Infinity REF-704a Owner's Manual
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Infinity REF-704a Owner's Manual

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INFINITY REFERENCE
REF-704a/REF-4555a/REF-551a AMPLIFIER
OWNER'S MANUAL

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Summary of Contents for Infinity REF-704a

  • Page 1 INFINITY REFERENCE REF-704a/REF-4555a/REF-551a AMPLIFIER OWNER’S MANUAL...
  • Page 2 THANK YOU FOR YOUR PURCHASE . . . Your Infinity product has been designed to provide you with the performance and ease of operation you would expect from Infinity. • Please take time to read your owner's manual in its entirety before operating or installing your amplifier.

  • Page 3: Table Of Contents

    8. Crossover filter selectors ....................... 9. Gain ....................... 10. Crossover frequency controls ....................... 11. HALOsonic input ....................... 12. ADAS Assign (REF-704a and REF-4555a) ....................... 13. ADAS Input (REF-704a and REF-4555a) ....................... CHAPTER 3: OPERATIONS ..........................................CHAPTER 4: TROUBLESHOOTING .......................

  • Page 4: Chapter 1: Pictorial Index Of Input Connections

    CHAPTER 1: PICTORIAL INDEX OF INPUT CONNECTIONS REF Amplifier top panel PROTEC T POWE R REF Amplifier front panel REF Amplifier back panel 10 12 13...

  • Page 5: Chapter 2: Installation And Wiring

    INFINITY REFERENCE CHAPTER 2: INSTALLATION AND WIRING What's in the box: 1 amplifier 2 spare fuses (x3 with REF-4555a) 4 RCA adapters (x2 with REF-551a) Quick-start guide Precautions: IMPORTANT: Disconnect the vehicle’s negative (–) battery terminal before beginning the installation.

  • Page 6: Power Indicator

    (+) terminal, and negative (-) lead to the appropriate negative (-) terminal. • The REF-704a features Front L+, L-, R+, and R- terminals, and Rear L+, L-, R+, and R- terminals. ° 4-channel operation: Connect the front left speaker to the Front L+ and L- terminals, and the front right speaker to the Front R+ and R- terminals.
  • Page 7 INFINITY REFERENCE ° 3-channel operation: Connect the stereo speakers to the Front terminals, as described above. Connect the single speaker’s + lead to the Rear L+ terminal, and the - lead to the Rear R- terminal. Left front speaker Right front speaker 4-ohm subwoofer °...
  • Page 8 • The REF-4555a features Front L+, L-, R+, and R- terminals; Rear L+, L-, R+, and R- terminals; and Sub + and - terminals. ° 5-channel operation: Connect the front left speaker to the Front L+ and L- terminals, and the front right speaker to the Front R+ and R- terminals.

  • Page 9: Fuses

    If you’re connecting only one sub, you can use either set of positive and negative terminals. NOTE: Minimum speaker impedance for stereo full-range and subwoofer operation is 2ohms. Minimum speaker impedance for bridged operation is 4ohms. 4. Fuses: • Replace only with fuses of the same amperage: ° REF-704a, REF-551a: 30A ° REF-4555a: 30A...

  • Page 10: Power Input Connectors

    • If your source unit offers preamp outputs, connect to the FRONT, REAR, and/or SUB inputs using RCA patch cables. • To connect a second amp directly to the REF-704a amplifier, run a patch cable from the PRE OUT outputs to the second amp’s preamp inputs.

  • Page 11: Input Level

    8. Crossover filter selectors (X-OVER): Crossover-filter selectors (REF-704a and REF-4555a only; REF-551a filter is low pass only). • LP: Low pass. Choose this setting if you’re connecting a subwoofer(s), or want to provide a low-pass filter for separate mid-bass speakers.

  • Page 12: Crossover Frequency Controls

    Also functions as a full-range mixing input. 12. ADAS ASSIGN (REF-704a and REF-4555a models only): If you’ve connected the amp to an Advanced Driver Assistance System (see 13, next), this dial allows you to select the speaker over which you’ll hear ADAS messages.

  • Page 13: Chapter 3: Operations

    INFINITY REFERENCE CHAPTER 3: OPERATIONS Setting the input levels: To match your amplifier’s input sensitivity (gain) to your source unit’s output level, we recommend the following procedure: A. Turn both input level controls counterclockwise to MIN (minimum). B. Play a dynamic music track through your source unit. Turn the source unit’s volume control to the 3/4 position.

  • Page 14: Chapter 4: Troubleshooting

    Selecting the subwoofer phase You can choose a subwoofer phase output of 0° or 180°. To check your sub's phase, play music with lots of bass and listen as another person slowly flips the 0/180 degree phase switch back and forth. The correct setting is the one that gives you more bass. If you don't detect any real difference, leave the switch in the 0 setting.

  • Page 15: Chapter 5: Specifications

    INFINITY REFERENCE PROBLEM: Music lacks dynamics or "punch." CAUSE and SOLUTION: Speakers are not connected properly. Check speaker connections for proper polarity. PROBLEM: Amplifier fuse keeps blowing. CAUSE and PROBLEM: The wiring is connected incorrectly or there is a short circuit. Review installation precautions and procedures in manual.
  • Page 16 © 2016 HARMAN International Industries, Incorporated. All rights reserved. Infinity is a trademark of HARMAN International Industries, Incorporated, registered in the United States and/or other countries. The Bluetooth word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any ®...

This manual is also suitable for:

Ref-4555aRef-551aReference ref-704aReference ref-4555aReference ref-551a

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