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Head phones?

machineman said:
Why 150 ohms? I dont understand why all the detecting headphones are 150? The stock speaker is 16 ohms.
not all HP are 150 ohms,,, just the better ones,,,, what it means to us is you will hear the softtest/weakest signals thru the speakers,,,, lower ohm speakers need more/louder/larger targets to produce an audible response
 
Thanks Grouser, thats the kind of answer I was looking for. I made my set with a 8 ohm speaker. I have a higher ohm one on order.
 
machineman,

Looking through my computer Documents files I found several replies that I had saved from Rudy when the Headphones Clinic was running at Friendly Metal Detecting. See the fourth paragraph down in one of his replies that I uploaded, starting with "For maximum efficiency".

I picked out a few more paragraphs of information that I thought might interest you from some of his other replies and rather than upload the full replies, I just retyped those particular paragraphs below (colored for identification).

I asked Rudy why so many of the headphones are 150 Ohms and he replied as follows: " the higher impedance they use makes their design work well across a large cross section of detectors. The main thing is to not buy a low impedance headphone. Once you are past the 60 Ohm range, going higher is not necessary, but it doesn't hurt."

Ohms is the unit-of-measure for impedance. Impedance is a way to describe how difficult it is for a current to flow in a circuit. In other words it "impedes" the flow of the current. The larger the impedance, the more difficult it is for the current to flow.


Hope this helps !

ToddB64
 
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