User manual CARVIN DCM150

[. . . ] TOTALLY MODULAR With the DCM150, Carvin brings you totally modular construction. If you ever need an I/O (input/output) connector card because a connector wore-out, just unplug it and re-install the replacement card in minutes. This applies to every aspect of the DCM150 amp including the power supply, power cards, and heat sinks. Everything is connected by heavy-duty connectors for easy replacement--even the Toroid transformer is a total plug-in. [. . . ] However, consistent flashing caused from higher frequencies may damage high frequency drivers (excessive distortion). EQ EXPAND SWITCH The DCM150 can be operated in bridge mode if you require a 70V distribution speaker system or a high powered mono (single channel) amp. With your amp off, push in the rear BRIDGE switch after you have made your speaker connections to the rear center RED binding posts (ch 1 is + and ch 2 is -). No other speaker jack or binding post can to be used at the same time!". CAUTION: The power developed by bridging your amp can destroy speakers! 12. PARALLEL OR "Y" INPUTS When set to the `in' position this circuit will cut the mids by -4dB at 1KHz. This works well as a loudness contour when operating at low volume levels or adds tone when using it in a bass or guitar rack. When set to the `out' position it provides a flat, normal response. Try it both ways and set as desired. The rear PARALLEL switch allows you to drive both channels from either input. This feature is used to "daisy chain" one piece of equipment to another. Just plug into the unused INPUT (1/4" or XLR) and it will become an output for other equipment. 13. XLR CHANNEL INPUTS For most professional applications, use the XLR balanced input. This will help to reduce hum and allow of longer cable runs from your signal source (mixer, etc). Because this is a balanced input, the gain will be 6 dB higher than using a non balanced 1/4" input. XLR pin configuration: Pin 1: Grounded through the GROUND LIFT switch, Pin 2: positive Bal. CHANNEL 1/4" PHONE JACK INPUT Many times sound systems are connected in such a manner to cause a grounded loop with the inputs that result in audible hum. The input GND LIFT (1/4" & XLR) switch on the rear panel will help eliminate this problem. If not, another way to eliminate ground loops is to install a "line matching" transformer between the amplifier input and the signal source and cut the ground wire to PIN 1. 14. AC POWER These 1/4" TRS phone jacks are designed to receive either balanced or unbalanced input signals. Balanced signals coming into this jacks should be wired with the connector's tip going to signal + and the connector's ring Your amp is designed to run on either 120V 60 Hz. Be sure to check your power source before plugging into a grounded (3 prong) outlet. Never defeat the grounded connection or electrocution may result! CONNECTING THE SYSTEM The following diagrams illustrate typical connections. [. . . ] The unit may be perfectly fine but occasionally the fuse may blow because of high AC voltage surges. After the fuse has been replaced with the proper value and if the fuse fails again, the product will require servicing (be sure to use a slow blow fuse if required). Check your input and speaker output cables. 2) MAINTAINING YOUR EQUIPMENT GREEN & YELLOW--Earth BLUE--Neutral BROWN--Live U. K. MAIN PLUG WARNING: A molded main plug that has been cut off from the cord is unsafe. [. . . ]