BALD GUYS GARAGE · AUDIO LAB
Record your stereo.
Play the pink-noise test track through the motorcycle from another device. This iPhone measures the sound.
Speaker setup
Park the bike, turn the engine off, and hold the microphone near your ears. Use the same position and radio volume for every pass.
Settings are saved separately for each DSP / EQ section / output in this browser.
Speakers by output · optional
Assign each connected speaker below. Choose No speaker / unused for empty outputs, or Unknown / not listed to continue without a model. Select a DSP output above to review its EQ and crossover guidance.
Selected output: type and mounting · optional
Skip these fields to use spectrum, EQ and polarity tests. These details improve guidance for the selected output; models are assigned in the eight rows above.
No calibration loaded. Phone results are provisional; level is dBFS, not sound-pressure level.
Measurement notes
Use a quiet environment and switch off radio sound effects. Keep crossovers and amplifier gains unchanged. Measure speaker groups separately only after selecting them in the DSP app. The analysis uses octave-band power with pink noise, normalized to the midrange. It is a tonal check, not a gain, phase, delay, or limiter calibration.
Crossover starting points
Starting points for every speaker model or type assigned in setup. Matching speakers are grouped with their output numbers. Manufacturer frequency-response limits are not crossover recommendations.
Selected output crossover
This only fills the fields in SKS. Apply changes manually in your DSP, then remeasure. Initial frequency guidance is not yet optimized from your recordings.
Output crossover range
Enter the selected output’s existing HPF and LPF. SKS excludes bands near and outside these limits from EQ suggestions. These fields document your settings; they do not change the DSP.
Check one speaker
Play the SKS polarity pulse track from the device connected to the motorcycle. In the DSP, play only the output being tested. Point the phone microphone close to that speaker and keep it still.
Select a speaker and play the pulse track. Pink noise is for the spectrum tab.
Establish a known-correct reference
Before SKS can suggest a polarity change, capture a speaker whose wiring and DSP polarity are verified correct. Use the same speaker model, recorded EQ and crossover settings, microphone, and close microphone position as the speaker being checked. A reference can be reused for matching outputs. If those settings change, capture a matching reference again.
Experimental acoustic polarity check, not a time-alignment measurement. The microphone and detection method still need validation on the shop system. A frequency calibration file alone does not verify microphone polarity. SKS uses a known-correct captured pulse as its reference and withholds recommendations when pulses are weak, clipped, inconsistent, or unlike the reference.
Speaker polarity comparison
Test one speaker against a reference speaker using the same pink-noise signal. Play only that pair. Record the normal setting, then reverse only the test speaker’s polarity in the DSP and record again.
Use the background capture and Measure buttons below for each pass. Keep phone position, radio volume, EQ and crossovers unchanged. Repeat A and B for more confidence.
No polarity comparison yet.
This is a relative acoustic polarity check at the mic position. It does not prove absolute wiring polarity or verify time alignment. Compare speakers with overlapping frequency ranges. DSP changes remain manual; restore the original setting if the result is inconclusive.
Record the test signal
Keep the engine off and the phone still near the rider’s ears. First measure background noise with the stereo silent, then play the test track from your other device.
No background sample yet. Capture one before each measurement.
Get the pink-noise test track
Download this WAV on the device connected to the bike. Start at low volume. Keep the volume fixed for both measurements.
Playback-only preview does not open the microphone. This phone records only during measurements.
Live spectrum & response
Overlay the recorded spectrum with the expected pink-noise levels. Equal logarithmic bands should carry roughly equal energy; taller bands indicate more energy at the microphone.
Play pink noise from the separate device. Live readings are relative, uncalibrated unless a mic calibration file is loaded, and do not generate EQ suggestions.
The full spectrum fits your screen. Select a band below to inspect its frequency, gain, and Q.
Input EQ settings
Band 1 · 20 HzThe initial 0 dB / Q 4.32 values are a draft, not a reading from your DSP. Edits here only record settings; apply final changes in your DSP app.
Numbered 31-band layout follows your Marts BTX8 screenshots. DS18 uses the same layout per your confirmation. Set EQ IN or EQ OUT and record existing band settings before requesting changes. The screenshot’s “31” label corresponds to the standard 31.5 Hz band.
Suggested outputs list
Take a measurement to see the response. No sample data is shown.
Each pass suggests at most three separated filter cuts to limit overlapping corrections. Save your original DSP preset. Apply changes in the DS18 app, then return here and remeasure. Results stay in this browser; exporting creates a backup.