User manual XTA D2

[. . . ] ü When the unit is bypassed, all its metering and status LEDs will dim. All metering will continue to function. Page 2 D2 Operators Manual Contents D2 Quick Reference Important Safety Information Thanks Unpacking the D2 Introduction Features 2 4 5 5 6 6 Front Panel Familiarisation Rear Panel Connections Operating the D2 Switching the unit on and start-up procedure Press-and-hold Keys Minimum and maximum control positions 7 9 10 10 10 10 What is Dynamic EQ?Setting the Attack and Release times Operating Notes Operating Level Grounding 11 13 14 14 14 Specifications Warranty Options and Accessories 15 16 16 D2 Operators Manual Page 3 An example of this equipment has been tested and found to comply with the following European and international Standards for Electromagnetic Compatibility and Electrical Safety: Radiated Emissions (EU): RF Immunity (EU): Electrical Safety (EU): EN55013-1 (1996) EN55103-2 (1996) RF Immunity, ESD, Burst Transient, Surge, Dips &Dwells EN60065 (1993) Important Safety Information Do not remove Covers. No user serviceable parts inside, refer servicing to qualified service personnel. [. . . ] Hold key to change modes. D2 Operators Manual Page 7 Band Frequency Control: Select the centre (or corner in the case of shelving response) frequency of the band to be controlled. 'Q' Control: Select how wide the band of frequencies to be controlled is, from 2 Octaves (bandwidth = 0. 5 ­ wide) to 0. 125 Octaves (bandwidth = 8 ­ narrow) . Gain Reduction Meter: The red LEDs indicate progressively more gain reduction up to 15dB. LISTEN Key: Switches the output of the sidechain filter into the main signal path, so that the required range of frequencies may be more easily selected. Shelf Key: Switch between a bandpass filter (with variable bandwidth) and a shelving response. Full Range LED: To enable the band to work as a full range compressor/expander, press the SHELF, and then turn the frequency control fully clockwise/anti-clockwise (for bands 1 & 3 respectively). Page 8 D2 Operators Manual Rear Panel Connections Power Switch: turns the units mains supply off and on. Mains Fuse: located in a finger-proof holder adjacent to the mains inlet. Mains Inlet: connected via a standard IEC socket. Audio In-Out: 3 pin XLR sockets are provided for each channel. All are fully balanced, pin 2 hot, 3 cold, 1 screen. Always replace the fuse with the correct type and rating as shown on the rear panel legend. D2 Operators Manual Page 9 Operating the D2 Operation of the D2 is very straightforward, but there are a few points worth noting which, once understood, will make using the unit even easier. Switching the unit on and start-up procedure After plugging in the power and switching the power on suing the rear panel switch, confirmation is quickly given that all is well by various status LEDs illuminating almost immediately after power-up. These will include, as a minimum, METER (In/Out); MODE (Cut Above/Below); and Band Active LEDs . The gain reduction will fully illuminate and, after the bypass relays disengage, begin to `count down' accompanied by the output level fading up to normal operating level. The entire process is complete when the input/output meters and gain reduction begin to operate normally. Press-and-hold Keys The legending on the front panel alerts the user to the fact that several keys require a `press and hold' action to initiate them. These keys relate to functions that could accidentally introduce large changes of level at the outputs, causing undesirable effects and possible damage. These keys have their function marked in BOLD (and a different font) to make it clear that they will only change state if the key is held in for a time. MODE ­ switching between `cut below' mode and `cut above' mode (See page nn) LISTEN ­ switching output to monitor any band's sidechain EQ signal (See page nn) FULL RANGE­ switching middle band into full range mode (See page nn) Minimum and maximum control positions To ensure that the D2 is 100% accurate all of the time, and that what it says on the front panel is exactly what the unit is doing, it has been necessary to introduce `end-stops' on the controls. The extreme regions on each control marked with the curved line designate this entire region as relating to the parameter value shown. This is to compensate for the mechanical tolerances of the potentiometers. Page 10 D2 Operators Manual What is Dynamic EQ?Dynamic EQ is essentially a compressor or expander that can be set to respond and act upon only a certain range of frequencies. Its behaviour is dependent on the operating mode chosen: the operating modes are explained in detail below. Mode I: "Cut Above" Having selected the frequency band to work with, the dynamic eq will listen to this band and act upon it by cutting(compressing) any frequencies present in it that go above the predetermined threshold. Consider the example below where the threshold is set to ­20dB, and the selected frequency band is centred around 1kHz, with a `Q' of 1. 0. Signals below the threshold will pass unaltered, but as increasing signal is applied, those frequencies centred around 1kHz will be cut or compressed. [. . . ] See the following diagram for details. XLR pin 1 Isolation points (arrowed) and 10dB pads (circled) Page 14 D2 Operators Manual Specifications Inputs: 2 electronically balancedu Impedance: > 10k ohms. Level: +20dBm into 600 ohm Frequency Resp. :+½dB 20Hz-20kHz Dyn Range:>110dB 20Hz-20k unwtd Distortion:< . 02%@1kHz, +18dBm Dynamic EQ Bands: Threshold: -30dBu to +22dBu Ratio: 1:1 to 16:1 Attack: -60uS to 250mS Release: 25mS to 4 S Make-up Gain: 0 to +15dB Sidechain EQ Section Type: Selectable high/low shelf or narrow/wide parametric response. Centre/corner Freq: 20Hz to 20k Gain: +6, 9 or 15dB and `Off' Sidechain monitor available. Optional Interfaces AES/EBU Digital Input/Output Due to continuing product improvement the above specifications are subject to change. Input/Output meter: 6 point, -12dBu to +18dBu. [. . . ]