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Operating Manual - FTX-1001, FTX-1501, FTX-2001, CFT-1800 Power Amplifier

7. REAR PANEL FEATURES

7.1 Inputs

The standard input panel of the FTX Series III

amps is equipped with balanced 1/4" tip-ring-sleeve (TRS)

phone jacks, balanced XLR jacks, and balanced screw-

terminal inputs. The three types of connectors are inter-

nally wired in parallel and may be used with balanced or

unbalanced connections. The inputs are configured for

pin 2 hot, meaning that a positive voltage applied to pin

2 will result in a positive output voltage across the speaker

terminals. Pin 2 of the XLR jack is equivalent to the tip

of the 1/4" TRS jack. An optional input transformer is

available on all FTX and CFT amplifiers.

Balanced Inputs

It is recommended that balanced input connec-

tions be used whenever possible to reduce ground-loop

and environment-induced hum and noise. The (+) signal

is on pin 2 of the XLR, and the tip of the phone jack. The

(-) signal is on pin 3 of the XLR, and the ring of the phone

jack.

Unbalanced Inputs

If an unbalanced input connection is used, then

the (-) connection (XLR pin 3) should be connected to

input ground ( XLR pin 1). If the 1/4" input jack is used

unbalanced, the use of a mono (tip-sleeve) plug will au-

tomatically tie the (-) connection to input ground. Never

float pin 2 or pin 3 when using an unbalanced signal.

Figure 7.1: Balanced Input Connections Figure 7.1a: Unbalanced Input Connections

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 19 20

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