M Series Alarm Horn Sounders

July 2, 2021

The next generation of the M range industrial alarm horn sounders includes the MA1F, the MA2F, the MA1R, and the MA2H. The alarm horn sounders feature enhanced electronics containing the latest in D Class amplifier technology, with lower in-rush current, wider voltage range, lower current consumption, and improved alarm tone choice and control.


The MA1F uses a standard directional flare horn; the MA1R features the innovative E2S ‘1R’ omni-directional horn that is suitable for applications requiring a compact device. For higher sound output requirements, the MA2H uses the E2S ‘2H’ super high output flare horn, which is engineered to maximize audible signaling performance across the widest range of frequencies at a sound level of up to 130dB(A).


The alarm horn sounder DC voltage range is now extended from 10 to 60VDC, and the AC versions have a universal power supply accepting inputs from 100 to 240VAC. Higher voltage DC versions are available on request. The MA1 versions are factory set to low current consumption of only 224mA at 24VDC with a sound output of 117dB(A). The MA2 versions feature two user-selectable power modes that provide the optimum combinations of current consumption and sound output: 391mA and 126dB(A) to 888mA and 130dB(A).


A total of four remotely selectable alarm stages/channels are standard and can be activated by a variety of methods. A set of 64 alarm tone frequencies can be independently set as either first or second stage. Pluggable, duplicated cable terminals simplify installation. Combined audible/visual units also benefit from the next generation sounder electronics—the MC1X05 with Xenon strobe beacon and MC1LD2 with high output LED.


All units feature robust, thermoplastic fire-retardant enclosures with 316 (A4) stainless steel mounting brackets—ideal for applications in harsh environments where Type 4/4X/13/3R IP66/67 protection is required.


@ 1 m +/- 3dBHigh:
123dB(A) @ 1 m +/- 3dB
120dB(A) @ 1 m +/- 3dB114dB(A)
@ 1 m +/- 3dBDefault:
129dB(A) @ 1 m +/- 3dB
126dB(A) @ 1 m +/- 3dBNominal
@ 1m +/- 3dBHigh:
120dB(A) @ 1m +/- 3dB
117dB(A) @ 1m +/- 3dB111dB(A)
@ 1m +/- 3dBDefault:
125dB(A) @ 1m +/- 3dB
123dB(A) @ 1m +/- 3dBNo. of Tones:64 (UKOOA / PFEER compliant)No. of Stages:4Volume
Control:Full range controlEffective
Range:502 ft @ 1KHzHigh:
1,050 ft @ 1KHz
702 ft @ 1KHz355 ft @ 1KHzHigh:
1,384ft @ 1KHz
2,047ft @ 1KHzVoltages DC:10-60VDCVoltages AC:100-240V ac 50/60HzInrush:815mA within 4.0ms @ 24VDCStage
Switching:Negative, positive, voltage-freeIngress
Protection:IP66 & IP67 Type 4/4X/13Enclosure
Material:High impact UL94 V0 & 5VA FR ABSEnclosure
Color:Grey (RAL7038) or Red (RAL3000)Cable
Entries:2 x M20; 1 x M20 & 1 × 1/2-in. NPT; 2 × 1/2-in. NPTTerminals:0.5 to 2.5 mm² (20-14 AWG)


Diode polarized for use in supervised circuitsOperating
Temp:-40° to +151°FStorage
Temp:-40° to +158°FRelative
Humidity:95% at 68°FMTBF DC:93.92 years / 822,706 hours – MIL 217MTBF AC:46.66 years / 408,508 hours – MIL 217Weight DC:5.5 Ib.6.0 Ib.5.5 Ib.6.6 Ib.Weight AC:6.6 Ib.7.2 Ib.6.6 Ib.7.7 Ib.