User manual DYNAUDIO BM 15A

[. . . ] 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. To prevent possibility of shock hazard do not expose the unit to moisture There are no user serviceable parts inside. Refer servicing to qualified personnel only Ensure correct mains voltage and fuse are selected before connection to mains Setting Up Mains Power Connections Mains power is applied via a fused IEC inlet. [. . . ] 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 HF Trim circuit is a low-Q equaliser which reaches a maximum range of 6dB @ 15kHz (see graph). LF Trim. 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. 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. [. . . ] 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: SPL (Peak/Cont. ): Drive units: Internal amplifiers: 2 way active near/midfield monitor 119dB / 109dB one cabinet @ 1m. 240 mm bass driver, 26 mm high frequency driver 200W + 100W discrete MOSFET power amps. Instrumentation type balanced input section, with input overload protection. [. . . ]