User manual HAFLER XL-280

[. . . ] The lightning flash with arrowhead symbol adjacent to a terminal is intended to alert the user that the terminal is hazardous live. 1. READ INSTRUCTIONS All the safety and operating instructions of your Hafler equipment should be read before power is applied to the equipment. 2. RETAIN OWNER'S MANUAL These safety and operating instructions should be retained for future reference. provide the same three wire grounded connection. It is important that the blades of the equipment plug be able to fully insert into the mating receptacle. [. . . ] Each channel of the amplifier can be independently optimized for 2, 4, and 8, useful in bi-amping and tri-amping, etc. Instructions on the back of the amplifier explain the various options. UNIVERSAL LINE VOLTAGE INPUT Voltage selection is provided in two bands: 100-140 volts and 200-265 volts, (both 50-60 Hz) via two quick-connect terminals located on the EMI filter board, accessed by removing the top cover. The current-mode control system automatically corrects for the bulk of power line variation with each band. This allows most of the PWM action to be reserved for programming and regulation of output voltages. A flyback topology provides the numerous housekeeping low voltages required by various circuits. PROTECTION CIRCUITS Fan control circuit - Each amplifier channel has a fan control circuit that measures the temperature of the heatsink, and adjusts the fan speed accordingly. This thermally-tracking fan speed circuit keeps fan noise to a minimum when power demands are low. Typically the fans will be turning slowly even at idle conditions - although abnormally low room temperatures may allow the fans to turn off completely. The fan control circuit also has a turn-on blast feature that runs the fans at full speed for a few seconds every time the amplifier is turned on. This serves the dual function of cleaning out the air tunnel, and providing a simple means to check the fans for proper operation. If you suspect that the fans are not operating correctly, try turning the amplifier off, then listening or feeling for the turn-on blast when the amplifier is turned back on. Thermal Standby - If excessive heatsink temperature is detected, the individual amplifier channel will go into thermal standby mode. In Mono mode the amplifier can be configured for Standard Bridge mono, 70V mono or 100V mono operation. Load Switch - Selects the speaker impedance or transformer voltage that will be connected the output binding posts. In Constant Voltage Mode the amplifier can drive an array of speakers using 70V or 100V transformers. These jacks allow bare wire, spade lugs or dual banana plugs to be connected to the amplifier. 11. Allow a minimum of 3" clearance on the front and back of the amplifier vents for adequate ventilation. Chassis/Float ground switch - Isolates Audio Ground from Chassis Ground (Chassis Ground is permanently connected to Earth Ground through the third pin of the power cord). With the switch in the "Chassis" position, the Audio Ground is connected to Chassis Ground. In the "Float" position, Audio Ground is isolated ("floated") from Chassis Ground, and must be connected to Earth Ground by other means. ! CAUTION: Do not attempt to "float" Audio Ground from Chassis Ground unless you are absolutely certain there is some other common ground between the amplifier and the source equipment. Without this common ground, oscillations and severe damage may occur. 13. Mains Power Fuse - Protects the "mains" electrical circuit in case abnormal current draw from the amplifier is experienced. The earth (safety) ground pin of the power connector is permanently connected to the chassis. [. . . ] CE units: Connect as shown above for Dual SPEAKONs or Single 4-Wire SPEAKON. Adjust CH A & CH B level controls independently. ­ 18 ­ BRIDGE MONO MODE (SR2300/SR2800) CE SPEAKON Connector Wiring Connect to CH A output 1. Biamp/Stereo switch not active-(Stereo/Mono switch overrides this switch when in mono/70V/100V mode). for a 4 speaker load, select the 2 setting for both CH A and CH B Load Switches 5. [. . . ]