Infinity Reference 475a User Manual

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The Reference subwoofer amplifiers are
single-channel amplifiers. There are two sets of
terminals to make it easy to connect multiple
woofers. Either set of (+/–) terminals may be
used when connecting woofers.
To the right are four application diagrams to
help plan your subwoofer system installation.
NOTE: For simplicity, Figures 3 and 4 do not
show power, remote and input connections.
Subwoofers or voice coils connected in series.
Subwoofers or voice coils connected in parallel.
APPLICATIONS – 1300a AND 1600a
Figure 3. Reference 1300a or 1600a amplifier with two
woofer connections.
NOTE: Minimum impedance of each subwoofer = 4 ohms
if subwoofers are connected in parallel and 1 ohm if they
are connected in series.
NOTE: Minimum impedance of subwoofer = 2 ohms
Figure 4. Reference 1300a or 1600a amplifier with one
woofer connection.

Infinity Reference 475a Specifications

General

Damping factor	6.3
Amplifier class	A/B
Frequency range	10 - 100000 Hz
Input sensitivity	100 mV
Built-in crossover	No
Audio output channels	4.0 channels
Peak power per channel	117 W
Signal-to-Noise Ratio (SNR)	85 dB
Total Harmonic Distortion (THD)	0.02 %
RMS power output per channel (2 Ohm)	90 W
RMS power output per channel (4 Ohm)	75 W
DC-in jack	Yes
Audio (L/R) in	21
USB 2.0 ports quantity	0
Speakers connectivity type	Clamp terminals
Purpose	Car
Material	Aluminum
Cooling type	Passive
Product color	Aluminium, Grey
Volume control	Rotary
Connectivity technology	Wired
Maximum current	72 A
DC input voltage	10 - 14 V

Weight and Dimensions

Depth	360 mm
Width	229 mm
Height	68 mm