Passive Crossover Design And Verification Workflow

Use one sheet per driver set, board revision, and final installation. Keep the model, component measurements, prototype, acoustic data, thermal data, and approved settings tied together.

Project Contract

Vehicle / enclosure / baffle:

Drivers / samples / serials:

Amplifier / channel mode / minimum load:

Target axis / seats / listening window:

Passband / max level / duration:

Driver Electrical Data

Impedance fixture / level / date:

Re / nominal / minimum Z:

Impedance phase / resonances:

Cold / warm state:

Files / calibration / cable R:

Driver Acoustic Data

Microphone / calibration / coordinates:

Timing reference / gate / smoothing:

Magnitude / phase file names:

Distortion / compression / level:

Horizontal / vertical / seat traces:

Acoustic Target

Candidate crossover region:

Low-driver target slope / level:

High-driver target slope / level:

Polarity / normal sum / reverse sum:

Directivity / listening-window goal:

Network Topology

Low branch topology:

High branch topology:

Compensation branches:

L-pad / level controls:

Baffle / diffraction compensation:

Component Record

Inductors: L / DCR / core / Irms / Isat:

Capacitors: C / ESR / dielectric / V / current:

Resistors: R / tolerance / average / pulse:

Measured values and temperature:

Supplier / lot / substitution rules:

Simulation And Tolerance

Software / model revision:

Source / cable / DCR / ESR assumptions:

Cold and hot Re cases:

Component tolerance extremes:

Minimum Z / target / power sensitivities:

Board Layout

Board / revision / dimensions:

Inductor orientation and spacing:

Hot-component clearances:

Wire / trace / terminals / strain relief:

Mounting / vibration / service access:

Electrical Verification

Continuity / polarity / component values:

Network input impedance / minimum:

Amplifier-terminal source voltage:

Low-driver terminal transfer:

High-driver terminal transfer:

Acoustic Verification

Low driver through network:

High driver through network:

Normal-polarity sum:

Reverse-polarity sum:

Off-axis / nearby-seat results:

Thermal And High-Level Test

Signal / crest / voltage / duration:

Resistor temperatures / power:

Inductor temperature / saturation evidence:

Capacitor temperature / voltage / current:

Compression / response drift / recovery:

Final Installed Signoff

Grille / trim / adapter / wiring state:

Final impedance and acoustic files:

Approved max source / amplifier state:

First limiting condition:

Reviewer / date / revision:

Stop And Rework If

☐ network impedance is below the amplifier's verified limit
☐ driver-terminal transfer does not match the modeled topology
☐ normal or reverse acoustic summation cannot be explained from the individual traces
☐ off-axis or nearby-seat behavior fails the design contract
☐ resistor, inductor, capacitor, board, terminal, or wiring temperature is unacceptable
☐ the network compresses, saturates, changes value, or creates noise at the target level
☐ final trim, grille, baffle, or production tolerance invalidates the prototype result

Starting Equations

First-order high-pass: C = 1 / (2π f R)
First-order low-pass:  L = R / (2π f)

L-pad start:
K = 10^(A_dB / 20)
Rseries = Z × (K - 1) / K
Rshunt = Z / (K - 1)

Resistive dissipation:
P = I²R = V²/R

Every equation above requires a stated impedance and operating condition. Replace nominal assumptions with measured network data before final approval.