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Engadget Guide: Reuse Old Speakers to Upgrade TV Sound

Engadget explains how old active or passive speakers can be reused with a TV, including output and USB power limits.

AI News Feed · 2026-10-25 22:45

The guide divides speakers into active models, which have built-in amplifiers and often use a 3.5mm or RCA cable, and passive hi-fi or floor-standing speakers, which require an amplifier rated for the speaker. On the TV side, the simplest case is an analog audio output over 3.5mm or RCA. If the set has only an optical output, a basic digital-to-analog converter can make the signal usable unless the speakers or amplifier already have an optical input. If HDMI ARC is the only audio output, the article says options exist but typically cost more.

For USB-powered PC speakers, Engadget warns that the USB connection usually carries power only; audio still needs a separate 3.5mm or RCA cable, and TVs generally do not recognize USB devices that require drivers. A standard USB 2.0 port supplies 5V at 500mA, or 2.5W, according to the article, enough for small desktop speakers at modest volume but not for larger gear. A TV with over-current protection may trip the port or enter standby if the speakers demand more, producing cutouts at higher volume.

The guide advises checking for a port marked HDD, which can supply just under 1A (900mA), and testing whether USB power remains on when the TV is in standby. Some TVs keep the port powered, while others cut it, so speakers may switch on and off with the set or stay powered continuously, depending on the model. If the TV port is too weak or already occupied, a USB phone charger can power the speakers; most chargers supply more than a TV port, but the speakers will not turn off with the TV unless switched manually.

Once power is arranged, the remaining task is to connect the speaker's input to the TV's audio output, the article says. It recommends locating a port labeled "audio out" on the back or side of the TV.