TOA Electronics TA 1400 Unbalanced inputs, ¼” TRS plug, Unbalanced line connection, equipment

Within the Neutrik® Combojack there is a ¼”(6.3mm) phone jack, which is wired in parallel with the XLR.

TIP	HOT
RING	COLD
SLEEVE	SHIELD/GROUND

Figure 6. ¼” TRS plug

The input impedance is high enough (20 kohms balanced) to allow ”daisy-chaining”, or multiple parallel input connections. The headroom of the input circuits is also high enough to accept the maximum output level from virtually any low-level signal source. Balanced signals are less sensitive to AC hum and radio interference. The source impedance should be less than 1 kohms to avoid high frequency loss in long cables.

To daisy chain amplifiers, use the screw-terminal (Phoenix connector), labeled Link, provided on each channel. It is connected in parallel with the Neutrik® Combo jack on each input.

7.1.2 Unbalanced inputs

To connect an unbalanced source, tie pin 3 (ring on TRS jack) down to the shield of the connector. If you leave one pin disconnected, you will lose 6 dB.

A better method for using unbalanced sources is shown in Figure 8. This is similar to the connection for balanced lines, but pin 3 is connected to the shield at the source. The hum and noise rejection for the cable is equivalent to that for a balanced line. To minimize hum in the audio, use balanced inputs whenever possible.

Figure 7. Unbalanced line connection	Figure 8. Balanced line with unbalanced
	equipment

For two-channel (stereo) operation, use both channels A and B. For tandem stereo or bridged mono operation, use only one of the inputs. See operation modes for more details.

Tannoy Limited	11
TA 1400 User Manual	11-06-02