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Appendix C: TH-18s Specifications
Construction Features
Basic Design: Trapezoidal
Material: Void-free plywood
Finish: Textured black catalyzed
polyurethane paint
Handles: One on each side
Grille: Perforated metal
Physical Properties
Height: 24.1 in / 612 mm
Front Width: 20.2 in / 513 mm
Rear Width: 15.1 in / 383 mm
Depth: 25.3 in / 643 mm
Weight: 73 lb / 33.1 kg
Mounting Method:
The TH-18s subwoofer is designed to sit on the floor or stage.
It is NOT designed to be pole-mounted or suspended. The
cabinet has no rigging points and is not suitable for rigging.
Never attempt to suspend the TH-18s by its handles.
LOUD Technologies Inc. is always striving to improve our products
by incorporating new and improved materials, components, and
manufacturing methods. Therefore, we reserve the right to change
these specifications at any time without notice.
“Mackie,” and the “Running Man” are registered trademarks of LOUD
Technologies Inc. All other brand names mentioned are trademarks
or registered trademarks of their respective holders, and are hereby
acknowledged.
©2010 LOUD Technologies Inc. All Rights Reserved.
Acoustic Performance
Frequency Range (–10 dB): 35 Hz – 150 Hz
Frequency Response (–3 dB): 50 Hz – 115 Hz
Max peak SPL (calculated)
1
: 129 dB
Max peak SPL (measured)
2
: 124 dB
Transducer
Diameter: 18 in / 457 mm
Voice coil diameter: 3 in / 76 mm
Diaphragm material: Paper
Magnet material: Ferrite
Power Amplier
Rated Power: 500 watts rms
1000 watts peak
THD: <0.1%
Design: Class D
Cooling: Convection
Input/Output
Input Type: Female XLR Balanced
differential (stereo
left/right)
Input Impedance: 20 k
balanced
Full Range Output: Male XLR Balanced
(parallel with input)
High Pass Output: Male XLR Balanced
Level Control: –6 dB to +6 dB
Electronic Crossover
Crossover Type: 24 dB/oct.
Linkwitz- Riley
Crossover Frequency: 125 Hz
Protection Features
Over-excursion Protection: 40 Hz 24 dB/oct.
Butterworth High
Pass Filter
Thermal Protection: Amplifier mute, auto
reset
Driver Protection: Peak/RMS Limiter
Display LEDs: Thermal, OL, Signal,
Power
AC Power Requirements
US: 100-120 VAC, 50-60 Hz
Fuse: T 6.3A H 250V
Europe: 220-240 VAC, 50-60 Hz
Fuse: T 3.15A H 250V
Power Consumption: 160 watts @ 1/4 power
AC Connector: 3-pin IEC 250 VAC,
15 A male
1 Calculated from peak driver sensitivity and amplifier power, half space.
2 Measured with swept sine at 1 W within operating range, scaled for max power, half space.
TH-18s
24.1 in /
612 mm
25.3 in /
643 mm
20.2 in / 513 mm
W E I G H T
73 lb
33.1 kg
15.1 in /
383 mm