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4.2. Indicators

4.2.1. LC Display [4]

OVLGRISPOVLGRISP

[4] [5][6][7][5][6][7]

CH A CH B

Fig. 7: D12 Indicators in detail

Serves as a user interface and display for all configuration settings and

status information.

The display is illuminated and can be set to "on/off/timeout 10 s."

A detailed description of the menu structure and access is given in the

D12 Software manual, which is also provided with the D12.

4.2.2. ISP LED (A/B) - Input Signal Present (green) [5]

- Input - analog

Illuminates when the D12 input signal exceeds

–30 dBu: the ISP indication is unaffected by the setting of the level

control and the MUTE function but will not operate in STANDBY

mode.

- Input - digital (AES/EBU)

Illuminates when the D12 digital input is locked to 48

or 96 kHz and the signal exceeds –57 dBFS

(FS = Full Scale): the ISP indication is unaffected by the setting of the

level control and the MUTE function but will not operate in STANDBY

mode.

IMPORTANT!

Notes on the digital AES/EBU input ⇒

⇒⇒

⇒ Sampling rates

The two sampling rates 48/96 kHz are supported by the digital

AES/EBU input of the D12.

Other (standard) sampling rates (e.g. 32/44.1 or 88.2 kHz) will be

detected but not supported.

Non standard sampling rates will be ignored.

4.2.3. GR LED (A/B) - Gain Reduction (yellow) [6]

- Illuminates depending on the input signal: the D12 limiter

circuit reduces gain by more than 3 dB.

This state is not critical but shows that the system has reached its

limits.

4.2.4. OVL LED (A/B) - Overload (red) [7]:

- Illuminates depending on the input signal ⇒

⇒⇒

⇒ Overload:

either the input signal level is too high, gain reduction exceeds 12 dB

or the D12 is trying to deliver too high an output current. If in doubt

reduce the input gain at the D12 level control. If the error message

disappears, the output current has been too high (load impedance

too low caused by too many loudspeakers connected to the D12

output, or a defective cable or connector). If the condition does not

change, the input signal to the D12 is too high (greater than

+25 dBu).

An overload could also be caused by accumulating the source input

A+B or by high gain settings (boosts) in the single EQ bands, while

the input signal is lower than +25 dBu.

- Flashes (1:1 mark space) ⇒

⇒⇒

⇒ Error: an error message will be

displayed altering with the device name.

D12 Amplifier, Hardware manual (4.9 EN) Page 14 of 28

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