The "Bass Freq Test Generator" is a tool for audio testing and speaker setup. It generates bass tones (20Hz to 100Hz) with adjustable frequency, duration (1-20 seconds), and gain (0-100%), playable as sine waves or pink noise. Users can save favorite settings for quick recall. The tool also includes a Speaker Phase Tester, which tests front and rear speakers with pulse frequencies (20Hz to 2000Hz), adjustable gain, and pulse speed (200-2000ms). It allows phase inversion for each speaker (front left/right, rear left/right) and visualizes active speakers on a car diagram. A waveform canvas displays the tone, and a countdown timer tracks playback duration. The interface supports mobile use with haptic feedback and ensures browser audio compatibility.