Subwoofer Test &
Calibration Studio.
Test sub-bass extension, crossover behavior, polarity, phase interaction, gain matching, room modes, and listening-position response directly in your browser.
Test Your
Low End.
Use the controls below to generate low-frequency tones, sweeps, crossover checks, and polarity tests. Start at a very low listening level.
Estimate Your
Room Resonances.
Enter room dimensions to estimate the first three axial modes for length, width, and height.
How To Use
The Tests.
Turn the subwoofer and monitor levels down. Start around -30 dB digital level and raise slowly.
Play 20, 30, 40, 50, 60, and 80 Hz. Listen for sudden level jumps, disappearing notes, rattles, or distortion.
Run the crossover test around your selected crossover frequency. Listen for a dip or hump where the sub and mains overlap.
Compare normal and inverted polarity at the crossover frequency. Use the position that produces the strongest, smoothest combined response at the listening position.
Walk around the room during a slow sweep. Large level changes indicate standing waves and room-mode problems.
What Problems
Sound Like.
A narrow room resonance or crossover bump makes several bass notes sound like the same pitch.
A cancellation null may exist at the listening position. Moving the sub or chair can help more than EQ.
The sub and mains may be out of phase or physically misaligned around the crossover point.
Reduce level immediately. The driver, port, cabinet, furniture, or room structure may be resonating.
Tighter Bass.
Better Translation.
Use controlled low-frequency tests to improve subwoofer placement, crossover alignment, polarity, and room response.