System Sensor SPSRK Outdoor Wall Speaker Strobe Red

The System Sensor SPSRK Outdoor Wall Speaker Strobe Red is a weatherproof audible/visual notification appliance from the SpectrAlert Advance family. It combines a high-fidelity emergency voice speaker with a field-selectable visual strobe in a red wall-mount assembly designed for both indoor and outdoor fire alarm applications. System Sensor specifically identifies the SPSRK as the red outdoor wall speaker strobe with standard selectable candela output.

The speaker supports 25 or 70.7 VRMS operation with selectable ¼, ½, 1, and 2 watt taps, while the strobe provides selectable 15, 15/75, 30, 75, 95, 110, and 115 candela settings. The standard SPSRK includes its plastic weatherproof backbox for outdoor installation.

Product Functions

• Provides combined emergency voice and visual notification
• Designed for outdoor and indoor fire alarm applications
• Red wall-mount housing
• FIRE-marked configuration
• Includes plastic weatherproof backbox
• Supports 25 VRMS speaker circuits
• Supports 70.7 VRMS speaker circuits
• Provides selectable ¼, ½, 1, and 2 watt speaker taps
• Provides selectable 15–115 candela visual output
• Uses a xenon strobe
• Provides 400–4,000 Hz speaker frequency response
• Supports System Sensor synchronization
• Suitable for wet environments
• Supports air-handling-space applications
• Uses rotary switches for speaker voltage and wattage selection
• Accepts 12–18 AWG field wiring
• Provides NEMA 4X performance when installed with the required weatherproof backbox
• Operates in temperatures down to −40°F / −40°C

Outdoor Speaker Strobe Operation

The SPSRK combines two life-safety notification functions in one device.

The speaker reproduces emergency voice messages, evacuation instructions, and alarm tones generated by a compatible fire alarm voice evacuation or emergency communication system.

The strobe provides visual notification for occupants who may not hear the audible message or where visible emergency signaling is otherwise required.

System Sensor specifies the outdoor speaker-strobe family for fire protective signaling systems and lists it for use in wet environments when installed with its weatherproof backbox.

Selectable Candela

The SPSRK provides seven field-selectable standard-candela settings:

• 15 cd
• 15/75 cd
• 30 cd
• 75 cd
• 95 cd
• 110 cd
• 115 cd

The appropriate candela setting should be determined from the approved fire alarm design, mounting location, required visual coverage, circuit loading, applicable codes, and authority having jurisdiction requirements.

System Sensor also publishes low-temperature candela derating information for outdoor applications. The 15 cd setting should not be used below 32°F, while higher settings have specified output ratings at temperatures down to −40°F.

Dual-Voltage Speaker

The SPSRK speaker supports either:

• 25 VRMS nominal
• 70.7 VRMS nominal

This allows the same appliance to be used on common 25-volt or 70.7-volt distributed emergency voice systems.

The selected speaker voltage must match the output of the connected fire alarm voice amplifier.

Selectable Speaker Wattage

The SPSRK provides four field-selectable speaker power taps:

• ¼ watt
• ½ watt
• 1 watt
• 2 watts

Speaker voltage and wattage are selected using rotary switches, simplifying field configuration.

The wattage setting determines both acoustic output and the load placed on the fire alarm amplifier. Higher wattage settings provide greater sound output but consume more of the available amplifier capacity.

Audible Output

System Sensor publishes the following UL reverberant sound-pressure levels at 10 feet for the outdoor speaker-strobe:

• ¼ W: 80 dBA
• ½ W: 83 dBA
• 1 W: 86 dBA
• 2 W: 89 dBA

The speaker provides a frequency range of 400–4,000 Hz, making it suitable for intelligible emergency voice messages as well as alarm tones.

Actual installed sound pressure depends on speaker placement, distance, ambient noise, room or outdoor acoustics, and other environmental conditions.

Strobe Operation

The visual section uses a xenon flash tube with an associated lens and reflector system.

The strobe can operate on either:

12 V nominal: 8–17.5 V
24 V nominal: 16–33 V

At 12-volt operation, available output is limited to 15 and 15/75 candela. The full standard-candela range is available on appropriate 24-volt circuits.

The strobe flashes at approximately 1 Hz, or one flash per second, throughout its rated operating voltage range.

System Sensor Synchronization

The SPSRK supports System Sensor synchronization when connected to compatible fire alarm control equipment, power supplies, or synchronization modules.

Synchronization allows compatible strobes within the same field of view to flash together according to the system design.

This is especially important in installations containing multiple visible notification appliances.

Weatherproof Design

The K suffix identifies the SPSRK as an outdoor model.

System Sensor specifies an operating temperature range of:

−40°F to 150.8°F / approximately −40°C to 66°C

The speaker strobe is suitable for:

• Outdoor environments
• Wet locations
• Indoor applications
• Air-handling spaces
• Areas exposed to significant temperature variation

The appliance must be installed with its approved weatherproof backbox to retain its outdoor approval.

Weatherproof Backbox

The standard SPSRK includes a red plastic weatherproof backbox.

System Sensor distinguishes several related versions:

• SPSRK – Red outdoor speaker strobe, standard candela, weatherproof backbox included
• SPSRK-P – Red outdoor speaker strobe, plain/no FIRE marking, backbox included
• SPSRK-R – Replacement red outdoor speaker strobe without weatherproof backbox

System Sensor notes that when replacing standard outdoor units, both the device and backbox should be replaced unless the appropriate replacement configuration is specifically being used.

Electrical Specifications

Speaker Input: 25 or 70.7 VRMS
Speaker Taps: ¼ / ½ / 1 / 2 W
Speaker Frequency Range: 400–4,000 Hz
Strobe Voltage: 12 or 24 VDC/FWR
12 V Operating Range: 8–17.5 V
24 V Operating Range: 16–33 V
Strobe Flash Rate: 1 Hz
Candela Settings: 15 / 15/75 / 30 / 75 / 95 / 110 / 115 cd
Field Wiring: 12–18 AWG

Maximum strobe current at 24 VDC varies by candela setting, from approximately 66 mA at 15 cd to 210 mA at 115 cd. System designers should use the manufacturer’s applicable current table when calculating NAC capacity and voltage drop.

Physical Specifications

Color: Red
Marking: FIRE
Mounting: Wall
Environment: Indoor / Outdoor
Speaker-Strobe Dimensions: Approximately 6.0 × 5.0 × 4.9 in, including lens and speaker
Weatherproof Backbox: Included

The wall-mount weatherproof backbox measures approximately 6.5 × 5.5 × 2.9 inches.

Environmental Specifications

Operating Temperature: −40°F to approximately 151°F / −40°C to 66°C
Environment: Indoor / Outdoor
Wet Location Use: Yes
Air-Handling Space Use: Yes
Weatherproof Rating: NEMA 4X when installed with the required backbox

Installation Information

Typical SPSRK installation includes:

• Installing the supplied weatherproof backbox
• Routing speaker and strobe circuit wiring
• Connecting the speaker circuit to the compatible voice amplifier
• Selecting 25 or 70.7 VRMS speaker operation
• Selecting the required ¼–2 watt speaker tap
• Connecting the visual notification circuit
• Maintaining correct strobe polarity
• Selecting the required candela
• Securing the appliance to the weatherproof mounting assembly
• Verifying System Sensor synchronization where required
• Testing emergency voice reproduction
• Testing strobe activation
• Confirming outdoor weatherproof integrity

The approved weatherproof backbox is required for the appliance to retain its outdoor listing.

Testing & Maintenance

Testing should confirm:

• Proper speaker activation
• Clear emergency voice reproduction
• Correct 25 or 70.7 V speaker setting
• Correct ¼, ½, 1, or 2 watt tap
• Proper strobe activation
• Correct selected candela
• Proper strobe synchronization
• Correct circuit polarity
• Adequate speaker and strobe operating voltage
• Secure field wiring
• Secure weatherproof backbox
• No moisture intrusion
• No corrosion or physical damage
• Clear FIRE identification
• Proper system restoration following testing

Outdoor installations should also be periodically inspected for deterioration of seals, conduit entries, backbox components, mounting hardware, and other parts exposed to weather.

Product Identification

• Manufacturer: System Sensor / Honeywell
• Model: SPSRK
• Series: SpectrAlert Advance
• Product Type: Outdoor Wall Speaker Strobe
• Primary Function: Emergency Voice & Visual Notification
• Housing Color: Red
• Marking: FIRE
• Mounting: Wall
• Speaker Voltage: 25 / 70.7 VRMS
• Speaker Taps: ¼ / ½ / 1 / 2 W
• Frequency Range: 400–4,000 Hz
• Maximum UL Reverberant Output: 89 dBA at 10 ft at 2 W
• Strobe Technology: Xenon
• Candela: 15 / 15/75 / 30 / 75 / 95 / 110 / 115 cd
• Strobe Voltage: 12 / 24 VDC or FWR
• Flash Rate: 1 Hz
• Wire Gauge: 12–18 AWG
• Operating Temperature: −40°F to approximately 151°F
• Weatherproof Backbox: Included
• Weather Rating: NEMA 4X
• Environment: Indoor / Outdoor / Wet Locations
• UL/ULC Listing: S4048
• FM Approval: 3030863 for speaker/speaker-strobe family

Protection & Applications

Suitable for:

• Outdoor Fire Alarm Notification
• Emergency Voice Evacuation Systems
• Audible and Visual Notification
• 25-Volt Speaker Systems
• 70.7-Volt Speaker Systems
• Wet-Location Fire Alarm Systems
• Weather-Exposed Areas
• Parking Garages
• Parking Structures
• Loading Docks
• Exterior Building Areas
• Industrial Facilities
• Manufacturing Facilities
• Warehouses
• Mechanical Areas
• Schools and Universities
• Hospitals and Healthcare Facilities
• Hotels
• Government Buildings
• High-Rise Buildings
• Commercial Life-Safety Systems

The System Sensor SPSRK Outdoor Wall Speaker Strobe Red is particularly useful where a weatherproof red FIRE-marked appliance must provide both intelligible emergency voice communication and selectable visual notification. Its dual-voltage 25/70.7 V speaker, ¼–2 watt taps, 15–115 cd strobe, wide environmental range, and included weatherproof backbox make it suitable for demanding outdoor voice evacuation applications.

Download the Specification sheet in *.pdf format