I have never seen electrical calculations for sensors use dB instead of actual volts or amps for wiring loss calculations, although it is nice to be able to add losses instead of multiplying loss ratios.I meant dB loss wiring calculator in reference to f/a wiring.
True, since there may be regulation in the transducer or a minimum operating voltage.I think even if you did convert the voltage drop of the wiring into db it wouldn't correlate directly into a SPL difference.
-Hal
Agree... but in general, output SPL correlates directly with input change in dB.True, since there may be regulation in the transducer or a minimum operating voltage.
And what I'm saying is you can.Right. But what I'm saying is that you can't just subtract the db loss of the wiring from the designed SPL (in db) of the speaker. I think this is what the OP is wanting to do in order to determine the reduction in SPL due to wire length/resistance. It's really going to be negligible anyway if you size the wire properly and the amp sized to have enough reserve capacity to be able to be "turned up" to compensate.
-Hal
And what I'm saying is you can.
A -3dB change in voltage from source to load will correlate to a 3dB loss in output SPL. But I emphasize again, this is a generalization.
Not an area I'm well versed in, so I never rely on one source. As such, I'm getting some conflicting info.Mmmm, no. Horns or speakers are listed to constant output within their operating range, typically 16 - 33 VDC for horns. If the horn is set for 90 db, you'll get 90 db over the entire operating voltage range. Current draw will vary, but all the figures they give you for current draw assume the lowest allowable voltage, hence "max current draw".
SOURCE: http://www.cooperfire.com/sites/default/files/product/tech-docs/CFS0077-UL-C-WEB_Part15.pdf* UL max current rating is the maximum RMS current within the listed voltage range (16-33V dc for 24V dc units). For strobes the UL max current is usually at the minimum listed voltage (16V dc for 24V dc units). For audibles the max current is usually at the maximum listed voltage (33V dc for 24V dc units). For unfiltered ratings, see installation instructions.
Not an area I'm well versed in, so I never rely on one source. As such, I'm getting some conflicting info.
From a Cooper Horn Strobes document:
SOURCE: http://www.cooperfire.com/sites/default/files/product/tech-docs/CFS0077-UL-C-WEB_Part15.pdf