DS-4P Self-Powered Loudspeaker OPERATING INSTRUCTIONS OPERATING INSTRUCTIONS Superior engineering for the art and science of sound. Keep these important operating instructions.
CONTENTS Safety Summary Introduction AC Power Amplification and Protection Circuitry Rigging Complete Systems Measurement and Systems Integration Tools Driver Troubleshooting Controls and Connectors Specifications Dimensions and Contact Information 3 4 4 6 7 8 9 9 10 11 12 SYMBOLS USED THESE SYMBOLS INDICATE IMPORTANT SAFETY OR OPERATING FEATURES IN THIS BOOKLET AND ON THE CHASSIS.
! ENGLISH • To reduce the risk of electric shock, disconnect the loudspeaker from the AC mains before installing audio cable. Reconnect the power cord only after making all signal connections. • Connect the loudspeaker to a twopole, three wire grounding mains receptacle. The receptacle must be connected to a fuse or circuit breaker. Connection to any other type of receptacle poses a shock hazard and may violate local electrical codes.
DS-4P: INTRODUCTION The self-powered DS-4P is an arrayable mid-bass loudspeaker system which provides high power and extremely low distortion. It was developed to supplement the 70-200Hz band in fullrange systems, affording additional midbass headroom.The DS-4P is most effective when used in multiples within an array, and it can easily be incorporated into conventionaly powered or self-powered systems. The DS-4P uses two 12-inch cone drivers in a true horn enclosure.
current during burst is used to select the rating for fast-reacting magnetic breakers and to calculate the peak voltage drop in long AC cables according to the formula Pin 2 Pin 3 Case Vpkdrop = Ipk x Rtotal cable Do not use a ground-lifting adapter or cut the AC cable ground pin. Use the table below as a guide to select cables and circuit breakers with appropriate ratings for your operating voltage. Keep all liquids away from the DS-4P to avoid hazards from electrical shock.
AMPLIFICATION AND PROTECTION CIRCUITRY Each driver in the DS-4P is powered by one channel of the Meyer Sound MP2/DS-4P, a 1240W RMS amplifier (620W RMS/ch) utilizing complementary power MOSFET output stages (class AB/H). The following sections discuss the MP-2’s limiting circuitry and the two-fan cooling system. TRUPOWER™ LIMITING SYSTEM Conventional limiters assume that the resistance of a loudspeaker remains constant and set the limiting threshold by measuring voltage only.
RIGGING Two types of rigging hardware are available to fly the DS-4P loudspeaker system: Aircraft pan fittings and the optional L-Track system. Additionally, weather protective treatment is available for the DS-4P. With the exception of the optional rain hood, all rigging hardware is installed and tested exclusively at Meyer Sound Laboratories. The DS-4P is available with aircraft pan fittings only, L-Track only, or with both aircraft pan fittings and L-Track rigging hardware.
ALL-WEATHER RIGGING EQUIPMENT The cabinet, exposed electronic circuitry, and its accompanying drivers can receive protective treatment while still in the factory that permits safe use in wet conditions. Additionally, a rain hood can be fitted to shield cables and electronics. Do not install a unit outdoors without weather protection! Contact Meyer Sound for more information. NOTE: All Meyer Sound products must be used in accordance with local, state, federal, and industry regulations.
Figure 2 is the electrical response of the LD-1A with all three filters engaged, and polarity options equal (noninverted) as recommended in the previous (Figure 1) diagram. NOTE: The LD-1A’s DS-2P output provides a special eq filter to minimize time offset in the VLF range. The Sub Output as well as the Hi-Pass filter are gentle slopes (about 12 dB per octave) in order to minimize time offset of all three products working together through the 30 to 200 Hz passband.
DRIVER POLARITY LOUDSPEAKER SAME IN THE The polarity is correct if the frequency response is ±4dB 50–160 Hz. Cancellation greater than 6 dB in the same range indicates polarity reversal. Use the following test procedure to verify polarity between drivers in the same loudspeaker: 1. Place a measurement microphone 3 ft from the front of the loudspeaker at the midway point between the two drivers. 2. Connect a signal source to the loudspeaker and note the frequency response.
DS-4P SPECIFICATIONS ACOUSTICAL1 Frequency Response2 Phase Response2 Maximum SPL2 Dynamic Range 120° H; 120° V COVERAGE (2) MS-12 12-inch cone drivers TRANSDUCERS AUDIO INPUT 70 - 200Hz (±4 dB) ± 70° from 70 - 200Hz >142 dB SPL peak @1 meter >120 dB Type 10kW impedance, electonically balanced Connector XLR (A-3) male and female Nominal Input level +4 dBu (1.23 Vrms) Type Complementary power MOSFET output stages (class AB/H) Burst Capability3 1240 Watts (620W per channel) THD, IM, TIM < .
PHYSICAL DIMENSIONS All units in inches. 30.00 22.00 2.63 WARNINGS: THIS PRODUCT MUST BE GROUNDED This surface may reach high tempuratures white in use. To ensure proper operation, allow at least 6 inches clearance from this surface and adequate ventilation. To reduce the risk of electric shock do not remove cover. No operator or serviceable parts inside. Refer servicing to qualified personnel. To reduce the risk of fire or electric shock do not expose this appliance to rain or moisture.
