DA6 OPERATORS MANUALCONTENTS:
CAUTION - MAINS FUSE
CAUTION - MAINS CABLE
CAUTION - SERVICING
CAUTION - HEADPHONES
The Drawmer DA6 is a six channel stereo output ( or twelve mono ) distribution amplifier featuring XLR balanced connections. Optional transformer balanced outputs are offered for instanced where electrical isolation of remote equipment is required. The electronically balanced stereo input features individual left/right level controls with LED bargraph metering enabling the correct balancing of stereo material or two mono signals.
Each of the six output pairs incorporate further left/right level controls and a Mono/Stereo switch which will mix two stereo signals, or, connect a single mono signal to both stereo outputs. The monitor section consists of a channel select so that the individual left/right output level of each channel can is displayed on the output LED bargraph and can be simultaneously heard at the front-panel headphone jack. An auxiliary pair of balanced output jacks provide a facility to connect further DA6 units where even more distribution is required. These outputs are post input gain trim, and may be fitted with optional output isolating transformers.INSTALLATION
The DA6 is designed for standard 19" rack mounting and occupies 1U of rack space. Avoid mounting the unit directly above power amplifiers or power supplies that radiate significant amounts of heat. Always connect the mains earth to the unit. Use fibre or plastic washers to prevent the front panel becoming marked by the mounting bolts.
Input and Output audio connections are provided via balanced XLRs at a level of +4dBu. This applies to both inputs and outputs. The wiring convention being: Pin 1 Ground; pin 2 Hot; and pin 3 Cold. For use with unbalanced systems, the Cold pin 3 must be grounded at both input and output inside the XLR connectors.
The Stereo Link Outputs are balanced 1/4" (TRS) jack sockets, where Tip connection is Hot; Ring is Cold; and Sleeve is Ground. These connections are offered for chaining multiple DA6 units if there is a requirement for more than 6 stereo outputs.
If the unit is to be used where it maybe exposed to high levels of disturbance such as found close to a TV or radio transmitter, we suggest that the unit be operated using an optional wiring of the balanced configuration. The screens of the signal cables should be connected to the chassis connection on the XLR connector as opposed to connecting to pin1. The DA6 fully conforms to the EMC standards.
If ground loop problems are encountered, never disconnect the mains earth, but instead, try disconnecting the signal screen on one end of each of the cables connecting the outputs of the MX40 to the patchbay. If such measures are necessary, balanced operation is recommended.
The DA6 has the capability of being isolated at its outputs using low impedance (600 ) balanced transformers. Each output can be individually isolated, and it is possible to have mixed configurations where some outputs retain their default connection of electronically balanced. Isolating transformers can be factory fitted, or alternatively, retro fitted by a Drawmer appointed service agent, or a suitably qualified engineer. The isolating transformer is manufactured by Beyer (Gmbh) and has a part reference TR/BV310-101-031. The part reference from Drawmer stock is #6105. Any warranty will be void if isolating transformers are fitted by non-approved methods, or, if unspecified transformers are fitted.
For the purposes of monitoring each output, a stereo 1/4" (TRS) jack socket is offered on the front panel. This having the standard wiring convention of Tip being Left; Ring being Right; and Sleeve being common Ground. This output is capable of driving headphones with an impedance between 8 and 600 . The amplifier has an output of approximately 1Watt. Caution is required when operating at high output levels with low impedance headphones.
The DA6 unit will have been supplied with a power cable suitable for domestic power outlets in your country. For your own safety it is important that you use this cable to connect to the mains supply earth. The cable should not be tampered with or modified.
The power supply socket has an integral fuse drawer containing the power fuse (and a spare). Removal of the drawer is only possible with the power cord removed. The fuse should never blow under normal operation. If the fuse is suspected of having blown, then a fault will have occurred and this fault condition should be inspected by a qualified service engineer. When changing the fuse, always comply with the Safety Instructions.
If, for some reason, the unit is to be operated at a mains input voltage which is different to that as supplied, the following procedure must be carried out by a qualified technical engineer. If the voltage change process is to be repeated often, a simple switch can be fitted to simplify this procedure, this part (item # 7026) is available via your Drawmer dealer.
For conversion to 115Volt AC (previously set to 230Volt AC)
For conversion to 230Volt AC (previously set to 115Volt AC)
In both cases:
The DA6 has been designed for ease of use. It operates on balanced or unbalanced signal levels in the range -15dB to +15dB.Input L&R
OUTPUT IMPEDANCE:33 Ohms (electronically balanced)
MAX. INPUT LEVEL: Bal. +23.5dB Unbal. +18dB
MAX. OUTPUT LEVEL: Bal. +22.5dB Unbal. +17.5dB into 600 Ohms
HEADPHONE AMPLIFIER: 1 Watt into 8 Ohms
HEADPHONE IMPEDANCE: 8 Ohms to 600 Ohms
NOISE: Better than -95dB ( Gain=0dB @ 22Hz - 22KHz)
CROSSTALK: > -90dB @ 10KHz (Input grounded, any channel output)
DISTORTION: @ 1KHz Output 0dB 0.008%
BANDWIDTH: 18Hz to 32Khz -1dB
Outputs fitted with the specified BEYERDYNAMIC transformer will have the following specification:-
Max. Output Level: +18.8dB into 600 Ohms.
Distortion @ 1kHz 0dB 0.008%
Bandwidth 10k Load
Output 0dB: 18Hz to 58kHz (-3dB point)
25Hz to 34kHz (-1dB point)
Output +10dB: 66Hz to 58kHz (-3dB point)
87Hz to 34kHz (-1dB points)
Bandwidth 600 Ohm Load
Output 0dB: 22Hz to 22kHz (-3dB point)
31Hz to 12kHz (-1dB point)
Output +10dB: 82Hz to 22kHz (-3dB point)
109Hz to 12kHz (-1dB point)
The Beyerdynamic transformer has a load dependent insertion loss of 4dBs into 600 (0.3dB into 10k ). The transformer output is optimised for loads between 600 and 1M in parallel with a capacitance of 5pF to 150pF.
POWER REQUIREMENTS: 115Volt or 230Volt at 50-60Hz, 30 Watts