PSW-4 Self-Powered Reinforcement Subwoofer 21 1/4" wide 39" tall 30" deep 205 lbs (93 kg) Max SPL (Peak): 136 dB Freq Range: 32-160 Hz
Features High power Extremely low distortion Reliable and durable Compact and easily handled Integral amps and controllers Intelligent AC ™	Applications Main PA arrays Concert reinforcement Concert, film and theater Portable reinforcing Live music club systems Bass instrument amplification

The PSW-4 is a self-powered, dual-tuned subwoofer that incorporates one 15" and one 18" driver, to give a frequency response of 32 Hz to 160 Hz. Being self-powered , all of the amplifier and controller electronics are contained within the speaker enclosure.

The unit is designed to be a companion to the MSL-4 (whenever more lower frequency power is needed), but can be used in any situation where a high-energy, easy-to-use, true-sounding subwoofer is needed.

The PSW-4 incorporates the Intelligent AC ® system, which provides for automatic voltage selection, EMI filtering, soft current turn-on, surge suppression and dual circuit breakers. Simply apply a signal source and a power connection and the unit is fully operational.

The cooling, power supply and amplifier subsystems are all built for maximum efficiency and reliability. In the event that servicing is needed, it is aided by the PSW-4's modular design; the entire power/amplifier module can be accessed and replaced, if necessary.

For more information, read this article on Powered Subwoofers.

PSW-4 Specifications

Click here for a graphic of the line drawings with dimension measurements included. You can also download this product data sheet in Adobe Acrobat format.

Acoustical (each loudspeaker)
Frequency Response1	±4 dB from 32 Hz to 160 Hz
Phase Response1	±90° from 45 Hz to 110 Hz
Maximum SPL1	136 dB peak@1 meter
Dynamic Range	>110 dB
Crossover	60 Hz
Transducers
Sub Frequency	18" diameter MS-18 cone
Low Frequency	15" diameter MS-15 cone
Audio Input
Type	10k ohm impedance, electronically balanced
Connector	XLR (A-3) male and female
Nominal Input Level	+4 dBu
Amplifiers
Type	Complementary power MOSFET output stages (audio class AB/H)
Burst Capability2	1240 watts (620 watts/channel)
THD, IM, TIM	< .02 %
AC Power
Connector	250V NEMA L6-20 (Twistlock) inlet or IEC 309 male inlet 3
Automatic Voltage Selection	95-125 VAC and 208-235 VAC; 50/60 Hz 4
Operational Voltage Range	Turn on: 85 VAC; Turn off: 134 VAC; 50/60 Hz Turn on: 165 VAC; Turn off: 264 VAC; 50/60 Hz
Max Continuous RMS Current (>10 sec)	@ 115V: 8A ........ @ 230V: 4A ........ @ 100V: 10A
Burst RMS Current (<1 sec)	@ 115V: 15A ........ @ 230V: 8A ........ @ 100V: 18A
Max Peak Current During Burst	@ 115V: 22Apk ........ @ 230V: 11Apk ........ @ 100V: 25Apk
Soft Current Turn-on	Inrush current <12A @ 115V
Physical
Dimensions	21 1/4" W x 39 1/4" H x 30" D
Weight	177 lbs (80.3 kg) / shipping: 206 lbs (93.4 kg)
Enclosure	Multi-ply hardwood
Finish	Black textured
Protective Grill	Perforated steel grill, charcoal-grey foam
Rigging	Aircraft pan fittings (3 on both top and bottom). Working load for each fitting is 600 lbs, which is 1/5 the cabinet breaking strength (with straight tensile pull).

Footnotes:

1. Subject to half-space loading, measured with one-third octave frequency resolution in fixed ISO bands.
2. Nominal 8 ohm resistive load, pink noise, 100V peak.
3. Other connectors available. Fore European applications, the IEC 309 (16A) panel is used.
4. The unit is rated at 88-125V and 182-235V, 50/60 Hz, to satisfy EC standards for -10% to 6% AC line voltage.

Click here for a graphic of the line drawings with dimension measurements included. You can also download this product data sheet in Adobe Acrobat format.