Beat-Sonic's $799 Encore Sigma Is a Plug-and-Play Amp for the Lexus GX 550 and NX

Modern trucks and SUVs make audio upgrades hard. Factory head units are fused into the dash and the infotainment, and cutting into a harness on a new Lexus is a fast way to lose a weekend and a warranty argument. Beat-Sonic's answer is to replace only the amplifier. PASMAG reported on August 10 that the company launched the Encore Sigma (ENS-L201), a $799 plug-and-play amplifier upgrade available now for the 2022-and-newer Lexus NX and the 2024-and-newer GX 550.

It is a Class AB amplifier with eight channels at 50 watts each, made in Japan. It connects through OEM-style connectors, with no wire cutting, harness modification or speaker replacement. On the NX, it mounts at the factory amplifier location under the center console, and Beat-Sonic says most installs take about an hour with its step-by-step guide.

What you keep, and what you can add

The factory head unit, steering wheel controls and navigation all stay. Beat-Sonic builds in RCA outputs and a remote turn-on wire so a powered subwoofer can be added later without another round of wiring. It fits cars with the factory audio system, not the optional Mark Levinson system.

Beat-Sonic says that on a 2026 Lexus NX 450h+, the sound level rose from 67.0 dB to 79.0 dB, a 12 dB increase it describes as about four times louder. That is the company's own measurement.

Why it matters

The GX 550 is the new favorite of the overland crowd, and those owners spend a lot of hours on long highway drives to the trail. Factory base audio rarely keeps up with road and tire noise from all-terrain rubber. A reversible, plug-in amp upgrade that keeps everything Lexus designed into the dash is the kind of mod that suits a truck still under warranty.

Professional installation is available through Beat-Sonic's La Mirada, California headquarters and authorized installers, and the company says more Lexus applications are planned.