Manual-5
MIC INPUTS
The rear panel, three-position Mic/Line switches set the mic
input gain such that the maximum signal permitted almost clips
the A/D converter. This is true for each switch position. The Mic
Inputs are automatically mixed using a gain-sharing algorithm.
Set the inputs using the black knobs so they do not (or rarely)
clip. Then, sit back and relax. If you’ve already set up the inputs
and someone starts talking louder/closer than you expected, feel
free to turn them down a little.
The green Signal indicators should easily light for soft talk-
ers even at relatively low Level settings. The Overload indicator
should light only occasionally for only the loudest talkers.
Since these Mic Inputs and their underlying gain-sharing au-
tomix algorithm are designed and optimized for speech signals,
do not use these Inputs with non-speech audio signals such as
those from musical instruments or CD/DVD players.
MAIN OUTPUT
The Main Output of an AM2 delivers the gain-sharing automix
of it’s Mic Inputs and all upstream inputs. The gray OUTPUT
LEVEL control knob always adjusts the level of the Main Out-
put. Remember, if mulitple AM2s are daisy-chained together
(using CASCADE IN / OUT ports), the automatic mix of all
microphones in the system is present at the Main Output of the
last AM2 in the daisy-chain.
CASCADE IN PORT
The Cascade Input allows more mics to be added to the gain-
sharing mic mix algorithm of the AM2’s eight Mic Inputs.
When a shielded Ethernet patch cable fed from another AM2’s
CASCADE OUT port is connected to the next AM2’s CAS-
CADE IN port, all cascaded AM2 microphones are automati-
cally added to the automatic Mic Mix of the last AM2 in the
chain. (US Patent Pending.)
Cascade audio is 24-bit, 48 kHz, fixed-point for the curious
audio nerd.
When all four Cascade Status indicators light, this means
the cable is wired properly. If any of the Status indicators are
flashing, the cable is not wired properly or damaged. In this case,
perhaps an Ethernet crossover cable was accidentally connected,
or the cable crimp has an error.
We recommend using shielded twisted-pair for the best EMI
performance.
CASCADE IN Status indicators are defined below:
AUDIO Tx
LED – lights when the AM2’s audio is successfully
transmitted to, and received by, the AM2. If this is off, check
the cable.
AUDIO Rx
LED – lights when the connected AM2 successfully
sends audio which also proves this twist in the cable is correct.
COMM
LED – lights green when the AM2’s CASCADE OUT
is properly communicating with the other AM2 and proves
that the twisted pair for Comm in the cable is good. If this
indicator is off, the cable is not a happy camper.
POWER
LED – is always on when the AM2 is powered. If the
AM2 is powered and this is off, make sure the power twisted
pair in the connected cable is not shorted.
AM2
AUTOMIXER
POWER
LOCATE
OUT
IN
CASCADE
RAD
1
MIC INPUTS
SIG
OL
2
SIG
OL
LEVEL
3
SIG
OL
LEVEL
4
SIG
OL
LEVEL
5
SIG
OL
LEVEL
6
SIG
OL
LEVEL
7
SIG
OL
LEVEL
8
SIG
OL
LEVEL
OUTPUT
SIG
OL
LEVEL
LEVEL
POWER
COMM
AUDIO RX
AUDIO TX
OPERATION
