McIntosh 7205thx User Manual

9

When using a McIntosh Control Center set all five level

controls to the 2V position. If a

preamplifier or control center

has a 1V output rating and/or a

built-in THX module, set the

controls to the 1V position. If

an increase or decrease in am-

plifier sensitivity is required for

other applications, set the

controls as desired. Refer to

Figure 2.

When using a McIntosh SL-1 powered subwoofer, set the

Sub Meter Cal control to the 1V THX position for the cor-

rect subwoofer amplifier power output indication. Refer to

Figure 1.

To have the MC7205 turn on or off when a control center

turns on or off, rotate the power switch to the remote posi-

tion. For manual operation, rotate the power switch to the

on or off position as desired.

Rotate the meter mode switch to select the meter operation

mode you desire:

Lights Off - Meter lights are turned off and the meters

are in the summed mode.

Summed - Each meter displays the combined outputs of

two channels. The left meter indicates the left

front combined with the left surround, the cen-

ter meter indicates the center combined with

the subwoofer and the right meter indicates

the right front combined with the right sur-

round. In this meter mode refer to the upper

meter scale(s).

Front/Ctr - The left meter indicates the left front channel,

the center meter indicates the center channel

and the right meter indicates the right front

channel. In this meter mode refer to the lower

meter scale(s).

Surr/Sub - The left meter indicates the left surround chan-

nel, the center meter indicates the relative

power of the subwoofer amplifier and the right

meter indicates the right surround channel. In

this meter mode refer to the lower meter

scale(s).

The MC7205 Power Output Meter scales are based on us-

ing 4 ohm loudspeakers. If 8 ohm speakers are used, the

actual power output is one half the power available to drive

4 ohm loudspeakers. Use the chart(s) below to determine

the actual power output sent to your loudspeakers. Refer to

figure 3.

Single Channel Meter Readings

Meter Reading

With 4

Ω 

Loudspeaker(s)

With 8

Ω 

Loudspeaker(s)

.02

.02 Watts

.01 Watts

.2

.2 Watts

.01 Watts

2

2 Watts

1 Watts

20

20 Watts

10 Watts

200

200 Watts

100 Watts

Summed Channels Meter Readings

Meter Reading With 4

Ω 

Loudspeaker(s) With 8

Ω 

Loudspeaker(s)

.04

.04 Watts

.02 Watts

.4

.4 Watts

.2 Watts

4

4 Watts

2 Watts

40

40 Watts

20 Watts

400

400 Watts

200 Watts

Figure 2

Figure 3