EN INFINITY REFERENCE REF-704a/REF-4555a/REF-551a AMPLIFIER OWNER’S MANUAL
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. • Keep the owner's manual for your amplifier in your glove compartment along with the owner's manual for your car. • Put your amplifier sales receipt with other important documents in order to expedite warranty service if needed.
INFINITY REFERENCE TABLE OF CONTENTS CHAPTER 1: PICTORIAL INDEX OF INPUT CONNECTIONS ....................................................................................................... 01 CHAPTER 2: INSTALLATION AND WIRING ....................................................................................................... 02 What's in the box Precautions 1. Power indicator 2. Protect indicator 3. Speaker output connectors 4. Fuses 5. Power input connectors 6.
CHAPTER 1: PICTORIAL INDEX OF INPUT CONNECTIONS REF Amplifier top panel 1 2 POWE R PROTEC T REF Amplifier front panel 3 4 5 REF Amplifier back panel 7 6 1 8 9 11 10 12 13
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. • Always wear protective eyewear when using tools. • Choose a safe mounting location, away from moisture. Check clearances on both sides of a planned mounting surface.
1. Power indicator: The light will illuminate in white when the amp is receiving power and playing. 2. Protect indicator: The indicator will illuminate in red if the amp enters Protect mode in the event of conditions such as over/under voltage, short circuit, amplifier output circuit failure, or excessive heat. 3.
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 ° 2-channel (bridged) operation: Connect one speaker’s + lead to the Front L+ terminal, and the - lead to the Front R- terminal Connect the other speaker’s + lead to the Rear L+ terminal, and the - lead to the Rear R- terminal.
• 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. Connect the rear left speaker to the Rear L+ and L- terminals, and the rear right speaker to the Rear R+ and R- terminals. Connect the subwoofer’s positive (+) lead to the + terminal, and the negative (-) lead to the - terminal.
INFINITY REFERENCE • The REF-551a features two positive (+) and two negative (-) terminals. To power two subwoofers in parallel, connect one sub’s positive (+) and negative (-) leads to the positive and negative terminals on the left, and the other sub’s positive and negative leads to the positive and negative terminals on the right.
5. Power Input Connectors: • Power: Run power wire from the +12V input to the positive terminal of the vehicle’s battery. Install an appropriate fuse holder and fuse (60A minimum on REF-704a and REF-551a, 105A minimum on REF-4555a) within 18” (457mm) of the battery. Make sure the wire is not damaged or pinched during installation. Install protective grommets when routing wires through the bulkhead or other sheet metal. Use larger-gauge wiring for longer runs.
INFINITY REFERENCE Always connect the (+) speaker wire to the adapter’s (+) terminal and the (–) speaker wire to the adapter’s (–) terminal. When all wires are connected, plug the adapters into the REF amplifier’s FRONT (and REAR, if using the 4-channel amplifier) preamp inputs. PRE OUT REAR FRONT From high-level source 7. Input level: Use this switch along with the gain control to set the REF amplifier’s input level.
10. Crossover-filter frequency controls (FREQ): Crossover-filter frequency controls. Turn the dials to the left to lower the crossover point, and to the right to raise the crossover point. Crossover point settings vary by listener preference. 11. HALOsonic: Lets you plug in an optional cable into your vehicle’s HALOsonic system (if present). Also functions as a full-range mixing input. 12.
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. C. Turn the front input level control dial clockwise towards MAX until you hear distortion in the music (it’s no longer clear). D.
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. PHASE 0º 180º Boosting the bass Turn the dial lockwise to increase the bass output from 0 dB to +9 dB.
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. Check wiring connections. PROBLEM: Engine noise—whining or clicking—in system when the engine is on. CAUSE and PROBLEM: Amplifier is picking up alternator noise.
HARMAN International Industries, Inc. 8500 Balboa Boulevard, Northridge, CA 91329 USA www.infinityspeakers.com © 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 use of such marks by HARMAN International Industries, Incorporated is under license.
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~ Infinity' HARMAN Infinity Reference REF-704a/REF-4555a/REF-551 a Infinity Reference REF-704a/REF-4555a /REF-551a Quick- Connect Guide D. Route the power wire to the amplifier's location and connect it to the amplifier's + 12V terminal. Be sure to use appropriate grommets whenever routing wires through the firewall or other sheet metal. IMPORTANT: Failure to adequately protect the positive wire from potential damage may resu~ in a vehicle fire. E.
5. Reference REF-704a speakers connections: 2-channel operation 8. Reference REF-704a preamp input connections: 4-channel operation Minimum speaker impedance: 4 ohms each ~~:~~-= II i =~=~=~= ~---ll_::_==~==~==--'----• 4- ohm subwoofer 4-ohm subwoofer 9. Reference REF-704a preamp input connections: 3-channel operation 6. Reference REF-4555a speaker connections Minimum speaker impedance: 2 ohms each Minimum subwoofer impedance: 2 ohms =~=~=~= "'"""'t:."'L>"' !l :~:~:~: "'-:.".::.
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