Dynaudio BM 6A mkII Bedienungsanleitung

DA-BM6A

OWNERS MANUAL

Congratulations on your purchase of the Dynaudio Acoustics BM6A monitor system. With the

right care and attention it will give you many years of trouble free audio reproduction. It is

most important, however, that you take a few minutes at this early stage in your BM6A’s life to

read the following paragraphs. They contain essential information to enable you to get the

best from your monitors.

Electrical Safety Warning

This unit is supplied with a 3 wire power cord. Under no circumstances should the

earth wire be disconnected.

To prevent possibility of shock hazard do not expose the unit to moisture

There are no user serviceable parts inside. Do not open cover. Refer servicing to

qualified personnel only

Ensure correct mains voltage and fuse are selected before connection to mains

BM6A Owner’s Manual - Issue 2 Page 2

November 1997

Setting Up

Mains Power Connections

Mains power is applied via a fused IEC inlet. The unit must be earthed. The voltage selector

switch is used to match the unit to the mains voltage in your territory. The mains fuse must be

the correct value for the voltage selected, 115V requires a T3.15A fuse while 230V requires a

T1.6A fuse. The ‘T’ signifies a slow blow type fuse.

You must ensure that the correct voltage and fuse have been selected before

switching the unit on.

Audio Connections

Audio input is via a female XLR connector. The input is electronically balanced with +ve on

pin 2, -ve on pin 3 and ground on pin 1. If your signal source is unbalanced it is usual to

connect the unused signal pin (i.e. Pin 3) to ground. This is normally done inside the

connecting cable. For best results use only good quality screened cables and connectors.

Your local dealer will be able to advise you

Positioning

The BM6A is designed primarily as a ‘nearfield’ monitor and would normally be positioned

1-3m from the listener. They can be mounted on stands or on the meter bridge of the console

(providing this is substantial enough). For best results the speakers should be ‘aimed’ at the

listener in both vertical and horizontal planes.

In any situation ensure that there is adequate space for ventilation around the heatsink.

BM6A Owner’s Manual - Issue 2 Page 3

November 1997

Operation

Controls

Level switch. This sets the input sensitivity of the unit. The +4 position is intended for

professional use and means that full power is reached with an input level of

+4dBm (balanced). The -10 position is intended for semi-professional or

domestic use and means that full power is reached with an input level of

-10dBm (unbalanced).

HF Trim. This control allows the high frequency level to be adjusted. The control

works from 3kHz upwards and has a range of 5dB (see figure 1).

LF Trim. This control allows the low frequency level to be adjusted. The control works

from 100Hz downwards and has a range of 5dB (see figure 1). This section

uses a special equaliser design which effectively swaps bandwidth for power.

As you turn the LF trim level down the low frequency extension is improved.

The trim controls are intended to allow the user to make some adjustment of the speaker

response to accommodate personal tastes and variations in acoustic environment.

Figure 1 - Trim Control Response

Indicators

There are two LED indicators on the front baffle of the BM6A.

The right hand one is the power/fault indicator. On switching the unit on this will shine red for

about ten seconds and then turn green to indicate normal operation. If for any reason the

amplifier protection circuitry is engaged the LED will turn back to red.

The left indicator is a true clip indicator and lights when the low frequency amplifier clips. It is

acceptable to run the system with this lighting occasionally but avoid running the system with

this lighting most of the time

Running In

BM6A Owner’s Manual - Issue 2 Page 4

November 1997

The drivers in your BM6A must be run in before optimum performance is achieved. Avoid

using the system at high levels for the first 24 hours of operation. Full run in is usually

achieved after about one week of normal operation.

Protection

The BM6A has a comprehensive electronic protection system. Thermal overload and dc

voltage on the outputs will cause the system to engage. This will disconnect the drive units

from the amplifier and change the power LED to it’s red/fault condition. In addition the HF

amplifier has an optical limiter in circuit which prevents excessive long term power reaching

the tweeter whilst allowing transients to pass uncompressed.

Troubleshooting

If the speaker stops working and the power LED turns red (fault condition) switch the unit off

and leave it for a while. If the unit works again when you switch back on the fault was

probably due to thermal overload, ensure the heatsink is clear of obstruction and has free air

circulation around it. If however the fault condition persists the unit should be inspected by

qualified personnel (your DA dealer).

If the speaker stops working and no LED’s are alight then the mains fuse on the back panel

should be checked and replaced if necessary. If this does not rectify the problem the unit

should be inspected by qualified personnel (your DA dealer).

Care

Components of the highest quality are used in the BM6 A. and should give a long trouble free

life. Here are a few hints to help them on their way.

Avoid running the system into clipping or distortion. When an amplifier clips it can send

potentially damaging DC components to the drive units. They may not fail at once but

prolonged exposure to this will result in eventual failure.

Avoid unplugging or switching off any equipment that is connected to the monitor system

without first turning off the BM6A. Large voltage spikes are often generated when equipment

is switched off which will be amplified to a potentially damaging level.

Do not touch the drive units. The tweeter especially uses a very fine fabric diaphragm which

is easily damaged.

Options

BM6A Owner’s Manual - Issue 2 Page 5

November 1997

The BM6 A may be used in conjunction with the Dynaudio Acoustics Active Bass Extension

System. The ABES comprises a single 2 x 12" Bass cabinet, with an integrated crossover and

amplifier mounted on the rear. The ABES will extend the frequency response of the BM6 A

down to 35Hz. Please consult your local dealer for a demonstration.

Service

There are no user serviceable parts inside the BM6A so consult your dealer if service is

required or contact one of the addresses below.

Dynaudio Acoustics A/S

Sverigesvej 15

DK-8660 Skanderborg

Denmark

Tel: +45 86 52 34 11

Fax: +45 86 52 31 16

Dynaudio Acoustics (UK) Ltd.

Unit 21, Riverside Workshops

28 Park Street, London

SE1 9EQ. UK.

Tel: +44 171 403 3808

Fax: +44 171 403 0957

Warranty

This product is guaranteed against defects in materials and workmanship for 1 year from date

of purchase. This warranty is void if the unit has been tampered with or modified in any way,

or in our opinion has not been used in accordance with the instructions above.

BM6A Owner’s Manual - Issue 2 Page 6

November 1997

Technical Specifications

Type: 2 way active nearfield monitor

Frequency Response: 42 Hz to 21 kHz (+/- 2.5dB).

SPL (Peak/Cont.): 116dB / 101dB one cabinet @ 1m.

Drive units: 170 mm bass driver, 26 mm high frequency driver

Internal amplifiers: Dual 100W discrete MOSFET power amps.

Convection cooled.

2.2 kHz electronic crossover, 4th order phase aligned.

Instrumentation type balanced input section, with input overload

protection.

Protection: DC, Thermal on both channels, photo-active limiter on HF

User Controls: Variable HF and LF trim, Input sensitivity

Dimensions: 338 x 216 x 285 millimetres (h x w x d)

(Allow 35 mm for rear connectors clearance)

Positioning: Free standing near field, desktop mounting.

Rigid high performance stands recommended.

Accessories: Power cable supplied.

Schematic Diagram

Mid range eq

HF trim control

order

crossover

HF limiter

LF Equalisation

Driver

protection

Instrumentation type

electronically balanced

input stage

100W Hexfet Amplifier

100W Hexfet amplifier

DA D260

DA 17W75

Clip indicator

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