Owner's Manual

Speciﬁcations

AD-S28Tw

Frequency Response

: 42 - 165 Hz (-3 dB), 36 - 205 Hz (-10 dB)

Maximum Output

: 118 dB SPL continuous rms output

(Calculated) 124 dB SPL peak output

Transducers: Dual 8 inch (200 mm) weather resistant, polypropylene cone woofer, rubber surround

Impedance (ohm): 8.0 nom. / 9.5 min at 77 Hz with LPF “IN” / 5.3 min at 63 Hz with LPF “OUT”

Power Handling

RMS (IEC 2hrs): 250 W

Recommended amp rating: 500 W

Sensitivity: 94 dB, 2.83 V, 1 m, ground plane (2P)

Internal Filter: 120 Hz low pass, passive, bypassable

Optional Processing: 120 Hz low pass >12 dB/octave, internal ﬁlter bypassed

Transformer:

Type: Custom low distortion laminated core, wide bandwidth design

Taps: 70 V: 200, 100, 50, 25 W / 100 V: 200, 100, 50 W / 8 W selected by rotary switch

Connectors: Four position screw terminals; 2 in / 2 out

Controls: Transformer tap selector and bypass; rotary switch

Low pass ﬁlter rotary switch

Enclosure Conﬁguration: Dual chamber bandpass, one chamber ported, surface mount

Enclosure Construction: Marine grade plywood

Environmental: IEC 60529 IP-x4 rated against dust and water incursion. Not recommended for outdoor

installation without adequate cover.

Finish: Textured black paint (paintable)

Grille: Zinc plated steel with black paint coating and black ABS end caps

Mounting Hardware: Included black powder coated steel yoke with attachment hardware

Included black zinc coated forged shoulder steel M6 eyebolts

Included black powder coated steel shear plates with attachment hardware

Included black rubber feet with integral threaded bolt

Weight - Net / Shipping: 43 lb (19.5 kg) / 55 lb (25 kg)

Speciﬁcation Notes:

1 - All frequency ranges speciﬁed refer to half space measured response (2P).

2 - Calculated peak SPL at 1m, half space, speaker operating at rms power, pink noise input, 50 Hz to 20 kHz.

3 - Maximum input power tested in accordance with IEC recommendations; 50 Hz to 20 kHz band limiting, 6 dB signal crest factor.

Speciﬁcations are subject to change without notice.

For detailed information, visit QSC’s web site at http://www.qscaudio.com or call us at 1-800-854-4079 (toll free USA only)