Mark levinson no 23 5 owners manual

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2 Voltage selection The Nº23.5 is factory-set (internally) for 100V, 120V, 200V, 220V, or 240V AC mains operation. Make sure that the label on the rear panel of the amplifier indicates the correct AC operating voltage for your location). If the voltage indicated is incorrect, see your Mark Levinson dealer. If you wish to change the AC operating voltage of your Nº23.5, see your Mark Levinson dealer. A Nº23.5 typically uses from 225W (at idle) to 1200W (at its rated power into 8-„¦). It may be powered by a 15-ampere AC mains line. For optimum performance into lower-impedance loads, however, it's recommended that the AC mains outlet used for the Nº23.5 be capable of supplying a minimum of 20 amperes @ 100V and 120V AC, and 10 amperes @ 200V, 220V, and 240V AC. If other devices are also powered from the same AC circuit, their additional power consumption must be considered. Two slow-blow 250V 3AG fuses (15 ampere @100V and 120V AC and 8 ampere @200V, 220V, and 240V AC) are located on the rear panel of the Nº23.5. Replace the fuses only with the same type. ALWAYS remove the AC cord before removing the fuses. FUSE - FUSE - FUSE - PUSH PUSH AC mains fuses AC connector Output (right) Output (left) Nº23.5 DUAL MONAURAL AMPLIFIER WARNING:HAZARDOUS VOLTAGES AVAILABLE INSIDE: DISCONNECT AC~ MAINS CABLE BEFORE REMOVING ANY COVERS. HIGH ENERGY AVAILABLE AT LOAD TERMINALS. REFER TO OWNER'S MANUAL FOR PROPER TERMINATION INSTRUCTIONS. DISCONNECT AMPLIFIER FROM AC~ MAINS BEFORE REPLACING FUSES. MAINS FUSES: PLEASE CONSULT OWNER'S MANUAL. - 90 - 110 VAC~ - 105 - 125 VAC~ - 180 - 220 VAC~ - 210 - 240 VAC~ - 230 - 250 VAC~ - ~47-400 Hz SERIAL NO. INPUT BALANCED INPUT OUTPUT RIGHT CHANNEL LEFT CHANNEL +-“ +-“ OPERATING VOLTAGE: Voltage indication Shorting strap Balanced input (right) Balanced input (left) Single-ended input (left) Single-ended input (right) Shorting strap DESIGNED AND MANUFACTURED IN U.S.A. BY MADRIGAL AUDIO LABORATORIES, INC. ® FUSE - FUSE - FUSE - Figure 1: Rear panel PRECAUTION

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3 Signal connections The Nº23.5 incorporates RCA-type and XLR-type connectors for audio signal input. The Madrigal-designed RCA-type connectors used for single-ended audio interconnection are a great improvement over ordinary RCA- type connectors. The gold-plated XLR-type connectors employed are of European design, and are made to professional application standards. When connecting the Nº23.5 to a preamplifier, we recommend Madrigal Audio Laboratories HPC Interconnect Cable. HPC Interconnect Cable is available in various lengths, pre-terminated with RCA, XLR, and Camac connectors. See your Mark Levinson dealer. The Nº23.5 can be operated in either single-ended or balanced mode. In each of these modes, the Nº23.5 can be operated either normally (non-inverting) or inverting. Note: This manual describes the connections for single-ended normal (non-inverting), single-ended inverting, and balanced normal (non-inverting) operation. If you have questions about these or other methods of signal connection, see your Mark Levinson dealer. Typical audio systems require that the amplifier be of the non-inverting type. This means that the output signal of the amplifier will be in phase with the input signal. For this type of operation, connect the main outputs of your preamplifier to the left- and right-channel RCA-type inputs (non- inverting) on the rear panel of the Nº23.5. Be sure that the shorting strap is inserted into the XLR-type connectors between Pins 1 and 3. Connectors Cables Connection methods and operating modes Single-ended normal (non-inverting) operation PUSH PUSH +-“ Nº23.5 -“+ -“+ Left Loudspeaker +-“ Right Loudspeaker From preamplifier main output Shorting strap Right channelLeft channel Figure 2: Connections for single-ended normal (non-inverting) operation