Mackie HD1221 - Appendix B: Connections; Daisy-Chaining Multiple Units

Appendix B: Connections
“XLR” Connectors
The HD1221 has one female XLR input that accepts
a balanced line-level signal. When connecting a balanced
signal,besureit’swiredperAES(AudioEngineering
Society)standards:
XLR
Pin1–Shield(Ground)
Pin2–Hot(+)
Pin3–Cold(–)
There is also a male XLR connector on the HD1221
labeledLOOPOUT.Thisisalsowiredaccordingtothe
AESstandardslistedabove.
Balanced XLR Connectors
TheLOOPOUTconnectorallowsyoutoconnect
severalHD1221s.Simplyplugthesignalsource
(i.e.,mixeroutput)intotheinputjack,andpatchthat
speaker’sLOOPOUTjacktothenextspeaker’sinput
jack,andsoon,daisy-chainingmultiplespeakers.See
below for a visual example of daisy-chaining.
There is a limit to how many HD1221s may
be daisy-chained together. A general rule
is to maintain a load impedance ten times
or more than the source impedance to
prevent excessive loading on the source. For example, if
the mixer has an output impedance of 120
, then you
can daisy chain up to nine HD1221s. This is a load of
1222
(HD1221inputimpedance=11k ;9ofthesein
parallel=1222
).Sincemicrophonestypicallyhavea
higher output impedance, you should limit
daisy-chaining from a mic source to two HD1221s.
TheLOOPOUTjackiswiredstraightfromthemain
input connector — there is no electronic circuitry
between—sothesignalcomingoutoftheLOOPOUT
jack is exactly the same as the signal going in.
DAISY-CHAINING MULTIPLE HD1221 S
POWER
LIGHT ON
MAIN
INPUT
LOOP
OUT
LEVEL
+
HD1221
2-WAY HIGH DEFINITION POWERED LOUDSPEAKER
VOICING MODE
POWER
ON
REVISION
PARALLEL
POWER
LIGHT ON
MAIN
INPUT
LOOP
OUT
LEVEL
+
HD1221
2-WAY HIGH DEFINITION POWERED LOUDSPEAKER
VOICING MODE
POWER
ON
REVISION
PARALLEL
POWER
LIGHT ON
MAIN
INPUT
LOOP
OUT
LEVEL
+
HD1221
2-WAY HIGH DEFINITION POWERED LOUDSPEAKER
VOICING MODE
POWER
ON
REVISION
PARALLEL
POWER
LIGHT ON
MAIN
INPUT
LOOP
OUT
LEVEL
+
HD1221
2-WAY HIGH DEFINITION POWERED LOUDSPEAKER
VOICING MODE
POWER
ON
REVISION
PARALLEL
Mixing Console
(Mackie 1604-VLZ3 shown)
to next
speaker
L/R
MAIN
OUT
to next
speaker
15
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