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fredbloggstwo fredbloggstwo is offline
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Default Attenuate -10db output


wrote in message
...
I'm looking for a low cost way to slightly attenuate a -10db stereo
RCA output from an FM tuner.

This is a small cable studio's playout system. There is no mixer:
Several devices (4 streams from a video server, several tape and DVD
decks) feed into a routing switcher, then a compressor/limiter, then
into modulators and out into the cable system. It is important to have
all devices at the same approximate level; While they are all -10db,
the only significant difference is the tuner. It is noticeably louder
than all the other sources. The tuner is a Rolls RS80, and it has no
adjustment for output level (except the front-panel headphone jack,
which I am currently using. The protruding cable looks bad, and I want
to use the rear stereo RCA jacks.

I could use a cheap Behringer mini-mixer, but I'd rather find one of
those little "audio solutions" boxes that will give me control of the
level, definitely down, but perhaps up also. Any ideas?


If you know the approximate input impedance of the device you are connecting
to, you can use a single series resistor to pot it down. For example, if
the input impedance is 10k (this is the effective resistance in the input to
ground) a series resistance of 10K will attenuate the signal to one half, or
6dB. A resistor of 20K will attenuate it to one third - about 9.5 dB. In
this case I would use a 22K resistor to get about 10dB.

Cheers

Mike