Hamilton HAMILTON AM1000, Installation Manual

Connections for 
balanced audio 
in. These con-
nections should 
be the same for 
other audio pro-
cessors. 
 
From the audio 
source, if the 
connector is an 
XLR connector 
you would use 
pins 2&3. Pin 1 
is ground, don’t 
use that. If the 
connector for 
the balanced 
audio to the 222 
is a 1/4” stereo 
jack use the tip 
and ring con-
nections, again 
don’t use the 
ground (sleeve). 

The goal here is to get the proper level to the input of the 222 and to the transmitter.

 
Input: Connect your audio source as explained. You should be able to see some indication 
on the Peak limit and Pre - emphasis LED indicators as you adjust the input gain. Be sure 
they are on. If you cannot get any indication with the input gain all the way up then remove 
the cover (with the 222 unplugged) and set the (input range select) to the low position 
(marked L on the board). You should be able to get an indication now, if not check to see if 
you have an input signal.

Once you have the audio material showing on the indicators, then try to connect the trans-
mitter. Depending on where the audio gain is on the transmitter unit you may or may not be 
able to get good sound at this point. If you cannot get good sound in the entire range of the 
222 output level control then check the transmitter audio gain, it should be 1/2 to fully 
clockwise, it is preferable not to have it lower then 1/2 way. If you are way over driven try 
turning the transmitter audio gain down a bit, you may need to turn it down to almost off if 
you are getting to much drive from the 222. Adjust 222 output level and Transmitter level 
for good sound from a test radio. Be careful about having a radio to close to the transmit-
ter, it can be overloaded. Try to get the audio level as high as you can.

 
If you have a unbalanced input signal to the 222 (hot and ground, single wire with shield) 
then connect the ground or shield of the input signal cable the the ground input, the (+) 222 
input terminal goes to your center conductor. Connect the (-) input terminal to the ground.  
 
Don't solve the gain problem by just turning down the input control, you will get good 
sound but the 222 will not operate properly. You should be able to see the lights come on 
as the music peaks if you have the limit and/or pre emphasis controls on.  
 
Balanced audio is two twisted wires, the signal exists as a difference voltage between the 
two wires. There is no ground. If there is a ground, it is there just for shielding. 

9 

Working 
with the 
Inovonics 
222 audio 
processor 

This type of equipment should 
have a balanced in/out connec-
tion, you will not need the audio 
AM1000pr adapter.