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Post subject: Red knob twin
Posted: Sun Feb 15, 2009 6:15 am
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I bought it new in 1992 and have never changed the factory settings. What should the ohms be set to? 4, 8 or 16?

Thanks


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Posted: Sun Feb 15, 2009 2:42 pm
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I think it depends on the speakers


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Posted: Fri Feb 20, 2009 9:14 pm
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Joined: Tue Jul 15, 2008 9:26 pm
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Hi
Look for the manual on line. Is probably there. How many speakers and what are the values on them and are they in series or parallel or a combination of both?

In series the Ohms add up to a total eg: 8 ohms x 2 = 16ohms total

Usually speakers are in parallel.
Now its tricky
8 ohms x 2 = 4ohms total.

The formula for parallel is

(please ignore the dots as i need to use them to position the formula as the spaces are stripped when i save this)

......................1.
----------------------------------------
........1..................1..............1
.....------....+.......-----....+...-------........ect ---------->
.......A..................B..............C


EG

4ohms 4 ohms 8 ohms in parallel =>

..........................1
---------------------------------------
........1................1................1
.....------....+.......-----....+...-------........ = 1.6 ohms
........4................4................8

usually it is 8 and 8 in parallel giving 4 ohms total.

You could always cheat an buy a meter at circuity and measure it but most cheap meters will have problems below 4 ohms.


Good luck
and yes I'm a retired electronics tech. and crazy musician.

Cheers K

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