Alpine 3521
A vintage car power amplifier made in Japan, with a PWM power supply and RCA/DIN inputs.
Overview
The Alpine 3521 is a car audio power amplifier, made in Japan. It was commonly paired with Alpine head units like the 7146, as a dedicated amplifier in OEM or aftermarket setups. Enthusiasts call it an "old school" amplifier. It has come up in discussions alongside models like the Kenwood KAC-1020 in classic mobile audio builds.
Specifications
| Product type | Power Amplifier, Car Amplifier, Vintage Car Amp |
| Manufacturer | Alpine |
| Origin | Japan |
| Power output | 2 x 50W at 4/2 ohms (selectable impedance switch) |
| THD | 0.08% |
| Technology | POWER AMPLIFIER WITH PWM POWER SUPPLY |
| Inputs | RCA inputs, DIN input |
Market
The Alpine 3521 has appeared in the used market with individual listings reaching £240.84 on Etsy, while other sales bundled it with Alpine radios—for example, one unit sold for $200 with an Alpine 7902 in 2017. Due to its age, potential reliability concerns exist, with one forum noting that "25 years is a LONG time for electronics." A service manual is available for those seeking maintenance or repair.
eBay Listings
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