A web-based tool for designing and simulating RLC crossover networks for In-Ear Monitors (IEMs). Upload driver data, build crossovers, and visualize how they affect the final sound with accurate ear canal simulation.

The simulator uses electrical and acoustic principles to model your IEM system:

1. Driver Impedance - Reads complex impedance (magnitude and phase) from your .zma file and interpolates between data points.

2. Ear Canal Simulation - Adds IEC 711 standard acoustic impedance to model the ear canal's transmission line effect.

3. Component Impedance - Calculates impedance for each component at every frequency:

   • Capacitor: Z_C = 1 / (j × 2πf × C)
   • Inductor: Z_L = j × 2πf × L
   • Resistor: Z_R = R

4. Total Impedance - Combines all impedances using circuit rules (series: Z_total = Z₁ + Z₂ + ..., parallel: 1/Z_total = 1/Z₁ + 1/Z₂ + ...).

5. Transfer Function - Calculates the voltage divider formed by the crossover and driver/ear load.

6. Final SPL - Applies the transfer function's attenuation to the driver's raw frequency response from the .frd file.

7. Summation - Converts all drivers' SPL to linear pressure (respecting polarity), sums them, and converts back to dB.

• Node.js (version 14 or higher)

# Clone the repository
git clone https://github.com/DriftingOtter/iem-crossover-simulator.git
cd iem-crossover-simulator

# Install dependencies
npm install

# Start development server
npm start

Opens at http://localhost:3000

npm run build

Space or tab-separated: Frequency(Hz) SPL(dB)

20    45.2
25    48.1
31.5  51.3

Space or tab-separated: Frequency(Hz) Impedance(Ohm) Phase(degrees)

20    8.5    -15.2
25    8.3    -12.1
31.5  8.2    -9.8

Note: First row should be data (no headers). Phase in degrees, not radians.

1. Go to Settings → Pages
2. Under Source, select GitHub Actions
3. Push to main branch

Live at: https://driftingotter.github.io/iem-crossover-simulator/

npm run deploy

Then go to Settings → Pages, select Deploy from a branch, choose gh-pages branch and / (root) folder.

• React 18 - UI framework
• Tailwind CSS v3 - Styling
• Recharts - Charts and visualization
• Lucide React - Icons
• Create React App - Build tooling

This tool was created with AI assistance. While calculations are based on established electrical and acoustic principles, verify results with other tools or measurements when possible. Simulation accuracy depends on input data quality. Use at your own risk and always test physical builds carefully.

This project is licensed under the GNU General Public License v3.0 - see the LICENSE file for details.