Wheelock STH-2 MSR Installation Instructions Download Page 2

P83966 C 

Sheet 2 of 4 

WARNING:  WHEELOCK STRONGLY RECOMMENDS THAT THE VOLTAGE APPLIED TO THESE PRODUCTS 

BE WITHIN THEIR RATED INPUT VOLTAGE RANGE.  THE APPLICATION OF IMPROPER VOLTAGE MAY 
RESULT IN DEGRADED OPERATION OR DAMAGE TO THESE PRODUCTS, WHICH COULD RESULT IN 
PROPERTY DAMAGE AND SERIOUS INJURY OR DEATH TO YOU AND/OR OTHERS. 

 

NOTES: 

1. 

Power Handling Capacity (RMS):  15W 

2. 

Sound Dispersion:  70 Degrees 

3. 

Constant Voltage Line:  25Vrms or 70Vrms 

4. 

Frequency Response:  UL rated at 400 - 4,000Hz (@ Full Rated Output), Anechoic 400 – 14,000 Hz. 

5. 

Sound Level (Peak):  120dB @ 15W, 1 Meter 

6. 

Dimensions:  7-7/8W X 8-3/4H X 9-5/16L 

 

CAUTION: 

 Do not place switch in settings marked "not used".  Failure to comply with these restrictions may cause damage to 

components and will void the warranty. 
 

STROBE

 

Table 2A:  Rating Per UL 

Model 

Code 

Lens 

Color 

Rated 

Voltage 

Input 

Current 

Flash 

Rate 

Typ. Eff. 

Candela 

DC-MAX-C 

Clear 

10.5 to 31.0 VDC 

See Table 2b 

60/Min Typical 

100cd 

 

Table 2B:  DC-MAX-C Input Current Versus Input Voltage 

Voltage (VDC) 

12 

24 

Current (mA) 

1010 

470 

 

NOTES

1. 

Temperature range for all models is -30

°

F to +150

°

F (-35

°

C to +66

°

C) 

2. 

Flash energy and flash rate are specified for double flash operation. 

3. 

Effective candela is measured per IES specifications. 

 

INSTALLATION INSTRUCTIONS: 
 
SPEAKER WATTAGE SELECTOR SWITCH SETTING: 

1. 

Remove the cable entrance interface adaptor and gasket. (See Installation Sheet P82697) 

2. 

Adjust the Speaker Wattage Selector Switch for the desired dB and wattage setting (Table 1) for each speaker. 

3. 

Replace the cable entrance interface adaptor and gasket. 

 

APPLICATION NOTES: 

1. 

Loosen the 4 Phillips screws holding the cover plate and MAX-DC-C Strobe to the enclosure box. (Figure 1) 

2. 

Remove the cover plate and MAX-DC-C Strobe. 

 

Figure 1:  Phillips Screw Location 

 

COVER PLATE AND STROBE

PHILLIPS SCREWS-4X

 

 

3. 

Mount the speaker assembly to the desired location. 

4. 

Punch out desired knockouts and attach conduit and fittings. 

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