160Ω resistor included with speaker

[JM2]

Just wondering as I've not come across this before.

Also included with my replacement speaker unit was a 160Ω resistor at the 3-terminal choc block on the speaker wires.

Why? Who uses a 160Ω resistor with their 16Ω speaker (in an alarm environment) ?


The external speaker (16Ω) is a familar white plastic boxed affair to replace a remote one I'd fitted (an old PC speaker that I thought was robust enough - it lasted a few years). It was just a matter of tidy wiring and different mounting holes and was quickly fitted.

 

[bernardgreen]

Could it be an "End Of Line" resistor that enables the control panel to test that the cable has not been cut.

 

[JM2]

Sure, but 160Ω ?
I've not used EOL's anything like that value (even measured the resistor to be sure - 159.8Ω on my meter).

 

[sparkymarka]

Does it give you a lower volume by using the 160ohm ?

 

[JM2]

Well yes, but by a large margin (1/11th) of the available drive voltage.
I wonder if they'd intended 16Ω (that would be a nice half level).

Anyway, seems as random as I thought. An interesting non-standard (well it is a 5% range) so I'd better file it separate from my bulk resistors.