User manual XTA DP548 DATASHEET

[. . . ] Third press will drop back to the default screen. Use the BACK and NEXT keys to select the sub-menu required, and enter the sub-menu using the ENTER key. The Menus and their Contents GLOBAL MEMORY Sub-menu: Recall/Store/Erase input, graphic EQ, dynamic EQ, and crossover settings, or combinations of these. INPUT SECTION Sub-menu: Set up input ganging, and GEQ `Q' setting. [. . . ] Up to 128 shadow units may be connected and assigned the same ID as the `main' unit, but remember that the maximum total units on any one RS485 network is 128. Shadow ID numbers are accessible when the unit's interface is configured, and will appear after ID number 128, starting from 1 again, but designated shadow IDs with an `s' after the number ­ 1s. Any ID can have multiple corresponding shadows. RS485 Interface This interface is fitted as standard to all units and is accessed via the 3-pin XLR sockets on the rear of the unit. Cables to connect units together or to an RS232-485 converter will need to be wired one-to-one. We recommend the use of standard shielded microphone cables, or a balanced feed from a multicore. RS485 is a fully balanced system, capable of sending data over distances of up to one kilometre. Note, however, that this is the total length of connection. The RS485 output of each unit is purely hardwired from the input and so no electrical regeneration of the signal is provided. What this means is that the distance from the first RS485 output to the last RS485 input must not exceed 1km in total. As this diagram illustrates ­ The combined length of cables 01 + 02 + . . . NN < 1000 metres. Note that this includes any units set up as shadow IDs. Once a stable AES signal is being received, it will be permanently illuminated. The AES inputs are marked on the rear panel ­ for channels A & B use input A, and for channels C & D use input C. AES Output AES outputs are selected through the AES menu: AES/EBU Sub Menu Output Selection Pressing ENTER and then using BACK and NEXT chooses either Analogue or Digital. Digital The AES outputs are marked on the rear panel ­ Channels 1 & 2 use Output 1 Channels 3 & 4 use Output 3 Channels 5 & 6 use Output 5 Channels 7 & 8 use Output 7. Operator's Manual Page 33 ¤¤ ¤¤ ££ ££ ¢¢ ¢¢ ¡¡ ¡¡ AES Diagnostics and Status Information Also under the AES/EBU Sub Menu is the AES Status Information option, which can be used to check the incoming sample rate(s) and confirm that the data is being received correctly. Pressing ENTER will first show V1: AES Device Status V2: E E V3: A This display shows the correct operation of the three AES transmitters V1, V2 and V3. The letter after each is the silicon version (and is of no importance to the user). Pressing ENTER again will show AES Device Status V : 96k0 V : 96k0 This display shows the status of the two AES receivers, input A on the left, and Input C on the right. The sample rate the unit has been able to lock to is shown, or UNLOCKED will be displayed in its place. The unit will lock to sample rates from 32kHz up to and including 192kHz. The unit's own processing sample rate is 96kHz, and AES output data is always at 96kHz. Internal sample rate converters will translate all incoming rates to 96kHz ­ one converter for each AES input. This allows the two input streams to be at different rates if necessary. Page 34 DP548 Operator's Manual Security and Locking ENTER, After selecting the Security Sub Menu and pressing ENTER select one of the lock types, choosing the most appropriate one for your application. As ever, ENTER will confirm your selection. [. . . ] However, number 3 is a 12dB/Octave Butterworth filter with an Elliptical Low Pass filter following it. This produces a combined roll-off very close to that of the 48dB/Octave (with the side effect of the response rising again after the initial drop from the pass band). 1 2 3 To produce a crossover filter of this shape it is simply a case of setting the low (or high) pass filter for that output to the desired crossover frequency, and selecting a 12dB Butterworth response: OP1 Output 1 HPF /~~ Butterworth 12dB 250Hz Then select a parametric section on the same output, and modify its behaviour (using the ENTER key) until the corresponding HPF Elliptical filter is selected. Set the turnover frequency of this filter to be the same as that of the crossover filter. [. . . ]