Marantz 1122DC User Manual

The Marantz 1122DC is a high-performance stereo receiver featuring Dolby Digital and DTS decoding, 100 watts per channel, multiple audio inputs, phono input for turntables, digital optical/coaxial inputs, remote control, tone controls, headphone jack, and DC servo amplifier technology. Operating on 120V AC, 60Hz. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Devices 7. Audio Source Selection 8. Tone Controls 9. Care & Maintenance 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Stereo amplifier section, preamplifier controls, input selector, tone controls, headphone output, speaker terminals.

Feature	Description
Power Output	100 watts per channel (8 ohms)
Phono Input	For turntable connection with RIAA equalization
Aux Input	For additional audio sources
Tape Monitor	For tape deck recording/playback
Tone Controls	Bass and treble adjustment
Loudness Control	Enhances low frequencies at low volumes
Headphone Jack	For private listening
Speaker Selector	A/B speaker switching
Power Switch	Main power on/off
Volume Control	Main volume adjustment

Installation

Unpack and inspect contents. Place on stable, well-ventilated surface.

Connect speakers: Use speaker wire to connect to A/B speaker terminals.
Connect audio sources: Use appropriate inputs (Phono, Aux, Tape).
Connect antenna: For FM/AM reception.
Plug into AC power outlet.

WARNING! Ensure proper ventilation; do not block ventilation openings. Use correct speaker impedance.

First-Time Setup

Power on receiver; set initial controls.

Set volume to minimum: Turn volume knob fully counterclockwise.
Select input source: Use input selector for desired source (Phono, Aux, etc.).
Adjust tone controls: Set bass and treble to neutral position.
Test speakers: Gradually increase volume to check both channels.

CAUTION! Always turn volume down before powering on or changing sources to prevent speaker damage.

Specifications

Power Output: 100 watts per channel (8 ohms)
Frequency Response: 20Hz - 20kHz (±1dB)
Total Harmonic Distortion: 0.05%
Input Sensitivity: Phono: 2.5mV, Aux: 150mV
Signal-to-Noise Ratio: 80dB (Phono)
Tone Controls: Bass ±10dB, Treble ±10dB
Power Requirements: 120V AC, 60Hz
Dimensions: Standard component width

Controls and Settings

Front Panel: Power switch, input selector, volume, bass, treble, loudness, speaker selector, headphone jack.

Rear Panel: Speaker terminals, phono input, aux input, tape inputs/outputs, AC power cord.

Input Selection: Phono, Aux, Tape. Tone Controls: Bass and treble adjustment. Loudness: Compensates for Fletcher-Munson curves. Speaker Selection: A/B speakers or both. Volume: Main output level control.

Connecting Devices

Phono: For turntables with magnetic cartridges. Aux: For CD players, tuners. Tape: For tape decks.

Turn off receiver before connecting devices.
Use proper cables for each input type.
Ensure secure connections to terminals.
Keep signal cables away from power cords.

Tip: Use high-quality interconnects for best audio performance.

Audio Source Selection

Supports multiple audio sources with individual input optimization.

Phono Input: Specifically for turntables with RIAA equalization.
Aux Input: For line-level sources like CD players.
Tape Inputs: For recording and playback from tape decks.
Source Selection: Rotate input selector knob to desired source.
Volume Adjustment: Use volume control for desired listening level.
Balance: Adjust left/right channel balance if needed.

WARNING! Do not connect phono-level sources to aux inputs or vice versa.

Tone Controls

Bass and treble controls allow frequency response adjustment. Loudness control enhances bass at low volumes.

Care & Maintenance

Unplug before cleaning. Use soft, dry cloth for exterior. Keep away from moisture and extreme temperatures.

CAUTION! Do not use liquid cleaners; avoid getting moisture into controls or vents.

Regulatory Information

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound	Volume/Speakers	Check volume setting; verify speaker connections; ensure input selected.
Distorted sound	Overload/Impedance	Reduce volume; check speaker impedance matches requirements.
Hum or noise	Grounding/Cables	Check ground connections; ensure proper cable routing.
One channel silent	Balance/Connection	Check balance control; verify both speaker connections.
No phono sound	Turntable ground	Ensure turntable ground wire connected to ground terminal.

Service: Contact authorized Marantz service center for repairs.