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In the Forum: Horn-Loaded Speakers
In the Thread: Deep End DIY - Australian take one Macondo.
Post Subject: The loss is related to speaker impedancePosted by anthony on: 10/3/2017
I think I am correct, but the problem is directly related to loudspeaker impedance. I did the first round of calculations by hand and when I got the results I searched the web for a calculator that someone has made so that I did not have to write it into a spreadsheet. This is the calculator I just found:
http://www.electrovoice.com/cableloss.php?
It more or less agrees with my calculations.
With higher speaker impedances there is no issue with smaller speaker wires, but as load impedance drops a fair amount of amplifier power is lost in the cable and low resistance becomes more important. So if I have 92 ft (28m) of speaker wire that meets a 1R speaker impedance I basically cannot have too little resistance.
But...
The bit that is doing my head in at the moment is whether I have modelled it correctly. I have 1m of speaker cable from the amp to the Junction Box which will see 1R representing the entire stack of Cannons. From the Junction Box I'll have 1.75m of speaker wire to each individual driver that will see 7R (not 1R as I have modelled earlier) so perhaps the wire gauge does not matter so much here. You are most likely right and I've created a storm in a teacup!
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