User manual HALCRO LOGIC DM88

[. . . ] 1 Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Important Safety Information. . . . . . . . . . . . . . . . . . . 3 Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Electrical safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Protection from fluids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Service warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Standard preamplifier or CD player for example. Very high impedance; "infinite. " Input socket XLR Input impedance 100 kohms + 100 kohms Unbalanced voltage input Current-mode input RCA 100 kohms RCA 60 ohms 13 dm88 Inputs The dm88 has four switch selectable inputs, each having an associated input socket. The input sockets and switch are mounted on the top rear panel, and the switch must be operator set to indicate which input is required. The table below lists the properties of these four inputs. The balanced voltage input or current-mode input are most desirable for minimizing earth loop generated mains hum and ripple, or high frequency interference. Earth loop generated mains hum and ripple, or high frequency interference should not be a problem unless the source equipment is poorly designed. Sources with current-mode outputs are rare and are most likely to have an RCA output socket. The advantages of this source are that: Input styles Balanced voltage input Required output source impedance Low impedance. Standard preamplifier or CD player for example. Standard preamplifier or CD player for example. Standard preamplifier or CD player for example. Very high impedance; "infinite. " Earth loop generated mains hum and ripple are minimized, and cable, plug and socket generated interference is minimized (from poor connections which may be affected by sound vibration for example). The unbalanced input is quite satisfactory so long as earth loop generated mains hum and ripple are not a problem. The minimal path input will result in the most pure sound; unless as above, earth loop generated mains hum and ripple is a problem. The input sockets may have active sources simultaneously connected to them. The selector switch selects the input to be amplified. Input socket XLR Input impedance 100 kohms + 100 kohms Unbalanced voltage input Minimal path voltage input Current-mode input RCA 100 kohms RCA 660 ohms RCA 60 ohms 14 Operation All or some of the input sockets may have active sources simultaneously connected to them. The selector switch selects the input to be amplified. o Once the external cables are connected to the unit, ensure the master ON/OFF switch is in the OFF position. The master ON/OFF switch is on the base of the lower compartment, near the mains socket on the unit. You will have to kneel on the floor at the back of the unit to access the switch. o o Plug the mains plug into a mains outlet. The LEDs on the front and rear of the amplifier will glow red. [. . . ] Since so much care has gone into our products, we are able to offer a strong warranty that protects your investment in Halcro products for years to come. It is our expressed desire that your Halcro products work flawlessly and that you enjoy music, movies, and audio/video entertainment without interruption or compromise to performance. It is the goal of Halcro Customer Service to provide efficient and timely service to Halcro owners and to our dealers. In the event of a technical problem or failure, we will work with you and your authorized Halcro dealer to minimize down time and provide expedient service to remedy the situation. [. . . ]