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The Alpine KTA-30MW is a compact Class D monoblock subwoofer amplifier rated 300W RMS (600W peak) at 2 or 4 ohms. Its standout trait is an IP66 weather-resistant, tough housing and a small footprint (about 9 by 3.8 by 1.6 inches, 1.35 kg), which suits motorcycles, ATVs, UTVs and tight car installs. It has a variable 50-400 Hz low-pass filter and 0-12 dB bass boost at 50 Hz. The best new price is $324.93 at eBay as of November 7, 2026, with 3 stores selling it new.
In stock
In stockSold by Drive In Autosound
Availability unknownSold by ctabargainsatl (100% positive, 1,500 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.
Availability unknownSold by audiosavings (99.6% positive, 867,700 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.
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Lowest price we've seen: $361.22 on Nov 7 at Online Car Stereo. Tracked across 12 stores since Nov 7.
With 10 ratings averaging 4 out of 5, owners mostly like the small size and weather resistance for motorcycle and powersports installs. Some note it is not a high-power amp and expect more output than 300W RMS delivers.
Product Details Alpine KTA-30MW Class D Monoblock Weather Resistant Power Pack Amplifier Power Handling 300W RMS x 1 @ 2/4 Ohms 600W Peak x 1 @ 2/4 Ohms CTA-2006 compliant Frequency Response: 20-400 Hz Total Harmonic Distortion (THD): <1% Signal to Noise Ratio: 83dB Variable Low Pass filter 50-400Hz @ -24dB/Oct. Variable Bass Boost (0-12 dB at 50 Hz) Fuse Rating: 25A Weather resistant (IP66 rating) Dynamic Peak Power (D.P.P.) technology which intelligently adjusts the gain to automatically adapt to musical needs Dimensions: 7??ç?Ñ W x 3.5??ç?Ñ H x 1.25??ç?Ñ D Power Specifications - Full Range Channels RMS Power @ 4 ohms RMS Power @ 2 ohms RMS Power @ 1 ohm Bridged RMS Power Power Specifications - Subwoofer Channel RMS Power @ 4 ohms RMS Power @ 2 ohms RMS Power @ 1 ohm
