6
Audio Design Associates
www.ada-usa.com
PTM-3245
www.ada-usa.com
7
Terminating the Detachable Speaker Connectors
The PTM-3245 includes a detachable high-current speaker connector for each channel. These connectors
will accept wire down to AWG 12. To terminate the speaker connectors, follow these steps:
1. Strip just enough insulation from the speaker wire to expose 1/4" of bare wire to fit into the
connector.
2. Loosen each of the four set screws on each connector with a small (1/8" wide) flat blade screwdriver
enough to insert the stripped bare speaker wire.
3. Before inserting the wire into the connector, twist all its strands tightly to prevent strays that could
cause a short circuit. You may want to “tin” the stripped wire with solder to prevent it from fraying
and oxidizing.
4. Insert the stripped bare wire into the connector. Refer to the drawing below for correct speaker
polarity and channel designation.
5. Label the speaker cables to identify them with their corresponding zone. This procedure will save
time in case troubleshooting is necessary.
6. Tighten the set screws firmly, but not over tighten.
Correct Speaker Polarity is Important
Polarity refers to the positive (+) and negative (–) speaker connections. Speaker wires are coded with
printing or a ridge on the insulation on one of the leads so you know which lead was connected to the
+ and – terminals at the other end. This coding will help you keep the + and - polarity consistent for all
channels of the PTM-3245. The detachable speaker connectors used for the PTM-3245 are numbered
to correspond to the following code for all channels:
Positive (+) Left Channel Terminal: 1
Negative (-) Left Channel Terminal: 2
Negative (-) Right Channel Terminal: 3
Positive (+) Right Channel Terminal: 4
Plugging the Speaker Connectors into the PTM-3245
Once you have terminated the speaker wire to the detachable female connectors, plug them into the
corresponding male rear panel connectors on the rear panel of the PTM-3245. The connectors are
keyed so they can only be inserted one way. Never try to force the connectors into place.
1
2
3
4
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
R
10K
10K
R
L
ZONE 9
16-2
Ω
+
R
- -
L
+
ZONE 10
16-2
Ω
10K
10K
WARNING! Risk Of Hazardous Energy!
Make Proper Connections.
4 3 2 1
1 2 3 4
1 2 3 4
1 2 3 4
1
2
3
4
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
Speaker Connector
Terminated and Connected
