Drawmer DA6 User Manual

DA 6

DISTRIBUTION AMP

OPERATORS MANUAL

CONTENTS

SAFETY CONSIDERATIONS page 1
INTRODUCTION page 2
INSTALLATION page 2
HEADPHONES pages 1, 4
ISOLATING TRANSFORMERS page 3
CONTROL DESCRIPTIONS page 6
IF A FAULT DEVELOPS page 8
CONTACTING DRAWMER page 8
TECHNICAL SPECIFICATION page 9
BLOCK DIAGRAM page 10

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COPYRIGHT

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This manual is copyrighted © 2002 by Drawmer Electronics, Ltd. With all rights
reserved. Under cop

ht laws, this manual may not be duplicated in whole or in

part without the written consent of Drawmer.

ONE YEAR LIMITED WARRANTY

Drawmer Electronics Ltd., warrants the Drawmer DA6 audio processor to conform
substantiall

inal date of purchase when used in accordance with the specifications detailed

ori
in this manual. In the case of a valid warrant
remed
Drawmer’s discretion, repair or replace the product without char
possible, to refund the purchase price to
applies onl

to the specifications of this manual for a period of one year from the

claim, your sole and exclusive

and Drawmer’s entire liability under any theory of liability will be to, at

e, or, if not

ou. This warranty is not transferable. It

to the original purchaser of the product.

For warrant

service please call your local Drawmer dealer. Alternatively call
Drawmer Electronics Ltd. at [phone]. Then ship the defective product,
with transportation and insurance char
Coleman Street, Park

ate, Rotherham, S62 6EL UK. Write the RA number in large
letters in a prominent position on the shippin
telephone number, cop

of the original sales invoice and a detailed description of

the problem. Drawmer will not accept responsibilit

es pre-paid, to Drawmer Electronics Ltd.,

box. Enclose your name, address,

for loss or damage durin

transit.
This warrant

is void if the product has been damaged by misuse, modification or

unauthorised repair.
THIS WARRANTY IS IN LIEU OF ALL WARRANTIES, WHETHER ORAL OR

WRITTEN, EXPRESSED, IMPLIED OR STATUTORY. DRAWMER MAKES NO
OTHER WARRANTY EITHER EXPRESS OR IMPLIED, INCLUDING, WITHOUT
LIMITATION, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. PURCHASER’S
SOLE AND EXCLUSIVE REMEDY UNDER THIS WARRANTY SHALL BE REPAIR
OR REPLACEMENT AS SPECIFIED HEREIN.

IN NO EVENT WILL DRAWMER ELECTRONICS LTD. BE LIABLE FOR ANY
DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES
RESULTING FROM ANY DEFECT IN THE PRODUCT, INCLUDING LOST
PROFITS, 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 lon

not apply to you. This warranty gives you specific legal rights. You may have

ma
additional ri

hts that vary from state to state, and country to country.

In the interests of product development, Drawmer reserve the ri
improve specifications of this product at an

an implied warranty may last, so the above limitations

ht to modify or

time, without prior notice.

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DA6 OPERATORS’ MANUAL

DRAWMER DA6

Distribution Amp

SAFETY CONSIDERATIONS

CAUTION - MAINS FUSE

TO REDUCE THE RISK OF FIRE REPLACE THE MAINS FUSE ONLY WITH

THE SAME TYPE, WHICH MUST BE A CLASS 3, 230 VOLT, TIME DELAY

TYPE, RATED AT 160mA WHERE THE MAINS INPUT VOLTAGE SWITCH IS

SET TO 230 VOLTS AC. AND 315mA WHERE THE MAINS INPUT VOLTAGE

IS 115 VOLTS AC.

ALL FUSES MUST COMPLY WITH IEC 127-2.

THE FUSE BODY SIZE IS 20mm x 5mm.

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CAUTION - MAINS CABLE

DO NOT ATTEMPT TO CHANGE OR TAMPER WITH THE SUPPLIED MAINS

CABLE.

CAUTION - SERVICING

DO NOT PERFORM ANY SERVICING. REFER ALL SERVICING TO

QUALIFIED SERVICE PERSONNEL.

WARNING

TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE

THIS EQUIPMENT TO RAIN OR MOISTURE.

CAUTION - HEADPHONES

THE HEADPHONE AMPLIFIER IN THIS UNIT IS CAPABLE OF PRODUCING

1 WATT INTO 8 SPEAKERS. DRAWMER DO NOT ACCEPT ANY

RESPONSIBILITY FOR DAMAGE CAUSED TO OPERATOR HEARING OR

SPEAKER DEVICES BY USE OF EXCESSIVE OUTPUT LEVELS.

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DA6 OPERATORS’ MANUAL

INTRODUCTION

The distribution of mono and stereo balanced audio signals from a single source to
multiple destinations has man
installation; live sports events covera
houses or where hi

cable runs.

lon
The Drawmer DA6 is a six channel stereo output ( or twelve mono ) distribution amplifier

featurin
for instanced where electrical isolation of remote equipment is required.

XLR balanced connections. Optional transformer balanced outputs are offered

h quality audio has to be distributed to a number of locations down

applications, including: multi-zone sound reinforcement

e; broadcast studios; video suites; duplication

The electronicall
LED bar

nals. Each of the six output pairs incorporate further left/right level controls and a

si
Mono/Stereo switch which will mix two stereo si
to both stereo outputs.

The monitor section consists of a channel select so that the individual left/ri
level of each channel can is displa
simultaneousl

An auxiliar
where even more distribution is required. These outputs are post input
ma

raph metering enabling the correct balancing of stereo material or two mono

pair of balanced output jacks provide a facility to connect further DA6 units

be fitted with optional output isolating transformers.

balanced stereo input features individual left/right level controls with

nals, or, connect a single mono signal

ht output

ed on the output LED bargraph and can be

heard at the front-panel headphone jack.

ain trim, and

INSTALLATION

The DA6 is designed for standard 19" rack mounting and occupies 1U of rack space.
Avoid mountin

nificant amounts of heat. Always connect the mains earth to the unit. Use fibre or

si
plastic washers to prevent the front panel becomin

the unit directly above power amplifiers or power supplies that radiate

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 wirin

Pin 1 Ground; pin 2 Hot; and pin 3 Cold.

For use with unbalanced s
output inside the XLR connectors.

The Stereo Aux. Outputs are balanced ¼" (TRS) jack sockets, where Tip connection is
Hot; Rin
multiple DA6 units if there is a requirement for more than 6 stereo outputs. For use with
unbalanced s
terminal inside the Jack plu

is Cold; and Sleeve is Ground. These connections are offered for chainin

stems, use mono jack plugs, or connect the Ring (Cold) to the Sleeve

stems, the Cold pin 3 must be grounded at both input and

s.

convention being:

DA6 OPERATORS’ MANUAL

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Interference: 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

est that the unit be operated using an optional wiring of the

su
balanced confi

uration. The screens of the signal cables should be
connected to the chassis connection on the XLR connector as
opposed to connectin
The DA6 full

Ground Loops: If

mains earth, but instead, tr
one end of each of the cables connectin
If such measures are necessar

conforms to the EMC standards.

round loop problems are encountered, never disconnect the

to pin1.

disconnecting the signal screen on

the DA6 to the patchbay.

, balanced operation is

recommended.

ISOLATION TRANSFORMERS

The DA6 has the capability of being isolated at its outputs using low impedance (600)
balanced transformers. Each output can be individuall
have mixed confi
electronicall

balanced. Isolating transformers can be factory fitted, or alternatively,

retro fitted b

urations where some outputs retain their default connection of

a Drawmer appointed service agent, or a suitably qualified engineer.

Contact Drawmer for specifications.

isolated, and it is possible to

warranty will be void if isolating transformers are fitted by non-approved

An
methods, or, if unspecified transformers are fitted.

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DA6 OPERATORS’ MANUAL

MONITOR HEADPHONES

For the purposes of monitoring each output, a stereo ¼" (TRS) jack socket is offered on
the front panel. This havin

ht; 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 approximatel
1Watt. Caution is required when operating at high output levels with low impedance
headphones.

the standard wiring convention of Tip being Left; Ring bein

DRAWMER do NOT accept an
operator hearin

or speaker devices by use of excessive output levels.

responsibility for damage caused to

POWER CONNECTION

The DA6 unit will be supplied with a power cable suitable for domestic power outlets in

our country. For your own safety, it is important that you use this cable to connect to

the mains suppl
The power suppl

spare) both of the same value, to suit the mains volta
supplied. Removal of the drawer is onl
should never blow under normal operation. If the fuse is suspected of havin
then a fault will have occurred and this fault condition should be inspected b
service en

If the unit is to be used with a mains input operatin
the unit is supplied, the followin
competent person,

1: Disconnect the unit from the mains.

earth. The cable must not be tampered with or modified.

socket has an integral fuse drawer containing the power fuse (and a

e for which the unit has been

possible with the power cord removed. The fuse

blown,

a qualified

ineer. When replacing the fuse, always comply with the Safety Instructions.

voltage different to that for which

procedure must be carried out by a technicall

(see following diagrams)

2: Usin

-tappin
each side; two along the top edge at the rear; and the upper central screw
on the front facia panel.

3: Slide the volta

mains input volta

a number 1 size pozidrive screwdriver, remove the seven self

screws that retain the top cover. Two screws are found alon

e change-over switch (SW8) until the correct (or nearest)

e is visible on the switch actuator.

DA6 OPERATORS’ MANUAL

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For conversion to 115Volt AC (previously set to 230Volt AC).....

4a Exchan

e the 160mA fuse for a similar type rated at 315mA.



For conversion to 230Volt AC (previousl

4b Exchan

e the 315mA fuse for a similar type rated at 160mA.

set to 115Volt AC).....

In both cases:

5: Replace the top cover usin

the seven screws.

6: Re-connect to mains power source.

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DA6 OPERATORS’ MANUAL

CONTROL DESCRIPTION

The DA6 has been designed for ease of use. It operates on balanced or unbalanced

nal levels in the range -15dB to +15dB.(ref. +4dBm)

si

Input L&R Used to set the optimal input

Use the displa

attained. Adjustment in the range ±15dB is possible.

bein
Separate controls are offered to permit the re-ali
offset stereo image.

These controls also adjust the output level of the auxiliar
jacks, which implies that an
to have its input trims set to 0dB (verticall

Input Displa

Output L&R These controls should be used to set the optimal output level to

Since the DA6 is normally used as a line amplifier, then it is quite
acceptable to ‘see’ si
displa
other than for brief instances, otherwise distortion will occur.

match the input section of the connected device, for both Left and
Ri
stereo image offset will have been corrected by the Left/Right input
controls. However separate output controls are also offered to
total control of the stereo ima

. However, ensure that the +15dB LED never illuminates

ht signals. Adjustment of ±15dB is possible. Normally, an

above to ensure the correct operating levels are

nals in the positive gain region of this

ain for both Left and Right signals.

nment of an

‘link’

connected slave DA6 will only require

).

ive

e.

Mono/Stereo Selects whether the channel output is to be separate Stereo

signals or ‘summed’ to produce a Mono signal. If only one input is
used, this will be output to both sockets if Mono is selected.

Caution should be used when operatin
stereo si
conditions, usin
output. LEDs show the status of the switch.

nals that are out-of-phase with each other. Under such

the Mono mode will produce very little usable

the DA6 with two similar

DA6 OPERATORS’ MANUAL

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Chan Select This rotary switch selects which stereo (or mono) output is to be

routed throu

h to the stereo headphone amplifier.

H/Phone This control determines the amount of headphone amplifier drive.

Caution should be used when using high output levels and low
impedance headphones.

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Output Displa

This display shows the stereo output levels of the selected channel
feed to headphones, removin
a method of monitorin

the need to utilise headphones as

the output signals.

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DA6 OPERATORS’ MANUAL

IF A FAULT DEVELOPS

For warranty service please call Drawmer Electronics Ltd. Or their nearest authorised
service facilit
or shippin
under the warrant
representative.

, giving full details of the difficulty. On receipt of this information, service

instructions will be forwarded to you. No equipment should be returned

without prior consent from Drawmer or their authorised

For service claims under the warrant
number will be
the shippin
sales invoice and a detailed description of the problem.

Authorised returns should be prepaid and must be insured. All Drawmer products are
packa
the ori
should be packa
handlin

ed in specially designed containers for protection. If the unit is to be returned,

inal container must be used. If this container is not available, then the equipment

for the transit.

iven. Write this RA number in large letters in a prominent position on

box. Enclose your name, address, telephone number, copy of the original

ed in substantial shock-proof material, capable of withstanding the

reement a service Returns Authorisation (RA)

CONTACTING DRAWMER

Drawmer Electronics Ltd., will be pleased to answer all application questions to enhance

our usage of this equipment. Please address correspondence to:

Drawmer (Technical Help line) : Coleman St.: Park

or, E-mail us on : [e-mail]

Drawmer dealers, Authorised service departments and other contact information can be
obtained from our web pa

es on http://www.drawmer.com

ate : Rotherham : S62 6EL : UK

DA6 OPERATORS’ MANUAL

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TECHNICAL SPECIFICATIONS

All Levels ref.+4dBm

INPUT IMPEDANCE 15K
MAX. INPUT LEVEL Bal. +23.5dB Unbal. +18dB
MAX. OUTPUT LEVEL Bal. +22.5dB Unbal. +17.5dB into 600 .

(An

output)

OUTPUT IMPEDANCE 33 (electronically balanced)
NOISE Better than -95 dB

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

CROSSTALK Better than -90dB @ 10kHz

(Input

DISTORTION @ 1kHz Output 0dB better than 0.008%

BANDWIDTH 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 followin

rounded, any channel output)

+10dB better than 0.008%
+20dB better than 0.015%

specification:-

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Max. Input Level @ 40 Hz +6dB for 0.5% THD.
Distortion @ 1 KHz 0 dB Output better than 0.008%
Bandwidth 10 K Load 20 Hz - 45 KHz

Insertion Loss 0.10dB (with 10 K load)
Bandwidth 600  Load 20 Hz - 33 KHz

Insertion Loss 0.67dB (with 600  load)
DCR Windin

DCR Windin

16.9  + 7.6 
2 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 Workin
CASE SIZE 482mm (w) x 44mm (h) x 200mm (d)
WEIGHT (incl packaging) 4.05 Kgs. (With all Transformers fitted 4.60 Kgs.)

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DA6 OPERATORS’ MANUAL

BLOCK DIAGRAM