DA 6
DISTRIBUTION AMPOPERATORS MANUALCONTENTSSAFETY CONSIDERATIONS

page 1INTRODUCTION

page 2INSTALLATION

page 2HEADPHONES

pages 1, 4

ISOLATING TRANSFORMERS

page 3

CONTROL DESCRIPTIONS

page 6

IF A FAULT DEVELOPS

page 8CONTACTING DRAWMER

page 8TECHNICAL SPECIFICATION

page 9BLOCK DIAGRAM

page 10COPYRIGHTThis manual is copyrighted © 2002 by Drawmer Electronics, Ltd. With all rights
reserved. Under copyright laws, this manual may not be duplicated in whole or inpart without the written consent of Drawmer.
ONE YEAR LIMITED WARRANTY
Drawmer Electronics Ltd., warrants the Drawmer DA6 audio processor to conform
substantially to the specifications of this manual for a period of one year from theoriginal date of purchase when used in accordance with the specifications detailed
in this manual. In the case of a valid warranty claim, your sole and exclusive
remedy and Drawmer’s entire liability under any theory of liability will be to, atDrawmer’s discretion, repair or replace the product without charge, or, if notpossible, to refund the purchase price to you. This warranty is not transferable. Itapplies only to the original purchaser of the product.
For warranty service please call your local Drawmer dealer. Alternatively call
Drawmer Electronics Ltd. at +44 (0)1709 527574. Then ship the defective product,with transportation and insurance charges pre-paid, to Drawmer Electronics Ltd.,
Coleman Street, Parkgate, Rotherham, S62 6EL UK. Write the RA number in large
letters in a prominent position on the shipping box. Enclose your name, address,
telephone number, copy of the original sales invoice and a detailed description ofthe problem. Drawmer will not accept responsibility for loss or damage duringtransit.
This warranty is void if the product has been damaged by misuse, modification orunauthorised repair.
THIS WARRANTY IS IN LIEU OF ALL WARRANTIES, WHETHER ORAL ORWRITTEN, EXPRESSED, IMPLIED OR STATUTORY. DRAWMER MAKES NOOTHER WARRANTY EITHER EXPRESS OR IMPLIED, INCLUDING, WITHOUT
LIMITATION, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESSFOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. PURCHASER’SSOLE AND EXCLUSIVE REMEDY UNDER THIS WARRANTY SHALL BE REPAIROR REPLACEMENT AS SPECIFIED HEREIN.
IN NO EVENT WILL DRAWMER ELECTRONICS LTD. BE LIABLE FOR ANYDIRECT, INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGESRESULTING FROM ANY DEFECT IN THE PRODUCT, INCLUDING LOSTPROFITS, DAMAGE TO PROPERTY, AND, TO THE EXTENT PERMITTED BY
LAW, DAMAGE FOR PERSONAL INJURY, EVEN IF DRAWMER HAS BEEN
ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
Some states and specific countries do not allow the exclusion of implied warranties
or limitations on how long an implied warranty may last, so the above limitationsmay not apply to you. This warranty gives you specific legal rights. You may haveadditional rights that vary from state to state, and country to country.

In the interests of product development, Drawmer reserve the right to modify orimprove specifications of this product at any time, without prior notice.



DA6 OPERATORS’ MANUALDRAWMER DA6Distribution Amp
SAFETY CONSIDERATIONSCAUTION - MAINS FUSE
TO REDUCE THE RISK OF FIRE REPLACE THE MAINS FUSE ONLY WITHTHE SAME TYPE, WHICH MUST BE A CLASS 3, 230 VOLT, TIME DELAY
TYPE, RATED AT 160mA WHERE THE MAINS INPUT VOLTAGE SWITCH ISSET TO 230 VOLTS AC. AND 315mA WHERE THE MAINS INPUT VOLTAGEIS 115 VOLTS AC.
ALL FUSES MUST COMPLY WITH IEC 127-2.
THE FUSE BODY SIZE IS 20mm x 5mm.

CAUTION - MAINS CABLE
DO NOT ATTEMPT TO CHANGE OR TAMPER WITH THE SUPPLIED MAINSCABLE.

CAUTION - SERVICINGDO NOT PERFORM ANY SERVICING. REFER ALL SERVICING TOQUALIFIED SERVICE PERSONNEL.

WARNINGTO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSETHIS EQUIPMENT TO RAIN OR MOISTURE.

CAUTION - HEADPHONESTHE HEADPHONE AMPLIFIER IN THIS UNIT IS CAPABLE OF PRODUCING
1 WATT INTO 8 SPEAKERS. DRAWMER DO NOT ACCEPT ANYRESPONSIBILITY FOR DAMAGE CAUSED TO OPERATOR HEARING ORSPEAKER DEVICES BY USE OF EXCESSIVE OUTPUT LEVELS.

DA6 OPERATORS’ MANUALINTRODUCTION
The distribution of mono and stereo balanced audio signals from a single source tomultiple destinations has many applications, including: multi-zone sound reinforcement
installation; live sports events coverage; broadcast studios; video suites; duplication
houses or where high quality audio has to be distributed to a number of locations downlong cable runs.
The Drawmer DA6 is a six channel stereo output ( or twelve mono ) distribution amplifierfeaturing 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 withLED bargraph metering enabling the correct balancing of stereo material or two monosignals. Each of the six output pairs incorporate further left/right level controls and aMono/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, andmay be fitted with optional output isolating transformers.

INSTALLATIONThe 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 radiatesignificant amounts of heat. Always connect the mains earth to the unit. Use fibre orplastic washers to prevent the front panel becoming marked by the mounting bolts.

AUDIO CONNECTIONS
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 andoutput inside the XLR connectors.
The Stereo Aux. Outputs are balanced ¼" (TRS) jack sockets, where Tip connection isHot; 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. For use with
unbalanced systems, use mono jack plugs, or connect the Ring (Cold) to the Sleeveterminal inside the Jack plugs.

DA6 OPERATORS’ MANUALInterference:

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, wesuggest that the unit be operated using an optional wiring of thebalanced configuration. The screens of the signal cables should beconnected to the chassis connection on the XLR connector as
opposed to connecting to pin1.
The DA6 fully conforms to the EMC standards.

Ground Loops:

If ground loop problems are encountered, never disconnect themains earth, but instead, try disconnecting the signal screen on
one end of each of the cables connecting the DA6 to the patchbay.
If such measures are necessary, balanced operation isrecommended.

ISOLATION TRANSFORMERSThe 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 tohave mixed configurations where some outputs retain their default connection ofelectronically balanced. Isolating transformers can be factory fitted, or alternatively,
retro fitted by a Drawmer appointed service agent, or a suitably qualified engineer.
Contact Drawmer for specifications.

Any warranty will be void if isolating transformers are fitted by non-approved
methods, or, if unspecified transformers are fitted.



DA6 OPERATORS’ MANUALMONITOR HEADPHONES
For the purposes of monitoring each output, a stereo ¼" (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.
DRAWMER do NOT accept any responsibility for damage caused tooperator hearing or speaker devices by use of excessive output levels.

POWER CONNECTION
The DA6 unit will be supplied with a power cable suitable for domestic power outlets inyour country. For your own safety, it is important that you use this cable to connect tothe mains supply earth. The cable must not be tampered with or modified.
The power supply socket has an integral fuse drawer containing the power fuse (and aspare) both of the same value, to suit the mains voltage for which the unit has been
supplied. Removal of the drawer is only possible with the power cord removed. The fuseshould 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 replacing the fuse, always comply with the Safety Instructions.
If the unit is to be used with a mains input operating voltage different to that for which
the unit is supplied, the following procedure must be carried out by a technicallycompetent person, (see following diagrams)
1:

Disconnect the unit from the mains.

2:

Using a number 1 size pozidrive screwdriver, remove the seven self
-tapping screws that retain the top cover. Two screws are found alongeach side; two along the top edge at the rear; and the upper central screw
on the front facia panel.

3:

Slide the voltage change-over switch (SW8) until the correct (or nearest)
mains input voltage is visible on the switch actuator.

DA6 OPERATORS’ MANUALFor conversion to 115Volt AC (previously set to 230Volt AC).....
4a
Exchange the 160mA fuse for a similar type rated at 315mA.

For conversion to 230Volt AC (previously set to 115Volt AC).....
4b
Exchange the 315mA fuse for a similar type rated at 160mA.

In both cases:
5:
Replace the top cover using the seven screws.
6:
Re-connect to mains power source.



DA6 OPERATORS’ MANUALCONTROL DESCRIPTION
The DA6 has been designed for ease of use. It operates on balanced or unbalanced
signal levels in the range -15dB to +15dB.(ref. +4dBm)

Input L&R

Used to set the optimal input gain for both Left and Right signals.
Use the display above to ensure the correct operating levels arebeing attained. Adjustment in the range ±15dB is possible.
Separate controls are offered to permit the re-alignment of any
offset stereo image.
These controls also adjust the output level of the auxiliary ‘link’
jacks, which implies that any connected slave DA6 will only require
to have its input trims set to 0dB (vertically).

Input Display

Since the DA6 is normally used as a line amplifier, then it is quite
acceptable to ‘see’ signals in the positive gain region of thisdisplay. However, ensure that the +15dB LED never illuminates
other than for brief instances, otherwise distortion will occur.

Output L&R

These controls should be used to set the optimal output level tomatch the input section of the connected device, for both Left andRight signals. Adjustment of ±15dB is possible. Normally, anystereo image offset will have been corrected by the Left/Right input
controls. However separate output controls are also offered to give
total control of the stereo image.

Mono/Stereo

Selects whether the channel output is to be separate Stereo
signals or ‘summed’ to produce a Mono signal. If only one input isused, this will be output to both sockets if Mono is selected.
Caution should be used when operating the DA6 with two similar
stereo signals that are out-of-phase with each other. Under suchconditions, using the Mono mode will produce very little usable
output. LEDs show the status of the switch.

DA6 OPERATORS’ MANUALChan SelectThis rotary switch selects which stereo (or mono) output is to berouted through to the stereo headphone amplifier.

H/PhoneThis control determines the amount of headphone amplifier drive.
Caution should be used when using high output levels and low
impedance headphones.

Output Display

This display shows the stereo output levels of the selected channel
feed to headphones, removing the need to utilise headphones asa method of monitoring the output signals.

DA6 OPERATORS’ MANUAL

IF A FAULT DEVELOPSFor warranty service please call Drawmer Electronics Ltd. Or their nearest authorised
service facility, giving full details of the difficulty. On receipt of this information, service
or shipping instructions will be forwarded to you. No equipment should be returned
under the warranty without prior consent from Drawmer or their authorised
representative.
For service claims under the warranty agreement a service Returns Authorisation (RA)number will be given. Write this RA number in large letters in a prominent position on
the shipping box. Enclose your name, address, telephone number, copy of the original
sales invoice and a detailed description of the problem.
Authorised returns should be prepaid and must be insured. All Drawmer products arepackaged in specially designed containers for protection. If the unit is to be returned,
the original container must be used. If this container is not available, then the equipment
should be packaged in substantial shock-proof material, capable of withstanding thehandling for the transit.

CONTACTING DRAWMER
Drawmer Electronics Ltd., will be pleased to answer all application questions to enhanceyour usage of this equipment. Please address correspondence to:Drawmer (Technical Help line) : Coleman St.: Parkgate : Rotherham : S62 6EL : UK
or, E-mail us on :tech@drawmer.com

Drawmer dealers, Authorised service departments and other contact information can beobtained from our web pages on
http://www.drawmer.com

DA6 OPERATORS’ MANUALTECHNICAL SPECIFICATIONSAll Levels ref.+4dBm
INPUT IMPEDANCE

15K

MAX. INPUT LEVEL

Bal. +23.5dB

Unbal. +18dB

MAX. OUTPUT LEVEL

Bal. +22.5dB(Any output)

Unbal. +17.5dB into 600.

OUTPUT IMPEDANCE33 (electronically balanced)

NOISE

Better than -95 dB(Gain=0dB, Bandwidth 22Hz - 22kHz)

CROSSTALK

Better than -90dB @ 10kHz(Input grounded, any channel output)

DISTORTION@ 1kHzBANDWIDTH

Output0dB better than 0.008%+10dB better than 0.008%+20dB better than 0.015%
18Hz to 32kHz -1dB

HEADPHONE AMPLIFIER Will deliver 1 Watt into 8
Recommended Headphone Impedance 8 to 600
TRANSFORMER OPTION
Outputs fitted with specified transformer will have the following specification:Max. Input Level @ 40 Hz+6dB for 0.5% THD.

Distortion @ 1 KHz

0 dB Output better than 0.008%

Bandwidth 10 K Load
Insertion Loss

20 Hz - 45 KHz
0.10dB (with 10 K load)

Bandwidth 600  Load
Insertion Loss

20 Hz - 33 KHz
0.67dB (with 600  load)

DCR Winding 1
DCR Winding 2

6.9  + 7.6 
11.6 

POWER REQUIREMENTS

115Volt or 230Volt at 50-60Hz, 30 Watts

FUSE RATING

160mA for 230Volt, 315mA for 115Volt
CONFORMING TO IEC127-2

FUSE TYPE

20mm x 5mm, Class 3 Slo-Blo, 250Volt Working

CASE SIZE

482mm (w) x 44mm (h) x 200mm (d)WEIGHT (incl packaging)

4.05 Kgs. (With all Transformers fitted 4.60 Kgs.)



DA6 OPERATORS’ MANUALBLOCK DIAGRAM