Manual-5
MIC INPUTS
e rear panel, three-position Mic/Line switches set the mic
input gain such that the maximum signal permitted almost clips
the A/D converter. is is true for each switch position. e Mic
Inputs are automatically mixed using a gain-sharing algorithm.
Set the inputs using the black knobs so they do not (or rarely)
clip. en, 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.
e green Signal indicators should easily light for soft talk-
ers even at relatively low Level settings. e 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
e Main Output of an AM2 delivers the gain-sharing automix
of it’s Mic Inputs and all upstream inputs. e 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
e 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, xed-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
ashing, 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 dened below:
AUDIO Tx LED – lights when the AM2’s audio is successfully
transmitted to, and received by, the AM2. If this is o, 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 o, 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 o, make sure the power twisted
pair in the connected cable is not shorted.
AM2
AUTOMIXER
POWER
LOCATE
OUTIN
CASCADE
RAD
1
MIC INPUTS
SIG OL
2
SIG OLLEVEL
3
SIG OLLEVEL
4
SIG OLLEVEL
5
SIG OLLEVEL
6
SIG OLLEVEL
7
SIG OLLEVEL
8
SIG OLLEVEL
OUTPUT
SIG OLLEVELLEVEL
POWER
COMM
AUDIO RX
AUDIO TX
OPERATION
