Toa BS-20 Specifications

SPLASHPROOF SPEAKER SYSTEM BS-20W DESCRIPTION The TOA BS-20W is a splashproof type speaker system designed especially for railway station platform applications. It incorporates a 13 cm (5.2") woofer and a piezo driver unit with constant directivity horn, ensuring a uniform (30° horizontal by 90° vertical) sound dispersion pattern. The BS-20W has a splashproof ABS resin enclosure and a painted finish to protect against ultraviolet rays. In addition, its speaker unit is waterproofed. Applications include high humidity/temperature areas, as well as outdoors or under eaves where the speaker is likely to be exposed to rain. FEATURES 1. Sealed type enclosure. 2. One 13 cm (5.2") diameter splashproof cone speaker 3. Constant directivity horn plus splashproof piezo driver unit (90° x 30°). 4. 20W rated power input and 94dB/w/m output sound pressure level. 5. 100 Hz to 20 kHz frequency response. 6. Rotaly switch impedance changing (20W, 15W, 10W, 5W on 100V) 7. Zinc-coated steel plate black-painted punching net/mounting bracket 8. Stainless steel angle bolts.

Frequency One 13 cm (5.2”) dia. splashproof cone speaker Speaker for High Frequency CD horn (30° horizontal by 90° vertical) plus splashproof piezo driver unit Rated Power Input 20W Nominal Impedance 500 ohms (20W), 670 ohms (15W), 1k ohms (10W) and 2k ohms (5W) Output Sound Pressure Level 94dB/W/m Frequency Response 100 Hz~ 20 kHz Ambient Temperature Material & Finish -20~+55°C (-4~+122°F) Enclosure: ABS resin, black paint Punching net/Mounting brancket: Zinc-coated steel plate, black paint Bracket bolts: Stainless steel Dimensions 342 (W) x 200 (H) x 175 (D) mm 13.5 (W) x 7.9(H) x 7.9 (D) inches Weight 3.6 kg (8.0 Ibs) *Specificatlons are subject to change without notice. APPEARANCE AND DIMENSIONAL DIAGRAM Changing the Wattage (Impedance) j Remove the waterproof cap at the side where the woofer is attached. k Select the desired impedance (wattage) by rotating the rotary switch with a flat head screwdriver. l After setting the impedance, be sure to replace the cap as it keeps the speaker splashproof. (Any change in impedance maintains the siren sound pressure level at 90dB/m or better.) Impedance 2k ohms 1k ohms 670 ohms 500 ohms Wattage 5W 10W 15W 20W *The BS-20W is factory-wired to 20W (500 ohms). (100V line) *Polarities: black (HOT), white (COLD). CHARACTERISTIC DIAGRAMS Frequency Response (Anechoic chamber, 1W/1m, 1/3 octave pink noise) Polar Response horizontal vertical