Crown SMX-6 ユーザーズマニュアル
Page 15
IQ Mixer / Multiplexer Hardware Installation
Rev. 0
added to the audio lines. Use only the signal
lines which normally connect to pins 2 and 3 of
the XLRs.
lines which normally connect to pins 2 and 3 of
the XLRs.
Note: Because typical mic cables
have high capacitance, the maximum possible
Crown Bus loop distance will be less.
Crown Bus loop distance will be less.
Outside RF interference is seldom a problem for a
Crown Bus loop…especially if shielded twisted-pair
wire is used. However, there are extreme situations
when fiber optic wiring is recommended. For ex-
ample, locating a Crown Bus loop next to an AM
radio transmission line may require fiber optic ca-
bling. An extremely long Crown Bus loop distance
(greater than 10 miles) may also require fiber optic
cabling.
Crown Bus loop…especially if shielded twisted-pair
wire is used. However, there are extreme situations
when fiber optic wiring is recommended. For ex-
ample, locating a Crown Bus loop next to an AM
radio transmission line may require fiber optic ca-
bling. An extremely long Crown Bus loop distance
(greater than 10 miles) may also require fiber optic
cabling.
Some examples of twisted pair wiring follow. Figure
3.6 shows point-to-point wiring for the Crown Bus
using two female removable barrier block connec-
tors:
3.6 shows point-to-point wiring for the Crown Bus
using two female removable barrier block connec-
tors:
Some IQ components use separate 5-pin and 4-pin
DIN connectors for Crown Bus input and output
wiring. Connecting to them is shown below:
DIN connectors for Crown Bus input and output
wiring. Connecting to them is shown below:
The IQ components in each Crown Bus loop are
wired in series. The output of one IQ component
÷loopsš to the input of the next and so on. This is
shown in Figure 3.9.
wired in series. The output of one IQ component
÷loopsš to the input of the next and so on. This is
shown in Figure 3.9.
Fig. 3.10 An Audio Input Section
Pro audio
equipment
Semi-pro or
consumer
equipment
Dynamic
mic, speech
Condenser
mic, speech
Hot
condenser
mic, speech
Dynamic
mic, music
Hot
condensor
mic, music
Close-miked
dynamic mic,
bass/drums
Close-miked
dynamic mic,
kick drum,
guitar amp
dBm/dBV
dBu
Suggested
Setting
+4 dBm
+4 dBu
–4 (L)
–10 dBV
–8 dBu
+8 (L)
–75 dBV
–73 dBu
+21 (M)
–65 dBV
–63 dBu
+11 (P)
–45 dBV
–43 dBu
+18 (P)
–55 dBV
–53 dBu
+21 (M)
–25 dBV
–23 dBu
–2 (P)
–15 dBV
–13 dBu
–12 (M)
–5 dBV
–3 dBu
–12 (M)
or
+3 (L)
0 dBm = 0.775 VRMS with a 600 ohm load, 0 dBV = 1 VRMS, 0 dBu = 0.775 VRMS
Fig. 3.11 Suggested Audio Input Gain Control Settings
Fig. 3.12 Balanced Audio Input Wiring
+
–
Shield connected
at both ends
INPUT
+
–
2-wire line cord
(or battery power)
Output
Note: If more than one
input is driven from the same
source equipment, connect only
one shield at the source
equipment chassis.
Microphone
INPUT
Floating
source
+
–
3-wire grounded line cord
(or other ground connection)
Output
Shield not connected
at this end
at this end
INPUT
Grounded
source
+
–
+
–
+
–
AUDIO
IN
IN
1
L
M
P
0
-5
-10
-12
5
10
15
21
ADD 25
FOR MIC
FOR MIC
3.3 Connecting the Audio Ins & Outs (Step 3)
IQ mixer/multiplexers have 6 mic/line inputs and
2 stack inputs. (Input 6 of the
2 stack inputs. (Input 6 of the
AMB-5 is dedicated
for ambient sensing and is discussed in Section
3.3.2.) For output, there are two audio channels that
feed two main and two auxiliary bus outputs.
3.3.2.) For output, there are two audio channels that
feed two main and two auxiliary bus outputs.
3.3.1 Mic/Line Inputs
Three-terminal removable barrier block connectors
are provided for the audio inputs. Each input has an
input selector switch. Slide it to the left (M) for
microphone signal levels up to +7 dBu (0 dBu =
are provided for the audio inputs. Each input has an
input selector switch. Slide it to the left (M) for
microphone signal levels up to +7 dBu (0 dBu =