Dynaudio DA BM15A User Manual

DA-BM15A  
OWNERS MANUAL  
Congratulations on your purchase of the Dynaudio Acoustics BM15A 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 BM15A’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  
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  
LF Trim.  
This control allows the high frequency level to be adjusted. The HF Trim  
circuit is a low-Q equaliser which reaches a maximum range of 6dB @ 15kHz  
(see graph).  
This control allows the low frequency level to be adjusted. The LF Trim circuit  
is a low-Q equaliser which reaches a maximum range of 6dB @ 50Hz (see  
graph).  
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.  
Trim Control Response  
Indicators  
There are two LED indicators on the front baffle of the BM15A.  
The right hand one is the power/fault indicator. On switching the unit on this will shine red for  
about five 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.  
BM15A Owner’s Manual - Issue 2  
November 1997  
Page 3  
The left indicator is a 'true-clip' indicator and lights if the low frequency amplifier clips, or runs  
into overload. It is acceptable to run the system with this lighting occasionally on peaks, but  
avoid running the system with it lighting most of the time  
Running-In  
The drivers in your BM15A 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 BM15A has a comprehensive electronic protection system. Thermal overload or dc  
voltage on the outputs will cause the system to engage. This will disconnect the drive units  
from the amplifiers 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 mains  
power off and leave it for a moment. If the unit fails to operate again when you switch back on  
the fault may be due to overheating, switch off again and allow it to fully cool down before  
powering up. 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 BM15A. and should give a long trouble free  
life. Here are a few hints to help them on their way.  
Avoid running the system into more than very brief clipping or distortion. When an amplifier  
clips it can send potentially damaging d.c. 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 BM15A. 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  
BM15A Owner’s Manual - Issue 2  
November 1997  
Page 4  
The BM15A 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  
BM15A down to 35Hz. Please consult your local dealer for a demonstration.  
Service  
There are no user serviceable parts inside the BM15A 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  
BM15A Owner’s Manual - Issue 2  
November 1997  
Page 5  
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.  
Technical Specifications  
Type:  
2 way active near/midfield monitor  
Frequency Response: 40 Hz to 22 kHz (-3dB).  
SPL (Peak/Cont.):  
Drive units:  
119dB / 109dB one cabinet @ 1m.  
240 mm bass driver, 26 mm high frequency driver  
200W + 100W discrete MOSFET power amps.  
Convection cooled.  
Internal amplifiers:  
1.7 kHz electronic crossover, 5th order phase aligned.  
Instrumentation type balanced input section, with input overload  
protection.  
Protection:  
DC, Thermal on both channels, opto-electronic limiter on HF  
Variable HF and LF trim, Input sensitivity  
455 x 290 x 387 millimetres (h x w x d)  
User Controls:  
Dimensions:  
(Allow 35 mm for rear connectors clearance)  
Free standing near/mid-field, desktop mounting.  
Rigid high performance stands recommended.  
Power cable supplied.  
Positioning:  
Accessories:  
Schematic Diagram  
100W Hexfet Amplifier  
HF limiter  
Instrumentation type  
electronically balanced  
input stage  
DA D260  
Fixed eq  
LF and HF trim  
5th order  
crossover  
Driver  
protection  
DA 24W100  
Clip indicator  
200W Hexfet amplifier  
BM15A Owner’s Manual - Issue 2  
November 1997  
Page 6  

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