The SN Series II transducers represent a unique combination of extremely high performance and high value. The SN-18LF utilizes a medium format 3 inch (76.2mm) diameter voice coil coupled to a computer optimized Neodymium based permanent magnet system. This voice coil and magnet structure combination insures very high conversion efficiency and an excellent performance to value ratio. The SN-18LF is an 18 inch (460mm) diameter low frequency design that has a rated bandwidth of 40Hz to 125Hz. This bandwidth provides an optimum combination of low frequency response and efficiency. It is common in professional touring and fixed installation systems to filter low frequency material below 35Hz to limit sub sonic material. The SN-18LF takes advantage of this technique and has been designed to offer maximum impact low frequency output in its rated bandwidth. The SN-18LF features an aluminum rectangular geometry voice coil and very high thermal capacity to insure high power handling and high reliability. The combination of a light weight but very high energy product Neodymium magnet structure and a die cast aluminum chassis produce a very light weight design. The SN-18LF is well suited for medium format touring systems and excellent for fixed installation designs, particularly when the systems must be suspended. The light weight design makes the SN-18LF ideal for portable systems as well as for flown/suspended systems. The SN-18LF is an excellent choice for bass and sub woofer designs.

GENERAL SPECIFICATIONS

Nominal Impedance 8 Ω
Power 600 Watt (rms)
SPL 1W@1M average sensitivity 96 dB
Frequency Response 40Hz - 125Hz
Dimension Ø x H (cm) 46.0 x 21.0
Net Weight 4.5 kg (9.9 lbs)
Shipping Weight 6.5 kg (14.3 lbs)
Packing Dimension H x W x D (cm) 49.5 x 49.5 x 24.5 (2.1cu.ft)
19.5" x 19.5" x 9.6"

PHYSICAL SPECIFICATIONS

Magnet type Neodymium
Voice Coil Diameter 76.2 mm (3 inch)

THIELE/SMALL PARAMETERS

Resonance Frequency Fs 40 Hz
DC. Resistance Re 5.4 Ω
Coil Inductance Le 0.34 mH
Mechanical Q Factor Qms 7.84
Electrical Q Factor Qes 0.70
Total Q Factor Qts 0.65
BL Product BL 16.33 Tm
Effective Moving Mass Mms 139.74 g
Equivalent Cas Air-Load Vas 205.50 Liters
Effective Piston Area Sd 0.116 Sqm
Half-Space Efficiency Eff 1.80 %
Airgap Height Hag 8.0 mm
Voice Coil Height Hvc 18.0 mm
Voice Coil Overhang Xmax 5.0 mm

 datasheet