Why the 4 ohm rating on a car amp is more Important than the 1 ohm rating

The subwoofer in the video is a Slapz Oblivion v2 18, use discount code CAE at Slapz Audio A strong 4-ohm number usually means the amp has real voltage swing, real power supply strength, and isn’t just built to dump current at a low impedance for a flashy rating. A weak amp might claim a big 1-ohm number, but then the 4-ohm number is pathetic. That tells you the amp may be highly dependent on low impedance/current draw and may not have the same clean authority, control, or usable headroom. For subwoofer amps, that matters because your subs are almost never sitting at the “rated” impedance while music is playing. The box, frequency, impedance rise, tuning area, coil heat, and vehicle cabin all change what the amp actually sees. So even if you wired it to 1 ohm, the amp may be playing a lot of music at 2, 3, 4 ohms or higher depending on frequency. That’s why a strong 4-ohm rating is a clue that the amp can still make power when impedance rises — which is real-world bass.