 12 30° 300° 36 60° 200hz 250hz 90° 270° 300° 36 60° 500hz 630hz 90° 800hz 1khz 270° 315hz 400hz 240° 120° 240° 120° 210° 180° 0° 330° 12 150° 210° 180° 0° 150° 30° 330° 12 30° 300° 36 60° 1.25khz 1.6khz 90° 270° 300° 36 60° 3.15khz 4khz 90° 5khz 6.3khz 270° 2khz 2.5khz 240° 120° 240° 120° 210° 180° 0° 330° 12 150° 210° 180° 150° 30° 300° 36 60° 8khz 10khz 90° 270° 12.5khz 16khz srm450 horizontal off-axis frequency response 10 0 240° 120° attenuation db 0 deg 10 deg 10 210° 180° 150° 20 deg 30 deg 20 40 deg 30 20 100 1000 10000 20000 frequency hz 4 o fo f66 paag e se s p g
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srm450 active speaker system srm450 frequency response on-axis 110 spl 100 db 1khz ref 100 90 80 70 20 100 1000 10000 20000 frequency hz srm450 beamwidth vs frequency 360 20 srm450 directivity index 100 6 db beamwidth degrees 240 180 120 60 0 20 10 10 vert bw horz bw 100 1000 10000 20000 0 20 100 1000 10000 1 20000 frequency hz frequency hz srm450 input panel 120 vac 60hz 320w designed by mackoids in woodinville wa · usa srm450 dimensions 15.4 in/390 mm 14.8 in/376 mm 15.4 in/390 mm 5 o fo f66 pagese s pag directivity factor q 300 directivity index di db 26.0 in/660 mm 14.8 in/376 mm
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speaker srm450 active speaker system thermal protection shall be provided by a thermal sensor mounted on the heatsink which monitors the heatsink temperature and triggers the thermal protection circuit should the temperature exceed 158° f 70° c the thermal led shall light and the input signal to the amplifiers shall be muted until the heatsink cools to a safe operating level at which point the thermal protection circuit auto-resets and normal operation resumes overload protection for the lf driver shall be provided by a dynamically variable high-pass filter the corner frequency of which shall slide from 40 hz to 120 hz as the lf amplifier output approaches clipping additional protection shall be provided for both the lf and hf drivers by a compressor circuit which monitors the low-frequency and high-frequency amplifier outputs and reduces the gain as the amplifiers approach clipping the system shall include an xlr input connector an xlr loop-through signal connector a level control ca
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