- TOA INSTALLATION AND OPERATING INSTRUCTIONS AMPLIFIER M-9000, A-9060DH, A-9120DH, A-9120DL, A-9060S, A-9120S, A-9240SH

AX I

LEVEL 0

(D11) Highest output level setting (when the AN-001T is used and ANC operation is set to ACTIVE)

Set the upper limit of the ANC-activated output level.

–15, –12, –9, –6, –3, 0 (default) dB

Note: Settable level is 3 dB or more above the lower limit (lowest output level).

Setting Range

PLE T I

E 20

(D12) Sampling time setting (when the AN-001T is used and ANC operation is set to ACTIVE)

Set the required time to measure ambient noise. The ambient noise level is determined by being averaged

over the set measuring time. When the measuring time is long, the output level changes slowly with the

ambient level. However, the change in output level is not susceptible to a sudden change in ambient noise

level.

10, 15, 20 (default), 30, 60, 120,180, 300 sec

Setting Range

(D13) Gain ratio setting (when the AN-001T is used and ANC operation is set to ACTIVE)

AIN RATI

3:3

Set the degree of change in the output sound level to that in ambient noise level, which is displayed as the

ratio "ambient noise level : output level."

6:3, 5:3, 4:3, 3:3 (default), 3:4, 3:5, 3:6, 6:–3, 5:–3, 4:–3, 3:–3, 6:–3, 5:–3, 4:–3, 3:–3, 3:–4,

3:–5, 3:–6

Setting Range

When the ratio of output level to ambient noise level is

great, the degree of change in output level becomes

greater than that in ambient noise level.

The greater the amount of change in output level is, the

faster the output level reaches the upper limit or lower

limit, causing the sound volume not to change any

more.

Contrary, when the ratio of output level to ambient

noise level is small, the degree of change in output

level becomes smaller than that in ambient noise level.

When the ratio of output level is positive, the output

level increases as the ambient noise level increases.

When the ratio of output level is negative, the output

level decreases as the ambient noise level increases.

For example, when the ratio "3 : 3" is selected, the

output volume level increases by 3 dB as the ambient

noise level increases by 3 dB.

Amount of change in output level (dB)

Amount of change

in noise level (dB)

(Reference level)

3:3 (Default)

6:3