![3.3.4 Input Connection](/images/new-backgrounds/19221/1922127x1.webp)
Studio Reference I & II Professional Studio Amplifiers
3.3.4 Input Connection
The balanced inputs have a nominal impedance of 10 K ohms (5 K ohms unbalanced) and will accept the
Correct input wiring depends on two factors:
(1)whether the input signal is balanced or unbal- anced, and (2) whether the signal floats or has a ground reference. Figures 3.8 and 3.9 show the recom- mended connection techniques for each combination of source signal characteristics.
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| INPUT |
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Floating | Shield connected |
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source | to ground terminal |
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Output + |
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| cable |
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| shielded |
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(or battery power) |
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| INPUT |
| 3 |
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| 1 | 2 |
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Grounded | Shield is not |
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source | connected |
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| at this end |
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Output + |
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(or other ground connection) |
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| – + |
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| INPUT |
| 3 |
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Floating | 1 | 2 |
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Shield connected to both |
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source | negative |
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| input terminals |
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Output + |
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| conductorcoax |
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| – + | twistedpair | ||
(or battery power) |
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| Note: If two or more channels with |
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| the same input ground reference |
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| INPUT | 1 | 2 | |
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| floating source, connect | |||
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Floating only one shield to the |
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source | source chassis. |
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Output | – |
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| + |
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(or battery power)
– +
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| INPUT |
| 3 |
Grounded | 1 | 2 | ||
Shield not connected |
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source |
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at this end |
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Output | – |
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(or other ground connection)
Fig. 3.9 Balanced Input Wiring
The amplifier’s
If you install a P.I.P. module other than the
If the amplifier will be used in
+
Grounded | INPUT | 1 2 | |
Input ground | Single- or | ||
source | |||
terminal not used | |||
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–
SHIELD
BALANCED
Output + |
(or other ground connection) |
Fig. 3.8 Unbalanced Input Wiring
+
UNBALANCED
SHIELD
Fig. 3.10 Balanced and Unbalanced Phone Plugs
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