User manual MACKIE HD1501

[. . . ] HD1501 15" Powered Subwoofer OWNER'S MANUAL HD1501 Important Safety Instructions 1. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat. Do not defeat the safety purpose of the polarized or grounding-type plug. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet. [. . . ] THERMAL LED The HD1501 is equipped with a thermal protection circuit that monitors the internal temperature of the amplifier and heatsink. If the temperature begins to exceed a safe operating level, this indicator lights and the amplifier output is limited to allow the amplifier to cool. If the amplifier becomes excessively hot, the amp is muted until it cools, then the HD1501 returns to normal operation. When the HD1501 is in thermal protect mode, the power LED (2) will remain lit, indicating that the unit is still powered on despite the lack of output. If POWER LIGHT ON (7) is engaged, the front panel power LED will go out when in thermal protect mode. Activation of the thermal protection circuit is an indication that you should take steps to avoid continued thermal problems. SERIAL NUMBER REVISION TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. REFER SERVICING TO QUALIFIED PERSONNEL. POWER Owner's Manual 9 HD1501 The Ins and Outs of Polarity Mackie's HD-Series Powered Subwoofers include a switch that allows you to quickly invert the polarity of the subwoofer's output relative to the input signal it is receivingfromthemixerorothersoundsource. But what exactly does that mean?A subwoofer works by literally pumping air as the woofer cone moves in and out with respect to the cabinet in which it is housed. It does so according to the low-frequency portion of the signal it receives from the sound source. The woofer cone is simply following the waveform as seen in the sine wave in Figure 1. Likewise, as the sine wave falls, the woofer cone pulls into the cabinet. A musical signal is much more complex, of course, but the same principle applies. Movement of the woofer cone causes air pressure changes that we perceive as sound. WhenthePolarityInvertswitch[6]isengaged, the originalwaveformissimplyreversed180º(seeFigure 2). However, this time the woofer cone starts by pulling into the cabinet followed by the woofer cone pushing out. If you have ever experimented with a subwoofer polarity switch, you may not have noticed any changes to the sound regardless of its position, especially if you are listening to just the subwoofer. The polarity invert switch comes into play when the HD1501 subwoofer is paired with a loudspeaker. Ideally, the woofer cones of the subwoofer and full-range loudspeaker would work together by pushing and pulling in unison. HD-Series subwoofers are designed to be used in a broad range of applications, and with a wide variety of full-range loudspeakers. The flexibility provided by the polarity switch is necessary to ensure that you are receiving the best possible sound from your system, regardless of your setup. Listed below are some recommended configurations for pairing a Mackie HD-Series subwoofer (using the High-Pass output) with a Mackie full-range loudspeaker. [. . . ] Butterworth High Pass Filter Amplifier mute, auto reset, twin thermally controlled vari-speed fans Peak/RMS Limiter Power Light ON, Polarity Invert, Thermal, Sig/Limit, Front Power ON Transducer Diameter: Voice Coil Diameter: Diaphragm Material: Magnet Material: 15. 0 in / 381 mm 3. 0 in / 76 mm Paper Ferrite Driver Protection: Display LEDs: AC Power Requirements US: Europe: 100-120 VAC, 50-60 Hz, 300 watts 220-240 VAC, 50-60 Hz, 300 watts 3-pin IEC 250 VAC, 15 A male Power Amplifier Rated Power: THD: Design: Cooling: 600 watts rms 1200 watts peak < 0. 03% Class D Active, twin thermally controlled vari-speed fans AC Connector: Construction Features Basic Design: Material: Finish: Handles: Rectangular 15 mm exterior grade premium birch plywood High durability black paint One on each side Powder-coated galvanized steel Input/Output Input Type: Female XLR Balanced differential (stereo left/right) 20 k Male XLR Balanced (parallel with input) Male XLR Balanced 300 ­6 dB to +6 dB Grille: Physical Properties Height: Width: Depth: Weight: 20. 0 in / 508 mm 18. 25 in / 464 mm 25. 0 in / 635 mm 80. 0 lb / 36. 3 kg Input Impedance: Full Range Output: High Pass Output: Output Impedance: Level Control: Mounting Methods Floor mount only WARNING: The cabinet has no rigging points and is not suitable for rigging. NEVER attempt to suspend the HD1501 by its handles. Electronic Crossover Crossover Type: 24 dB/oct. Symmetrical Linkwitz-Riley 100 Hz Disclaimer Since we are always striving to make our products better by incorporating new and improved materials, components, and manufacturing methods, we reserve the right to change these specifications at any time without notice. "Mackie" and the "Running Man" figure are registered trademarks of LOUD Technologies Inc. [. . . ]