Car Audio Tools & Calculators
Free, practical tools for every install — design a subwoofer box, size an amplifier, work out speaker impedance, pick the right wire gauge, estimate loudness, and dial in a crossover.
Subwoofer Box Calculator
Design a sealed or ported enclosure — net internal volume for one or more subs, the vented-box port length that tunes a ported box to your target frequency, and external cabinet dimensions from your panel thickness
Amplifier Power (RMS) Calculator
Match an amp to your speakers by RMS — get a recommended amp power range with headroom, an under/matched/over verdict for an amp you're considering, and how power scales as impedance drops
Speaker Impedance Calculator
Total impedance for speakers or voice coils wired in series, parallel, or series-parallel — dual-voice-coil subs included — with a warning when the load falls below what most amps can safely drive
Amplifier Wire Gauge Calculator
Pick the right power and ground wire gauge (AWG) from your amp's RMS output or fuse rating and the run length — with the estimated current draw and a suggested inline fuse to protect the wire
SPL (Loudness) Calculator
Estimate how loud a speaker plays from its sensitivity, power, and your distance — sound pressure level in dB, with +3 dB per doubling of power and free-field distance loss, plus a real-world loudness reference
Crossover Calculator
Component values for a passive first- or second-order crossover — the high-pass capacitor for the tweeter and the low-pass inductor for the woofer — from your crossover frequency and driver impedance