The Alpine 3527 (including variants like the 3527V and 3527S) is a vintage, old-school 4/3/2-channel bridgeable car audio power amplifier
Key Specifications & Features
• Power Output (Alpine 3527V):
• 25 watts x 4 into 4 ohms
• 35 watts x 4 into 2 ohms
• 70 watts x 2 (or 70W x 1 mono bridged)
• 280 watts max
You can review wiring instructions and connection layouts via the Alpine 3527 Owner's Manual PDF https://vault.alpine-usa.com/products/documents/OM_3527.pdf