List of sirens built by Alerting Communicators of America

This article lists the outdoor warning sirens built by Biersach & Niedermeyer Co., Alerting Communicators of America and American Signal Corporation.

Biersach & Niedermeyer Co.
Name Type Motor HP Port Ratios Years of Production Sound Output and Type Notes
Mobil Directo (Gas Powered) Gas-Mechanical 25 8 1942–1952 Rotating 125 dB at 100 ft. The first version of the Mobil Directo which used a 25HP Wisconsin air-cooled engine.
Mobil Directo Electro-Mechanical 10 10/12 1952–1964 Rotating 124 dB at 100 ft. The second version of the Mobil Directo which used a 10HP electric motor.

Alerting Communicators of America sirens
Name Type Motor HP Port Ratios Years of Production Sound Output Type Notes
Allertor 125 Electro-Mechanical 10 (some 15) 8, 8/12, 9/12, 10/12 1967–1984 Rotating 125 dB at 100 ft. Design changed at least three times throughout production. The most common port ratio is 9/12. The Allertor 125 can produce 2 tones. Alert and Attack (Wail). A third signal was also available, Yelp, which required a special type of motor and used a reversing magnetic starter.
Cyclone 120 Electro-Mechanical 40 8/12 1967–1981 Omni Directional 120 dB at 100 ft. Produces 120 dB at 100 feet. Produces the 3 following tones: Alert, Attack (Wail) and Pulse (Coded damper needed for pulse signal).
Cyclone 125 Electro-Mechanical 50 8/12 1981–1992 Omni Directional 125 dB at 100 ft. Produces 125 dB at 100 feet. Produces the following 3 tones: Alert, Attack (Wail) and Pulse (Coded damper needed for pulse signal).
Howler Electro-Mechanical 10 9/12 1972–1989 Rotating 123 dB at 100 ft. The Howler is a rotational version of the Screamer S-10 (very rare).
Hurricane 130 Electro-Mechanical (horn and blower) 2 (chopper) 25/30 (blower) 8/8, 8/10, 10/10, 10/12, 12/12 1967-1973 (square horn) 1973-1981 (round horn) Rotating 130 dB at 100 ft. Started off using a 25HP blower with a square horn, redesigned to 30 HP with round horn. Most common port ratio is 8/10. This siren is similar to Federal Signal's Thunderbolt series.
Screamers Electro-Mechanical 2, 5, 7.5, 10 8, 9, 9/12 1967–1990 Omni Directional 105–115 dB at 100 ft. Series of small vertical sirens, comparable to Federal Signal Corporation's Vertical sirens from the 1930s.
Sentry 95 Electro-Mechanical 1 5/6 Unknown Omni Directional 95 dB at 100 ft. Very uncommon siren. Dual tone circular port siren. 95 dB at 100 ft. Manufactured by Klaxon, sold in USA under ACA name.
Super Banshee Electro-Mechanical 25 8/12 1967–1982 Omni Directional 119 dB at 100 ft. The Super Banshee can produce a Hi-Lo signal with dampers and the other standard tones like Alert and Attack.
Banshee Electro-Mechanical 10 (Banshee 110), 15 (Banshee 115). 8 and 9/12 and supposedly 10/12 (for the 110). 1967–1973 (Banshee 110) 1973–1994 (Banshee 115) Omni Directional 110–115 dB at 100 ft. There are two models of the common Banshees, the Banshee 110 (9/12 only) which can do pulse unlike the 115, and the Banshee 115 which comes in 8 and 9/12 port ratios and only does standard signals (Attack and Alert).
Penetrators Electro-Mechanical 10, 15, 50 8, 9/12 (P-10 and 15) 8/12 (P-50) 1982–1990 (Later continued as the RM series) Rotating 124–135 dB at 100 ft. 10 and 15 HP models nearly the same, aside from motor used. The P-50 was and still is the loudest dual tone siren in the world. The P-15 (Single-tone) and P-50 was still being produced by ASC until 2002 and 2007.
Alertronic AL-1000–8000 Electronic none none 1983–2007 Omni Directional dB rating depends on how many drivers. First mass-produced, non-rotating electronic design by ACA.
Alertronic 5000 Electronic none none 1983–1984 Rotating 125 dB at 100 ft. Very short lived siren, replaced by the AL-6000R. Currently no videos known to exist and only a couple of photos of this model of siren.
Alertronic RE-1600 Electronic none none 1991–1995 Rotating dB rating depends on how many drivers. Was made alongside the later years of the AL-6000R.
Alertronic AL-6000R Electronic none none 1984–1995 Rotating dB rating depends on how many drivers. Replacement for the 5000.
Quadren Electronic none none 1992–1995 Omni Directional dB rating depends on how many drivers. One of the last electronic sirens made by ACA before their bankruptcy. Design was later bought by ASC, and later became the iForce.
Performance Plus Series Electro-Mechanical 7.5, 10 8 and 9 1989–1993 Rotating/Omni Directional 115–125 dB at 100 ft. Rotational versions are the PP-15 and PPN20. There is only one Omni Directional Performance Plus which is the PP Banshee 115 (Single Tone). All three models use an AC battery back up on a DC motor.
PN20 Electro-Mechanical 20 9 1992–1995 Rotating 127 dB at 100 ft. ACA's last known rotating siren. More commonly known as the RM-130.

American Signal Corporation sirens
Name Type Motor HP Port Ratios Years of Production Sound Output Type Notes
OM-117 Electro-Mechanical 15 8 1994–2004 Omni Directional 117 dB at 100 ft. Rebranded version of ACA's Banshee siren, only in the 15 HP version.
OM-120 Electro-Mechanical 20 8 1998–2004 Omni Directional 120 dB at 100 ft. Similar to the earlier ACA Banshee, but used a 9 port chopper and stator with slightly different housing and also came with battery back up.
RM-127 Electro-Mechanical 15 8 1995–2002 Rotating 127 dB at 100 ft. The same as the single tone Penetrator-15.
RM-130 Electro-Mechanical 20 8 1995–2002 Rotating 127 dB at 100 ft. The same as the earlier PN20.
C-125 AC Electro-Mechanical 50 8/12 1995–2006 Omni Directional 125 dB at 100 ft. The same as the Cyclone 125.
AL Series Electronic none none 1995–Present Omni Directional dB rating depends on how many drivers. Similar to the Alertronic 4000, but now in different sizes. (AL Line is not shown on ASC's webpage)
AL-4000R Electronic none none 1995 Rotating 124 dB at 100 ft. A modernized version of the ACA AL-6000R and RE-1600.
Tempest (Rotating) Electro-Mechanical Comes in 7.5, 20, and 50 HP 8 (8/12 for T-135 AC) 1998–Present Rotating 128–135 dB at 100 ft. Three sirens in this line up: T-128, T-135 AC, and T-135 AC/DC

The T-135 AC was known as ACA P-50, the name was changed after ACA's bankruptcy. The T-135 AC/DC is a siren that is bigger and more powerful than the T-128 and has a similar design and also has a battery backup system. This was introduced around 2007, replacing the T-135 AC.

Tempest (Omni Directional) Electro-Mechanical 7.5 8 1998–Present Omni-Directional 112–121 dB at 100 ft. Two sirens in this line up: T-112 and the T-121

The T-121 is an 8 port siren that has a similar design to Federal Signal's Eclipse 8. The T-112 is a hornless version of the T-121.

Quadren Electronic none none 1995–1998 Omni Directional dB rating depends on how many drivers. Renamed the iForce after being redesigned in the early 2000s.
iForce Electronic none none 2002–Present Omni Directional dB rating depends on how many drivers. The iForce is an electronic siren made by ASC that comes in many different sizes (Sound Cells) and only comes in single tone. Similar to Federal Signal's Modulator.
E-Class Electronic none none 2002–Present Omni Directional dB rating depends on how many drivers. Speakers can be arranged in whichever pattern is needed. Very similar to ATI's omni-directional sirens.
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