Operating Instructions PSW-2 Self-Powered Subwoofer Patents Pending Copyright © 1997, Meyer Sound Laboratories, Inc. All rights reserved Part #: 05.047.033.
Contents Introduction .......................................................... 3 AC Power .............................................................. 3 Audio Input ........................................................... 5 Amplification and Protection Circuitry ............... 5 Rigging .................................................................. 7 Configuration, Placement, and Polarity .............. 7 Measurement and System Integration Tools ....... 8 Full-Range Systems ....................
Introduction The Meyer PSW-2 self-powered subwoofer contains independent amplifier and control electronics for two 15” drivers in a compact enclosure. The PSW-2 has the following acoustical specifications: Frequency Response ± 4 dB 35 – 120 Hz Dynamic Range > 110 dB Phase Response ± 30° 50 – 145 Hz The PSW-2 is identical in size to, and matches well with the Meyer MSL-4.
Current Requirements Safety Issues The PSW-2 presents a dynamic load to the AC mains which causes the amount of current to fluctuate between quiet and loud operating levels. Since different types of cables and circuit breakers heat up (and trip) at varying rates, it is essential to understand the types of current ratings and how they correspond to circuit breaker and cable specifications. Pay close attention to these important electrical and safety issues.
Power Connector Wiring Conventions Use the following AC cable wiring diagram to create international or special-purpose power connectors: brown = hot blue = neutral yellow/green = earth ground (chassis) AC cable color code A single source can drive multiple PSW-2s with a paralleled input loop, creating an unbuffered hardwired loop connection. Make certain that the source equipment can drive the total load impedance presented by the paralleled input circuit.
The PSW-2 performs within its acoustical specifications and operates at a normal temperature if the TPL LED is on for no longer than two seconds, and off for at least one second. If the LED remains on for longer than three seconds, the PSW-2 is hard limiting with these negative consequences: • Increasing the input level will not increase the volume. • The system distorts due to clipping and nonlinear driver operation.
Rigging The PSW-2 weighs 162 lb (73.5 kg). The maximum recommended load for a single cabinet with aircraft pan fittings is 600 lb (273kg). This working load is based on a 5:1 safety factor. The PSW-2 has six rigging brackets (three on top and bottom). Each bracket is capable of supporting the full working load of the cabinet. There are four types of interchangeable rigging brackets, each fastened by six Phillips screws: • aircraft pan fittings (ring and stud) • 3 /8”-16 nut plates • M-10 x 1.
Placement One of the most important factors governing subwoofer response is their placement relative to adjacent surfaces. Subwoofers gain significant power by coupling, or loading, with nearby floors and walls. Half-space loading describes a speaker coupling with one surface. Subs placed on the floor benefit from half-space loading, while flown subs in free-space (without a nearby wall or ceiling) do not.
PSW-2 and MSL-4 The PSW-2 is compatible with the MSL-4, CQ, and MTS-4. However, since the LF (low frequency) response for each speaker overlaps with the PSW-2, the system frequency response exhibits a rise in the range 65– 120 Hz (MSL-4), 40–120 Hz (CQ), and 30–120 Hz (MTS-4). It is important to emphasize that the speakers are in phase in this region. The rise can be corrected using the Meyer CP-10 Parametric Equalizer, if desired. The CH 1 Mid-Hi output drives the MSL-4 with the Lo Cut filter in.
Driver Troubleshooting The Remote Monitoring System (RMS) is the best method to query the status of the drivers in a system before and during the performance. RMS monitors peak power, peak voltage, and average voltage (VU) for each amplifier channel, allowing immediate detection and muting for drivers with open or shorted voice coils, with minimal disruption to the system. Contact Meyer Sound for more information about RMS.
Safety Summary English ! Français • 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. • Pour réduire le risque d’électrocution, débrancher la prise principale de l’haut-parleur, avant d’installer le câble d’interface allant à l’audio. Ne rebrancher le bloc d’alimentation qu’après avoir effectué toutes les connections.
Controls and Connectors ! WARNINGS: THIS PRODUCT MUST BE GROUNDED This surface may reach high temperatures while 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 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.
