This document is the user manual for Yamaha XS350, XS250 power amplifiers, and it describes the features and functions of this amplifier series.
This manual covers safety precautions, proper power‑cord connection, and ventilation requirements to prevent fire or electric shock. It also explains how to install the amplifier in standard or EIA racks and how to connect speakers using either binding posts or parallel wiring.
The guide describes the front‑panel controls, rear‑panel connectors, operation modes (stereo, parallel, bridge), adjustable high‑pass filter, indicator LEDs for signal, clipping and protection, and troubleshooting tips. Technical specifications such as output level thresholds, filter range, and minimum speaker impedance are listed. This manual is written in Chinese.
| High‑pass filter adjustable range | 25 Hz – 150 Hz |
|---|---|
| Signal level indicator threshold | 2 Vrms |
| Clip detection threshold | Distortion >12 % |
| Minimum speaker impedance (bridge) | 8 Ω |
Connect the power cord to the AC inlet described in the manual and avoid placing heavy objects on the cord to prevent fire or electric shock.
Select the LOW CUT position and rotate the frequency knob to adjust the cutoff frequency between 25 Hz and 150 Hz.