Description
The compact enclosure is constructed from premium 18mm (3/4”) multi-laminate Birch plywood, and houses a single 4.5” voice coil, 18” (457mm) neodymium LF drive unit. The enclosure includes a single M20 threaded polemount adapter, allowing the mounting of EMS Series fullrange loudspeakers above. Also as standard, the S-18 is supplied with castors for the rear and is fitted with rubber feet underneath and matching recesses on top to allow stable stacking of multiple enclosures. Two Neutrik® speakON™ NL4 connectors are provided for input and enclosure link, and a pair of steel bar handles allow easy lifting. Lastly, a tough hex-punched stainless steel grille protects the drive unit from damage whilst in use or in transit. The enclosure is finished in an impact and weather resistant black or white textured polyurethane finish as standard, though RAL colour matching and enhanced weather-protected outdoor options are available.
The S-18 requires an active crossover to function correctly – although the choice of filter points is very wide, allowing the user to tailor the response to exactly what is required. Cardioid DSP program settings are also available to create arrays with significant rejection to the rear of the subwoofers, by stacking three enclosures in a block (two facing forwards, one facing backwards).
The S-18 can add low frequency power and extension to systems based around any EM Acoustics fullrange product, or for fullrange products from other manufacturers. The S-18 requires external active high/low pass filters and a single amplifier channel to function correctly – as such it is recommended to be used with EM Acoustics’ range of Advanced System Amplifiers. It is however possible to use other DSP-enabled amplifiers, or conventional amplifiers with external DSP. Suitable DSP settings are provided on the EM Acoustics website. The amplifier should be capable of delivering 1500-2000W RMS into a 4-ohm load. For cardioid arrays, separate amplifier channels are required for the rear-firing subwoofer(s) due to the different processing needed.