Dynaudio Speaker BM 5A User Manual

BM 5A  
Users manual  
The lightning flash with an arrowhead  
symbol within an equilateral triangle, is  
intended to alert the user to the  
The exclamation point within an  
equilateral triangle is intended to alert  
the user to the presence of important  
operating and maintenance (servicing)  
instructions in the literature accompanying the  
presence of uninsulated "dangerous volt-  
age" within the product's enclosure that may be of  
sufficient magnitude to constitute a risk of  
electric shock to persons.  
Read these instructions.  
Keep these instructions.  
Heed all warnings.  
Follow all instructions.  
Do not use this apparatus near water.  
Clean only with dry cloth.  
Install in accordance with the manufacturer's  
Do not install near any heat sources such  
as radiators, heat registers, stoves, or other  
apparatus (including amplifiers) that produce  
Do not defeat the safety purpose of the  
polarized or grounding-type plug. A  
polarized plug has two blades with one  
wider than the other. A grounding type plug  
has two blades and a third grounding prong.  
The wide blade or the third prong are provided  
for your safety. If the provided plug does not fit  
into your outlet, consult an electrician for  
replacement of the obsolete outlet.  
To reduce the risk of fire or electrical shock,  
do not expose this equipment to dripping or  
splashing and ensure that no objects filled  
with liquids, such as vases, are placed on the  
This apparatus must be earthed.  
Use a three wire grounding type line cord  
like the one supplied with the product.  
Be advised that different operating voltages  
require the use of different types of line  
cord and attachment plugs.  
Always observe the local safaty regulations.  
Ensure that the factory-set power  
requirements for the device (refer to the label  
on the back of the monitor) corresponds to the  
mains supply in your region.  
This equipment should be installed near the  
socket outlet and disconnection of the device  
should be easily accessible.  
To completely disconnect from AC mains,  
disconnect the power supply cord from the AC  
10 Protect the power cord from being walked  
on or pinched particularly at plugs,  
convenience receptacles, and the point  
where they exit from the apparatus.  
11 Only use attachments/accessories specified  
by the manufacturer.  
The mains plug of the power supply shall  
remain readily operable.  
Use only with the cart, stand, tripod,  
bracket, or table specified by the  
manufacturer, or sold with the  
Do not install in a confined space.  
Do not open the unit - risk of electric shock  
apparatus. When a cart is used, use  
caution when moving the cart/apparatus  
combination to avoid injury from tip-over.  
You are cautioned that any change or  
modifications not expressly approved in this  
manual could void your authority to operate this  
13 Unplug this apparatus during lightning storms  
or when unused for long periods of time.  
14 Refer all servicing to qualified service  
personnel. Servicing is required when the  
apparatus has been damaged in any way,  
such as power-supply cord or plug is  
damaged, liquid has been spilled or objects  
have fallen into the apparatus, the  
There are no user-serviceable parts inside.  
All service must be performed by qualified  
apparatus has been exposed to rain or  
moisture, does not operate normally, or has  
been dropped.  
Important Safety Instructions &  
Certificate of conformity . . . . . . . . . . .a  
Table of Contents . . . . . . . . . . . . . . . .3  
Introduction . . . . . . . . . . . . . . . . . . . . .4  
Rear Panel - Overview . . . . . . . . . . . .5  
Setting Up . . . . . . . . . . . . . . . . . . . . .6  
Indicators . . . . . . . . . . . . . . . . . . . . . .7  
Positioning . . . . . . . . . . . . . . . . . . . . .7  
Troubleshooting . . . . . . . . . . . . . . . . .8  
Care . . . . . . . . . . . . . . . . . . . . . . . . . .8  
Options . . . . . . . . . . . . . . . . . . . . . . . .8  
Service . . . . . . . . . . . . . . . . . . . . . . . .8  
Technical specificatinos . . . . . . . . . . . .9  
TC Electronic, Sindalsvej 34, DK-8240 Risskov – [email protected] English Version  
Rev 1.00  
Prod. No: 606111021  
Congratulations on your purchase of the Dynaudio Acoustics BM 5A active  
monitor system. With the right care and attention it will provide many years of  
excellent and trouble free audio reproduction. It is most important, however, that  
you take a few minutes at this early stage of your BM 5A’s life, to read this manual.  
It contains essential information to make you get the best from your new monitors.  
Break-In time  
The transducers of your BM 5A monitor will achieve better sound quality after  
breaking in. Especially after the first hours of use, you may notice a significant  
advance in sound quality. Still after first few hours improvement take place, but  
lesser noticeable.  
The latest manual revision is always available at our website:  
Please enjoy  
Correct setup and connections is essential to achieve optimal performance from your  
monitors. Please follow the instructions on the following pages.  
5. Level trim  
1. AC power Input and fuse  
2. Power On/Off switch  
3. Balanced analog Input  
4. High Pass filter switch  
6. LF - Low filter setting  
7. MF - Mid filter setting  
8. HF - Hi filter setting  
1/2. Power On/Off switch/AC Power In  
5. Level trim  
Before switching on, make sure Mains Voltage  
matches your areas Mains Voltage specification.  
Replace fuse only with the fuse-type marked on  
the rear-panel label.  
Use this switch to match the sensitivity of the  
BM 5A monitor to your source.  
High-output source  
If your source has a high Output, set the switch  
to the -10 position to reduce the sensitivity by  
3. Balanced analog Input  
Audio Input is via a female XLR connector. The  
Input is electronically balanced with following  
connections. The connections are printed on  
the rear for easy reference.  
Low-output source  
If your source has low output, set to +4 position  
to gain 4dB more sensitivity.  
6. LF  
This switch controls the bass gain level using  
shelf-type EQ. The level can be set to +2dB,  
0dB or -2dB.  
This filter is used to adjust for the proximity of  
boundaries, so if positioned close to wall or  
corner, use the -2dB setting. If positioned far  
from walls use the +2dB or 0 position,  
depending on other equipment, and personal  
7. MF  
If your signal source is unbalanced, usually the  
unused pin is connected to ground. This is  
normally done inside the connecting cable.  
Special adaptors (not supplied) can be bought  
that converts xlr input to single ended RCA type  
input. For best result use only good quality  
screened cables and connectors.  
This switch sets a notch filter, used to  
compensate for the acoustic effect of a console.  
Such placement usually results in a response  
peak in lower midrange. The MF switch  
activates a bell shaped notch filter, which can  
compensate. Use either the -2 or the -4dB  
setting. You may experiment finding the setting,  
which provides the flattest response.  
On the rear of the monitor you will find 5  
switches for setting up the monitor for optimum  
performance in different acoustic environments.  
Each switch is explained in the following.  
8. HF  
This switch controls the Treble level and it is  
used to match the high end of the monitor to  
your other electronic equipment, and your  
acoustical environment. Use the setting  
providing the preferred timbre. If the sound is  
too bright; try to set to -1dB to reduce treble by  
1dB. If too dull sound, use +1dB setting to raise  
the treble by 1dB.  
4. High Pass filter switch  
This switch sets the lower cut-off frequency of  
the monitor. It is used to match the monitor to a  
subwoofer. You can select between 60Hz or  
80Hz X-over. Flat is used in case you do not  
use a subwoofer to assist your monitors. When  
used with a subwoofer it is recommended to  
use either 60Hz or 80Hz filter, thus allowing a  
higher undistorted soundpressure level.  
The woofer channel has a built in limiter that  
On the front you will find 2 diodes. These are  
positioned just above the Dynaudio Logo.  
protects the woofer unit from too much  
excursion. It works by reducing the gain of the  
circuit when a certain threshold level is  
The BM 5A is designed as a near to mid-field  
monitor and can be equally well used in both  
stereo and surround setups. Optimal  
performance is achieved when positioned 1-3  
meters from the listener.  
It can be placed on stands or on the meter  
bridge of a console provided that the meter  
bridge is sufficiently sturdy. For best results the  
speakers may be aimed towards the listener in  
both vertical and horizontal planes.  
Be aware that proper air circulation around the  
monitor for sufficient cooling is necessary. Also  
notice that the heat sink is designed to provide  
maximum cooling when the monitor is  
positioned vertically.  
The green power diode indicates speaker  
on/off status. Green indicates; “power on”.  
The second diode has two functions. This  
will light up orange when the input signal  
reaches a level where the limiter is activated to  
prevent the internal bass amplifier from  
clipping. And it will light up red when the  
amplifier gets too hot. At the same time the  
monitor will be muted, in order to reduce the  
The BM 5A monitor has several built in  
protection systems to reduce the risk of hazard  
or damage due to overloading.  
Both power amplifiers have thermal protection.  
This activates if a problem should occur, and  
helps protect both the electronics and the  
loudspeaker drivers.  
There is also a thermal sensor measuring the  
temperature on the heat sink. An electronic  
circuit will mute the signal when too high  
temperature is reached. The protection diode  
on the front will light up when this happens.  
On the tweeter output there is an overload  
protection to prevent burning the tweeter driver  
in case of overloading. This circuit will mute the  
tweeter signal if too much current is fed to the  
If Power LED lights green and no sound, check  
your input signal f.ex. by switching speakers.  
There are no user serviceable parts inside the  
monitor. If service is required please contact  
service via:  
If power LED does not light at all and no sound,  
check the fuse. If replaced and still no sound  
contact your Dynaudio Acoustics Dealer.  
If protection LED lights red check the  
TC Electronic  
Sindalsvej 34  
DK-8240 Risskov  
temperature of the heat sink. If it feels hot turn  
off the speaker and wait for some 10 minutes to  
allow the amplifier to cool off. Turn it on again.  
If it works now it is ok, but you may need more  
air circulation around your speaker to avoid  
overheating to take place again.  
Tel: +45 87427000  
Components of the highest quality is used in  
your BM 5A. This assures years of trouble free  
operation. Following precautions should still be  
made though.  
Avoid running the system into severe clipping.  
Even there is an advanced protection system,  
you may be able to destroy your speakers by  
severe overpowering. The limiter works over a  
certain range, but exceeding this level may  
send a severely clipped signal to your drivers.  
When a noticeable distortion occurs, please  
turn down the level to your speakers.  
Avoid hot plugging the equipment connected to  
the monitors. Always turn off the speaker and  
other equipment when plugging or unplugging  
signals, or switching equipment on or off.  
Do not touch the drive units by hand. The  
tweeter especially uses a very fine fabric dome  
with a ultra thin coating.  
The BM 5A may be combined with a Dynaudio  
Acoustics subwoofer for extended bass  
performance, and higher spl if highpass filter is  
used. See Setting Up.  
Two-way Active Nearfield Monitor  
Frequency Response (+/- 3 dB)  
Input level for 85 dB SPL @1m  
Power consumption  
Amplifier power  
50 Hz - 21 kHz  
-16dBu RMS @ 0dB setting  
Idle: 10 W / Max: 90 W  
Tweeter: 50 W / Woofer: 50 W  
Bass reflex  
Bass Principle  
Vent tuning frequency  
Internal Cabinet Volume  
Crossover Frequency  
Crossover Slope  
55 Hz  
9 liters  
1500 Hz  
6 dB/oct  
Esotec 28 mm/1.1" soft dome, rear chamber,  
Magnetic fluid. 4 mm alu front, pure alu wire  
voice coil  
170 mm/6.5", One-piece thermo formed poly-  
prop cone, 75 mm/3" pure alu voice coil  
8.7 kg / 19.2 lbs  
Dimensions (W x H x D)  
186 x 320 x 320 mm / 7.3" x 12.5" x 12.5"  

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