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INFINITY SPEAKERS ALPHA 121W
MRP: $103.87 Offer Price: $72.79
Experience powerful, precise bass with the Infinity Alpha 121W 12-inch Subwoofer. Designed for both sealed and ported enclosures, it delivers clean low-end performance with 250W RMS power handling and a durable polypropylene cone. Ideal for car audio enthusiasts who want strong, distortion-free bass in compact or shallow spaces.
Description
Specifications & Key Features
| Parameter | Spec / Feature |
|---|---|
| Model | Infinity Alpha 121W (12″ single-voice-coil subwoofer) Price History+3Ubuy India+3Amazon India+3 |
| Nominal Impedance | 4 Ω Ubuy India+2Amazon India+2 |
| RMS Power Handling | ~ 250 Watts RMS Ubuy India+2Amazon India+2 |
| Peak Power Handling | ~ 1,800 Watts Peak Ubuy India+2Walmart.com+2 |
| Frequency Response | ~ 35 Hz – 200 Hz Walmart.com+2Ubuy India+2 |
| Sensitivity | ~ 89-90 dB (2.83V / 1m) Amazon India+2Walmart.com+2 |
| Woofer Size / Mount Type | 12-inch, shallow-mount design (fits tighter spaces) Ubuy India+2Walmart.com+2 |
| Enclosure Compatibility | Works with both sealed or ported enclosures Ubuy India+2Desertcart+2 |
| Other Noted Features | Polypropylene cone + rubber surround for durability; marketed as “accurate bass” and somewhat “shallow” to suit tighter mounting depth. Ubuy India+2Desertcart+2 |
What That Means in Practice
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With 250 W RMS, this subwoofer is mid-powered; it can produce strong bass without needing a huge amplifier, but to get the best performance you’ll want an amp that can deliver that RMS well (not just peak).
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The 1,800 W peak number is more for short bursts; in sustained usage you’ll be limited by the RMS rating, thermal handling, excursion limits, etc.
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The low end of ~35 Hz is decent; the sub can reproduce fairly deep bass. However, real-world output at those frequencies depends heavily on the enclosure, power supply, and how well the sub is mounted.
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The shallow-mount aspect is useful when there is limited depth available (trunk, underfloor, etc.). If installed in a deep enclosure, you may get little more output or headroom, but it’s especially helpful for tight spaces.
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Sensitivity of ~89-90 dB is good but not “high”; it means you’ll need decent power to push it loud without distortion. Weak head units may not be enough.
What to Check / Limitations
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Ensure the amplifier you pair with it can really supply ~250 W RMS into 4 Ω continuously, with good power rails and cooling. Undersized amps will distort or limit performance.
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The enclosure matters a lot: sealed vs ported will change character — sealed will give tighter, punchier bass; ported will give more output in the mid-bass / lower frequencies but require more space and careful port tuning.
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Mounting depth may be shallow, but check the exact depth clearance in your car. Even shallow subs need enough “wiggle room” for cone/surround excursion.
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With high peak power, mechanical stress / cone/surround durability may be a factor if you drive it hard often. Also thermal limits could be reached if ventilation is poor.
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Often packaging / marketing exaggerate “peak” or “max” numbers more than RMS. Real output will be closer to what the amp and enclosure allow than what the “peak” spec suggests.
1 review for INFINITY SPEAKERS ALPHA 121W
INFINITY SPEAKERS ALPHA 121W
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Shallow-mount design made installation in my car doors effortless, and the sound is surprisingly full.