Mackie MR3STK Quick Start Guide - Page 5

MR3STK/MR3SWTK Specifications System: Freq. Range (-10 dB): 140Hz-21kHz Freq. Response (-3 dB): 180Hz-19kHz Horz. Coverage Angle (-6 dB): 110°, averaged 800Hz-16kHz Vert. Coverage Angle (-6 dB): 110°, averaged 800Hz-16kHz Directivity Factor Q (DI): 8.5 (9.3), averaged 800Hz-16kHz System Sensitivity 1: 89 dB, 1W@1m Rated Maximum SPL: 108 dB @ 1 m (3.3 ft) peak Rated Nominal Impedance: 4Ω (bypassed) System Input Power Rating 2: 35W IEC, 140W Peak Recommended Amplifier 3: 250W RMS Constant Voltage: 25V, 50V, 70V, 100V Power Taps: 1W, 2.5W, 5W, 10W, 20W Crossover Frequency: 6.0kHz Physical: Enclosure: 45° back angles, high density polystyrene Attachment Inserts: 4 integrated threaded insert points Color: Matte black (MR3STK) White (MR3SWT) Grille: Matching perforated steel grille Input Connectors: Spring-loaded terminal Dimensions HxWxD: 8.27 in x 5.91 in x 5.31 in (210 mm x 150 mm x 135 mm) Net Weight: 5.5 lb (2.5 kg) Options: MA3-5 (MA3-5W): Articulated surface mount Black (White) MA3-6 (MA3-6W): U-bracket Black (White) MA-7B (MA-7W) Wall-mount support bracket Black (White) Transducers: Low Frequency: 4.75" (120 mm) carbon fiber woofer High Frequency: 0.5" (13 mm) titanium metalized dome tweeter, Ferrofluid cooled 1 Measured on-axis in the far field with 1 watt (2.00V RMS @ 4Ω ) input and referenced to 1 meter distance using the inverse square law. Listed sound pressure represents an average from 300Hz to 3kHz. 2 IEC Spectrum, peak for 2 hours with +4.5 dB crest factor. 3 Recommended amplifier is a power capability value that should be taken as a guide. 5