d&b audiotechnik D12 Hardware Manual

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d&b audiotechnik D12 Hardware Manual Manual pdf 14 page image

4.2. Indicators4.2.1. LC Display [4]OVLGRISPOVLGRISP[4] [5][6][7][5][6][7]CH A CH BFig. 7: D12 Indicators in detailServes as a user interface and display for all configuration settings andstatus 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 theD12 Software manual, which is also provided with the D12.4.2.2. ISP LED (A/B) - Input Signal Present (green) [5]- Input - analogIlluminates when the D12 input signal exceeds–30 dBu: the ISP indication is unaffected by the setting of the levelcontrol and the MUTE function but will not operate in STANDBYmode.- Input - digital (AES/EBU)Illuminates when the D12 digital input is locked to 48or 96 kHz and the signal exceeds –57 dBFS(FS = Full Scale): the ISP indication is unaffected by the setting of thelevel control and the MUTE function but will not operate in STANDBYmode.IMPORTANT! Notes on the digital AES/EBU input ⇒⇒⇒⇒ Sampling ratesThe two sampling rates 48/96 kHz are supported by the digitalAES/EBU input of the D12.Other (standard) sampling rates (e.g. 32/44.1 or 88.2 kHz) will bedetected 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 limitercircuit reduces gain by more than 3 dB.This state is not critical but shows that the system has reached itslimits.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 dBor the D12 is trying to deliver too high an output current. If in doubtreduce the input gain at the D12 level control. If the error messagedisappears, the output current has been too high (load impedancetoo low caused by too many loudspeakers connected to the D12output, or a defective cable or connector). If the condition does notchange, the input signal to the D12 is too high (greater than+25 dBu).An overload could also be caused by accumulating the source inputA+B or by high gain settings (boosts) in the single EQ bands, whilethe input signal is lower than +25 dBu.- Flashes (1:1 mark space) ⇒⇒⇒⇒ Error: an error message will bedisplayed altering with the device name.D12 Amplifier, Hardware manual (4.7 EN) Page 14 of 28