User manual DYNACORD S 900

[. . . ] The wide blade or the third prong are provided for your safety. When the provided plug does not fit into your outlet, consult an electrican for replacement of the absolete outlet. IMPORTANT SERVICE INSTRUCTIONS CAUTION: These servicing instructions are for use by qualified personnel only. To reduce the risk of electric shock, do not perform any servicing other than that contained in the Operating Instructions unless you are qualified to do so. Refer all servicing to qualified service personnel. 1. [. . . ] The sound quality of the STANDARD PRECISON SERIES power amplifiers is superb. Using comprehensive dimensioned power supply units with low-interference toroidal transformers gains a headroom that exceeds the nominal power handling capacity by far. No V/I-Foldback-Limiter circuits are employed within the power amplifiers, making it possible to operate the amps on complex loads up to ±90° phase angles without a problem. The input facilities are carried out as balanced XLRF-type sockets while the Direct-Outs ­ on which the carried-through signals are present ­ come as XLRM-type connectors. Using the Input Routing-switches lets you determine if the STANDARD PRECISION SERIES amplifiers are operated in DUAL (stereo) or PARALLEL (monaural) mode; "mono-bridged" operation is also possible. The dB-scaled level controls are to be found on the front panel. These detented potentiometers guarantee precise and reliable operation. The easy readable LED display offers quick optical information on the power amplifiers' momentary operational mode. For each channel individually the display shows whether they are operational, a signal is present at the outputs, when the limiters are activated, and whether one of the protection circuits has been engaged or not. The power outputs CANNEL A, CHANNEL B and BRIDGED OUT are carried out as Speakon connectors. A ground-lift switch that separates the enclosure from the appliance's ground potential and therefore helps to eliminate ground noise loops and the mono bridged mode switch are also located on the rear panel. In normal operation all STANDARD PRECISION SERIES power amplifiers can be used to drive loads down to 2 ohms; in bridged mode the minimal load is 4 ohms. All amps are equipped with extremely silent running fans providing front-to-rear air circulation, guaranteeing trouble-free operation even in smaller power amplifier rack systems. Studying this owner's manual carefully will provide you with further and more detailed information about the STANDARD PRECISION SERIES power amplifiers. Thus we recommend to keep on reading, assuring you that the DYNACORD STANDARD PRECISION SERIES power amplifiers will provide you with a lot of fun and satisfaction in your work. 9 FRONT PANEL 1. LEVEL Detented potentiometers with a dB-scaling to adjust the overall amplification of the power amplifier. These controls should be set between 0 dB and ­6 dB, depending on the output of the connected equipment ­ e. The printed scale shows the actual amount of damping in the amplification of the power amplifier. 2. LIMIT This indicator lights when the amplifier enters clipping and the internal limiter is activated. Anyway, if this indicator lights continuously, reducing the overall volume is recommended to avoid that the connected loudspeaker systems are getting damaged from overload. 3. SIGNAL INDICATOR This indicator lights when an output signal is present. In case of short-circuited speaker cabling or one of the amplifier's protection functions is engaged the indicator is off, showing that there is no signal outputted. 4. [. . . ] Bridged mode operation on loads of 2 ohms is not admissible. GROUND-LIFT SWITCH The ground-lift switch is meant to help you in avoiding ground noise loops. Whenever the power amplifier is installed in a 19" rack system being operated together with other equipment, the recommended setting of the switch is the GROUNDED position. In case the power amplifier is used together with appliances that are connected to different ground potentials, the recommended setting is UNGROUNDED. 12 SPECIFICATIONS Technical Specifications: S900, S1200 Amplifier at rated conditions, both channels driven with 8 ohms loads, unless otherwise specified. The warranty does not cover damage that results from improper or inadequate treatment or maintenance. [. . . ]