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

Input Ground

The CHASSIS GROUND terminal is internally

connected to the chassis, the AC earth ground, and the

power amplifier's signal ground. The INPUT GROUND

terminal is tied to the XLR pin 1 and the 1/4" jack sleeve.

It is recommended that the input and chassis ground ter-

minals remain connected with the factory-supplied jumper

strap.

In situations where the power amp and its signal

source are separated by great distances, a ground voltage

difference may exist between the amp's chassis ground

and the input cable's ground. Connection of these two

grounds through the jumper strap may cause large ground

currents to flow (which is known as a ground loop), caus-

ing a hum noise in the amp's output. Unless you have

such a situation with a hum problem that cannot be solved

by using balanced input connections, the ground jumper

strap should remain in place.

7.2

Normal/Bridging Switch

This switch selects between NORMAL mode in

the "out" position where both channels are in-phase, and

BRIDGING mode in the "in" position where channel 1

input is used to drive both channels, inverting the phase

of channel 2. In BRIDGING mode, the channel 1 red

binding post is the (+) in- phase speaker output terminal

and the channel 2 red binding post becomes the (-) out-

of-phase speaker terminal. It is not necessary to depress

the MONO switch in order to operate in BRIDGED mode.

The BRIDGING switch overrides either setting of the

Stereo/Mono Switch.

7.3

Stereo/Parallel Mono Switch

This switch selects between STEREO mode in

the "out" position and PARALLEL MONO mode in the

"in" position. In PARALLEL MONO mode, channel 1

and channel 2 inputs are internally tied together before

the input attenuator, allowing discrete channel control of

a mono signal. CAUTION: Be sure not to have two sig-

nal sources connected to ch.1 and ch.2 inputs when in

parallel mono mode, as it would short-circuit these two

signals and result in no output.

7.4

Level Controls

The level controls allow attenuation (calibrated

in dB) of the input signal. In PARALLEL MONO mode,

channel 1 and channel 2 inputs are tied together, while

still preserving independent level control per channel. In

BRIDGED mode, use only channel 1 level control. It is

recommended that the level controls be operated at full

level (0 dB attenuation) in most situations to maximize

the headroom in the signal source.

7.5

Speaker Outputs - Binding Posts

A pair of dual banana binding posts provide the

stereo speaker outputs. In BRIDGING mode, the channel

1 red binding post is the (+) in-phase speaker output ter-

minal and the channel 2 red binding post becomes the (-)

out-of-phase speaker terminal.

CAUTION! NEVER CONNECT THE TWO RED

BINDING POSTS TOGETHER OR CONNECT

EITHER RED BINDING POST TO A BLACK

BINDING POST!