Chapter 5: Specifications - Infinity REF-704a Owner's Manual

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. Turn down gain. Move audio cables away from power wires. Install an alternator
noise filter on power line between battery and alternator. Check ground connections on the amplifier since a loose or improper ground is one
of the main causes for extraneous noise in your audio system.

CHAPTER 5: SPECIFICATIONS

RMS power
Model
@ 4 ohms
REF-704a 70W x 4
45W x 4
REF-4555a
320W x 1
REF-551a 370W x 1
Line in signal-to-noise ratio
Model
(reference to 1 watt)
REF-704a ≥85dB
Full:≥85dB
REF-4555a
Sub:≥80dB
REF-551a ≥80dB
RMS power RMS bridged power
@ 2 ohms @ 4 ohms
100W x 4 200W x 2
65W x 4 130W x 2
500W x 1 /
550W x 1 /
THD+ N at rated power Product dimensions
(20Hz – 20kHz) (L x W x D)
358 x 185.5 x 55.75 mm
≤1%
14-1/8" x 7-5/16" x 2-1/4"
398 x 185.5 x 55.75mm
≤1%
15-11/16" x 7-5/16" x 2-1/4"
238 x 185.5 x 55.75mm
≤1%
9-3/8" x 7-5/16" x 2-1/4"
Total peak Frequency Maximum
power response signal input
1000W 10Hz-40kHz 20V
10Hz-40kHz
(full range)
1800W 20V
10Hz-320Hz (sub)
1300W 10Hz-320Hz 20V
Shipping weight (kg) Fuse size
4.33kg
30A x 2
(9.5lbs)
3.26kg
30A x 3
(7.2lbs)
5.01kg
30A x 2
(11.0lbs)
Maximum
sensitivity
200mV
200mV
200mV
Operating
voltage
9-16VDC
9-16VDC
9-16VDC
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