In this video, we'll be exploring one of the more interesting details about mechanical horns, which is the fact that many were available in both low- and high-decibel versions. I believe this is typically determined by the resistance of the electromagnetic coil.

Featured in this video are my Simplex 2901-9838 and 2901-9846 with 4903-9101 strobe plates, two Federal Signal Vibratone 450's with VALS strobes, and two Simplex 4051's.

Table of Contents:
0:00 - Intro & Overview
0:24 - Simplex 2901-9838 & 9846
0:52 - Testing the -9838
1:11 - Testing the -9846
1:34 - Federal Vibratone 450D + VALS
1:52 - Testing the 35 mA 450
2:07 - Testing the 63 mA 450
2:23 - Simplex 4051's
2:55 - Testing the 100 mA 4051 (5640)
3:09 - Testing the 200 mA 4051 (5540)
3:27 - Conclusion

Additional Notes:
- Bells were also available in multiple power levels, like the Faraday 4160 (70 mA) and 4060 (110 mA)
- A few other examples, including the Edwards 895B-001 (60 mA) and -201 (160 mA), the Simplex 2901-9833 (35 mA) and 2901-9818 (60 mA)
- I have not found an example of an AC-powered horn with low/high output versions

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