I don't know. I get the same answer. What's the input impedance of the
device it's padding, though? If it's a regular guitar amp, you'd think
the input impedance would be high enough to not matter. Or what if the
output impedance of the Elextrix Repeater is low enough to cause an
additional loss of 3.1 dB with this 8.9 dB attenuator? If my math is
correct, a 700 ohm output impedance would do the trick....very close to
your traditional 600 ohm output impedance for devices back in the day.

Cheers,
Trevor de Clercq

apa wrote:
I was looking though the manual for an Elextrix Repeater and toward the
end it has a diagram for building a 12dB attenuation cable for plugging
it into a guitar amp. It's three resistors arranged like this:


tip-------------3.9k----------tip
| |
2.2k 2.2k
| |
sleeve------------------------sleeve


From my math, this gives about -8.9dB, not -12dB.
My math's not very good though. Could someone just confirm that I'm
wrong so I can go back and look for my mistake(s)?

Thanks