User manual DYNACORD PM2600

[. . . ] The minimum distance between parts carrying mains voltage and any switches or breakers that are not connected to the mains (secondary parts) has to be 6 mm and needs to be minded at all times. Replacing special components that are marked in the circuit diagram using the security symbol (Note) is only permissible when using original parts. Altering the circuitry without prior consent or advice is not legitimate. Any work security regulations that are applicable at the location where the appliance is being serviced have to be strictly obeyed. [. . . ] This ensures that, when setting up the sound system, the audio signal can be optically monitored at the power amplifier, without the need to reproduce the sound through the loudspeaker systems. output Signal Indicators For The LO/HI Channels A , B These LEDs indicate the output voltage of the power amplifiers. The LO-indicators represent the output voltage of the bass power amplifiers while the HI-indicators represent the output voltage of the MID-HI power amplifiers. The LEDs are directly fed from the output connectors which additionally provides optical information of short-circuits in loudspeaker lines. Whenever a faulty condition like a short-circuit occurs and even though the audio signal is reproduced, the corresponding indicator does not light at all or is dimmed. LIMIT The limit indicators light whenever the internal limiter is activated and the power amplifier is operated at its limits. If the LEDs are continuously lit, reducing the output level is recommended to prevent the connected loudspeaker systems from being damaged by overload or clipping. Thermal Brain Circuit (TBC) The internal power amplifiers are capable of producing output peaks that by far exceed the nominal output power capacity as stated in the specifications. To protect the connected loudspeaker systems from being damaged, the TBC reduces the output power: either after a short period of time when the regular output level is continuously exceeded, it is reduced to its nominal value or, depending on the overdrive condition, even a bit lower. A lit LED indicates that the sound system is operated exceeding its output capacity which means, that the connected loudspeaker systems operate in a thermally critical range. In this case reducing the output level of the mixing console is strongly recommended. PROTECT This indicator lights during operation when one of the protection circuits - thermal overload, short-circuit or HF at the outputs - has been activated. Whatever caused the defect - for instance a short-circuit in one of the loudspeaker lines - has to be eliminated. In case of thermal overload, you have to wait some time until the power amplifier automatically re-enters operation mode. pOWER CN IndicatorWhen the power amplifier is in operation mode the LED lights. If the LED does not light after switching the power on, presumably the mains cord is not correctly plugged in or one of the mains fuses is blown. An initial inrush current limiter circuit protects the entire system from being damaged during the power-on operation. The controls and rotary selector switches of the equalizer section marked "LO" and "HI" are used to match the system to different loudspeaker system configurations as well as for the compensation for acoustic problems of the location. A) HI Rotary Selector Switch This rotary selector switch can be set to three different positions. FLAT Set to this position, the MID range is reproduced with a higher level. This setting is preferable for lower and medium volumes and for achieving best intelligibility. - 4dB Set to this position , the MID range at 4kHz is attenuated by 4dB. [. . . ] trying to linearize "mush" via EQ , generally leads to an extremely mid-boosted , metal , aggressive sound. When measuring the range between 250 Hz and 5 kHz (the "critical range"), the EQ should only be used to attenuate the signal and never to increase it!A "hole" in the sound spectrum is not experienced as unpleasant, as an "arch". Excessively increasing the low-frequency range is also not advisable, since this drastically degrades the transient response of the entire sound system. [. . . ]