The ESP-15S is a compact reflex-loaded powered subwoofer using a single 4” (101.6mm) voice coil 15” (381mm) low frequency transducer, and is designed to complement and provide extended low frequency response for the ESP-8 and ESP-12 compact coaxial powered loudspeakers.

The ESP-15S utilises the latest in Class D amplifier technology, with a compact and lightweight module delivering a total power of 1200W RMS to the single drive unit. The amplifier power supply is a universal voltage design, meaning the ESP-15S will operate happily across the globe. The amplifier is primarily passively cooled via the substantial heat sink on the rear of the enclosure, however for high temperature scenarios a fan is present within the loudspeaker itself to cool critical components. Four presets are available in the ESP-15S – each one with a different low pass filter frequency to enable the user to tailor the characteristics of the subwoofer to their personal taste.

The ESP-15S has a combination XLR/1/4” jack input, and a male XLR link output. LED indicators for power, status and preset are provided on the rear panel, along with preset selection controls and a level control, and mains supply is handled by Neutrik® PowerCON True1 inlet and link output connectors. The ESP-15S also comes supplied with a 3m True1 power cable, as well as the loose link output connector for assembling link mains cables.

The drive unit is housed within a compact, vented enclosure, constructed from premium 15mm (5/8”) multi-laminate Birch plywood and heavily braced to minimise panel resonance. As standard, the ESP-15S is fitted with rubber feet underneath and matching recesses on top to allow stable stacking of multiple enclosures, and two flush handles are provided on the sides for easy lifting of the 40.3kg (88.9lbs) loudspeaker. An M20 threaded polemount adapter is provided on the top for stand mounting ESP series loudspeakers. Lastly, a tough hex-punched steel grille backed with acoustically transparent fabric protects the drive unit from damage – this grille can quickly and easily be removed for service purposes.