The PSRX728S is a high power
subwoofer system containing two
2268H neodymium magnet, patented*
Differential Drive®, 18″ woofers in a
front-loaded, vented enclosure. The
enclosure is designed to present a
minimum frontal area. The system
offers complete input connection
flexibility for compatibility with a
variety of cabling schemes. A recessed,
external switch allows selection of
either contacts +1/-1 or +2/-2. By
relocating an internal connector, it is
also possible to drive each woofer
discretely from a separate amplifier
The enclosure is constructed of top
quality birch plywood and coated in
PROEL AUDIO’s rugged DuraFlex™ finish. Each
woofer is housed in an isolated
chamber and the enclosure is heavily
braced to maximize low-frequency
performance. The attractive CNC machined, 16-gauge steel grille is
internally lined with acoustically
transparent foam to provide additional
driver protection and give a very
professional appearance.
*U.S. Patent 5,748,760; other U.S. and foreign patents
Frequency Range (-10 dB): 27 Hz – 220 Hz
Frequency Response (±3 dB): 33 Hz – 220 Hz
Input Connection Modes: Switchable, +1/-1 or +2/-2
Internally selectable, Parallel or Discrete
Recommended Crossover Frequencies: 80 Hz, 24 dB / octave HPF
80 Hz, 24 dB / octave LPF
Power Rating
(Continuous 1 / Program / Peak): Parallel: 1600 W / 3200 W / 6400 W
Maximum SPL2
: 136 dB SPL peak
Sensitivity (1w @ 1m): 98 dB SPL
LF Driver: 2 x PROEL AUDIO 2268H 457 mm (18 in) Differential Drive
woofer with neodymium-magnet and dual voice-coils
Nominal Impedance: Parallel: 4 ohms
Discrete: 8 ohms x 2
Active Tunings: dbx DriveRack, all models. Settings available at
Enclosure: Rectangular, 18 mm, 13-ply birch plywood
Finish: Black DuraFlex finish
Grille: Powder coated, black, 16-gauge perforated steel with
acoustical transparent charcoal foam backing.
Removable PROEL AUDIO badge and punched  logo.
Input Connectors: Neutrik® Speakon® NL-4 (x2)
Dimensions (H x W x D): 602 mm x 1067 mm x 838 mm
(23.7 in x 42 in x 33 in)
Net Weight: 76 kg (166.5 lb)
Optional Accessories: SRX728S-CVR: Pull-over padded cover


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