Name: Infinity Alpha 1302A 2-channel amplifier
SKU: INF18
Availability: InStock

Description

Key Specifications

Here are the main specs gathered from multiple sources:

Parameter	Value
Channels	2 channels (stereo) roadentertainment.com+1
RMS Power Output	65 W × 2 at 4 Ω per channel roadentertainment.com+1
RMS at 2 Ω	85 W × 2 at 2 Ω per channel roadentertainment.com+1
Bridged Power (4 Ω bridged)	170 W × 1 when both channels are bridged to drive a single load roadentertainment.com
Peak Power	Up to 500 W peak (bridged at 4 Ω) roadentertainment.com+1
Frequency Response	10 Hz – 45 kHz roadentertainment.com+1
Signal-to-Noise Ratio (S/N)	~ 75 dB roadentertainment.com
High-Pass / Low-Pass Crossover Filters	Yes, adjustable HP/LP filters included. roadentertainment.com+1
Operating Voltage	9 V – 16 V (typical automotive range) roadentertainment.com
Fuse Rating	30 A (single fuse) roadentertainment.com
Recommended Wire Gauge	8 AWG for power lines. roadentertainment.com
Dimensions	Approximately 10-1/4 in × 2-3/16 in × 8-1/8 in (~ 26 × 5.6 × 20.6 cm) roadentertainment.com
Weight	~ 2.09 kg roadentertainment.com

Class AB design gives better mis-frequencies and sound quality, at the cost of some more heat and less efficiency compared to Class D amps.
Bridging capability – you can use the amp in stereo (2× channels) or bridge both channels to get more power to a sub or single speaker. Useful flexibility.
Crossover filtering – having adjustable HP/LP crossovers helps you fine-tune which frequencies the amp sends to your speakers or subwoofer, allowing better integration and reducing distortion.
Compact size for its power class – the physical dimensions are reasonably small, so it can fit in many car amplifier mounting spots.

For small to medium speakers (door speakers, coaxials), 65 W × 2 RMS is decent. Will give noticeable improvement over weak factory head units.
If you’re using one channel or bridging, in bridged mode you can get decent sub output (170 W bridged), enough for moderate bass in a car if the enclosure and power are good.
The wide frequency response (down to ~10 Hz, though in practice output below ~30-40 Hz may be limited by speaker/enclosure) gives you good fidelity.

The power numbers are modest for very demanding setups. If you have large subs or speakers that need a lot of power, this may not be enough.
Heat: AB amps are less efficient, so under heavy use (driving low impedances, high gain) the amp may run hot. Good ventilation and proper wiring are essential.
Bridged mode increases current draw; ensure your power wire, battery, and ground are capable. Undersized wires or weak grounds will degrade performance or cause voltage drop.
Noise floor / S/N 75 dB is okay, but not “audiophile”-quiet. At low volumes, you may hear some noise (depending on system).

Best paired with mid-power speakers: 4-6.5″ coaxials or component sets, or maybe small woofers/subs in bridged mode.
For a full car audio setup: front + rear speakers + a sub, this amp may suffice for mid-range speakers, but you’d need a separate sub amp or a more powerful amp for serious bass.
Wiring: use good quality wire (8 AWG for power is recommended), decent gauge for speaker wires, secure mounting and good insulation.