Can a car amplifier be wired in house to power subs?

While it's technically possible to wire a car amplifier in a house, it's not generally advisable. Car amplifiers are designed to operate on DC voltage, whereas household electrical outlets provide AC voltage. This means that you'll need to use a power inverter to convert the household AC power into DC power, and car amplifiers are highly inefficient when driven with DC power. As such, they'll consume more electricity and produce more heat than they would when driven with DC power.

Additionally, car amplifiers are typically designed for use with low-impedance speakers, such as car subwoofers, which have an impedance of around 2-8 ohms. House speakers, on the other hand, typically have an impedance of 8-16 ohms, which can cause problems with car amplifiers, which may not be able to provide enough power to drive the speakers properly.

Finally, car amplifiers are not designed for continuous operation, and running them for long periods of time at home can cause them to overheat and fail.

For these reasons, it's generally better to use a home stereo amplifier to power house speakers. Home stereo amplifiers are designed for use with AC power, they can drive high-impedance speakers, and they are more efficient and reliable than car amplifiers.