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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. To power two subwoofers in series, connect one sub's positive (+) lead to the positive terminal on
the left, and the other sub's negative (-) lead to the negative terminal on the right, then connect left sub's negative lead to the right sub's
positive lead.
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
4-ohm subwoofer
PARALLEL WIRING
2-ohm subwoofer
SERIES WIRING
4-ohm subwoofer
2-ohm subwoofer
6

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

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