d&b audiotechnik D12 Hardware Manual

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d&b audiotechnik D12 Hardware Manual Manual pdf 8 page image

3.3. Digital signal processingThe digital signal processing provides loudspeaker specific setups thatare selected using the front panel controls. These setups include allloudspeaker equalization and protection functions.A 4-band parametric equalizer is incorporated in each channel toprovide optional Boost/Cut or Notch filtering. A signal delay capabilityalso allows delay settings of up to 340 msec. (= 100 m/328.1 ft) to beapplied independently to either channel.A signal generator offering pink noise or sine wave program can beselected from the front panel controls.Each unit can be given a unique Device Name to simplify identificationand a password protected LOCK function is also incorporated to inhibitunauthorized setup changes.IMPORTANT! System configurations are specific to the characteristics of eachloudspeaker and affect the frequency response and maximum outputlevel. To ensure optimum performance and prevent damage to systemcomponents each type of loudspeaker has to be used in conjunctionwith a suitably configured D12.The D12 digital signal processing circuits introduce a processing delayof 0.3 msec. into the signal path. If two identical loudspeakers aredriven by different controllers the respective delays of the units usedhave to be considered (D12 = 0.3 msec., E-PAC = 1.0 msec. andA1/P1200A no delay). The D12 effectively positions its respectiveloudspeaker at a distance of 24 cm (0.79 ft) in front of a loudspeakerdriven by the E-PAC and 10 cm (0.33 ft) behind a loudspeaker drivenby the A1/P1200A.Where the two loudspeakers form an array this will lead to an increasein comb filtering and unpredictable coverage patterns. If the distancebetween the cabinets is much greater than 1 m (3 ft) this effectbecomes negligible.Please note that all digital signal processing equipment used in thesignal path will delay the signal. For example external digital equalizershave a typical processing delay of about 3 ms.D12 Amplifier, Hardware manual (4.4 EN) Page 8 of 28