Name: INFINITY Alpha 2804A 4-Channel Amplifier
SKU: INF19
Availability: InStock

Description

Spec / Description: Infinity Alpha 2804A

Spec	Value / Details
Channels	4 (stereo front + rear) Desertcart+2Flipkart+2
Power Output (RMS)	~ 70 W × 4 at 4 ohm per channel Desertcart+2Instagram+2
Power Output (Other Impedances / Bridged)	Listings say “90 W × 4 @ 2 ohm” and “180 W × 2 bridged @ 4 ohm” under some conditions. Instagram+2Amazon India+2
Frequency Response	Approx 10 Hz – 45 kHz according to one info source. Instagram
Signal-to-Noise Ratio (S/N)	~ 75 dB (common value in some product listings) Flipkart+1
Class / Topology	Class AB amplifier; MOSFET power supply mentioned in some listings. Flipkart+1
Channels Load / Impedance	Specified for 4-ohm load per channel for RMS rating; can handle 2-ohm load in some channels (with reduced headroom) per some claims. Instagram+1
Max / Peak Power	Some listings mention “maximum power output ~240 W” (sum) or “70 W × 4 = 280 W total RMS in ideal load” though actual continuous output is lower. Flipkart+1
Physical / Other Features	Has adjustable filters (HP/LP crossover) in many listings; features “efficient cooling design” in certain advertise texts. Desertcart+2Amazon India+2

Here’s how the 2804A would perform and what you should keep in mind.

Good upgrade over OEM: If your car’s factory stereo is weak, this amp giving 70 W per channel at 4 ohm is a decent step up for front & rear door or coaxial speakers.
Flexibility: 4 channels lets you power front + rear, or bridge two to get more for component speakers or a small sub (if matched properly).
Headroom: Having extra power means less distortion when pushing volume; not having the amp working at its limits all the time helps reliability & sound quality.
Features: Crossovers, decent impedance handling, and cooling are all useful for tuning, avoiding overheating, and preserving lifespan.

Actual output lower than “peak” claims: RMS ratings are what count; don’t be impressed only by big peak numbers. Sustained power will be closer to the 70 W × 4 rating at 4Ω.
Heat & Efficiency: As with most Class AB amps, they aren’t super efficient. In high loads, lower impedances, or with weak ventilation, they may get hot, which can affect stability.
Wiring: To deliver clean power, you’ll need proper power wiring (good gauge), solid ground, and ensuring that the vehicle battery/alternator can supply required current (especially if driving at lower impedance or pushing lots of power).
Matching Speakers: You’re going to want speakers that can take ~70 W RMS or more, with good sensitivity, for best results. If paired with very inefficient speakers, you may not notice full benefit.
Distortion & Frequency Limiting: Without good filters (crossover set-ups) you could get distortion in lows/highs, or damage tweeters; ensuring filters are properly set helps.