User manual MACKIE MR4 DATASHEET

[. . . ] The high-frequency section features a constant directivity horn with a built-in mechanical phase equalizer. The horn is driven by a Ferrofluid® cooled, 0. 5" Mylar® dome tweeter. The system is nominally crossed over at 4kHz by a 12 dB/octave network, which uses markedly lower (than conventional) inductance values in series with the woofer. [. . . ] Frequency Directivity Index 6. 57" (167mm) 3. 58" (91mm) 45 ° 45° 6. 57" (167mm) 4. 84" (123mm) 1. 25" (32mm) 1. 73" (44mm) TOP SIDE 7. 17" (182mm) 4. 70" (119. 5mm) 2. 5" (63. 5 mm) 10. 32" (262mm) 5. 61" (142. 5mm) 2. 04" (52mm) FRONT REAR 5 O FoF66 PAGESE S PAG SPEAKER MR4/4T Compact Two-Way Speaker The two-way loudspeaker system shall be self-contained and consist of the following components: (1) a low-frequency driver; (2) a constant directivity horn driven by a dome tweeter driver; (3) a two-way crossover network; (4) a constant voltage transformer; (5) a vented enclosure. The low-frequency transducer shall be a cone type loudspeaker having a carbon fiber cone with a diameter of at least 5 inches (130mm). It shall present a nominal load impedance of 8 ohms to the crossover network. The high-frequency section shall consist of a constant directivity horn driven by a Mylar® dome tweeter having a diameter of at least 0. 5 inches (12. 7mm). Its voice coil shall be treated with Ferrofluid® to aid in cooling. It shall present a nominal load impedance of 8 ohms to the crossover network. The system shall be crossed over by an internal, highlevel, passive network having a response of 12 dB/octave and equalization for the constant directivity horn. The nominal crossover frequency shall be 4kHz. The low-pass section of the network shall have minimum inductance in series with the low-frequency driver. A dynamic high-frequency protection circuit based on a low value, low mass filament resistor shall limit the current available to the high-frequency driver. The crossover network shall present a nominal 4-ohm load impedance to the power amplifier or built-in constant voltage transformer. The constant voltage transformer shall have multiple power taps at 1, 5, 10, 20 and 30 Watts. It shall also have voltage taps at 25, 50, 70 and 100V. Two detented rotary switches shall be provided on the input panel to adjust the power and voltage taps of the transformer. The voltage tap switch shall have a position to bypass the transformer and allow the loudspeaker to present a 4-ohm load to a directly coupled power amplifier. It shall be constructed using high density polystyrene and finished with black (or white), scratch resistant paint. It shall be trapezoidal in shape with 45° angled sides. A full size, detachable, perforated steel grille, finished in black (or white) scratch resistant paint shall be provided. [. . . ] New material, production methods, and design refinements are introduced into existing products without notice as a routine expression of that philosophy. For this reason, any current Mackie Industrial product may differ in some respect from its published description, but will always equal or exceed the original design specifications unless otherwise stated. Mackie and the "Running Man" symbol are registered trademarks of Mackie Designs Inc. [. . . ]