INFINITY REFERENCE
6
4. Fuses:
• Replace only with fuses of the same amperage:
° REF-704a, REF-551a: 30A
° REF-4555a: 30A
NOTE:
Minimum speaker impedance for stereo full-range and subwoofer operation is 2ohms. Minimum speaker impedance for bridged operation
is 4ohms.
If you’re connecting only one sub, you can use either set of positive and negative terminals.
• 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.
2-ohm subwoofer
SERIES WIRING
PARALLEL WIRING
2-ohm subwoofer
4-ohm subwoofer
4-ohm subwoofer
