Diaphragm (Cone): Diameter 25-400 mm, Mass 0.5-50 g

Q: Why is the cone shape preferred over flat diaphragms in speakers?

The conical geometry provides optimal rigidity-to-weight ratio, reduces standing waves, and improves directivity control. It allows for progressive breakup modes at high frequencies rather than abrupt resonances, resulting in smoother frequency response and lower distortion.

Q: How does material choice affect speaker performance?

Material properties directly influence key parameters: lightweight materials (e.g., polypropylene) improve high-frequency response and efficiency, while stiff materials (e.g., metal composites) enhance midrange clarity and power handling. Internal damping characteristics affect transient response and harmonic distortion.

Component Specifications

Definition

The diaphragm (cone) is the primary moving component in a speaker driver, responsible for generating sound by vibrating in response to electrical signals from the amplifier. Its conical geometry optimizes rigidity, weight distribution, and piston-like motion to accurately reproduce audio frequencies while minimizing distortion. The cone's shape, material properties, and suspension system determine key acoustic parameters like frequency response, efficiency, and transient behavior.

Working Principle

The diaphragm operates on the electrodynamic principle: when an alternating current passes through the voice coil attached to the cone's apex, it interacts with the permanent magnet's magnetic field, creating mechanical force. This force causes the cone to oscillate back and forth, displacing air molecules to produce sound waves. The cone's geometry ensures uniform radiation and controlled breakup modes at high frequencies.

Materials

Common materials include: 1. Paper pulp (treated with resins for moisture resistance), 2. Polypropylene (injection-molded for consistency), 3. Aluminum or titanium alloys (for high stiffness-to-weight ratio), 4. Composite materials like carbon fiber-reinforced polymers. Material selection balances density, Young's modulus, internal damping, and environmental stability.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Mass	0.5-50 g
Diameter	25-400 mm
Compliance	0.1-2.0 mm/N
Cone Angle	60-120 degrees
Maximum Excursion	±1-10 mm
Resonant Frequency	20-2000 Hz

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

IEC 60268-5, ANSI/CEA-2034

Parent Products

This component is used in the following industrial products

Speaker Driver

The electroacoustic transducer that converts electrical audio signals into sound waves within a speaker system.

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Engineering Analysis

Risks & Mitigation

Resonance-induced distortion
Material fatigue under high excursion
Environmental degradation (humidity/temperature)
Geometric deformation during assembly

FMEA Triads

Trigger: Improper material selection or manufacturing defects
Failure: Cone breakup at lower frequencies causing harmonic distortion
Mitigation: Implement strict material testing (e.g., DMA analysis) and automated optical inspection during production

Trigger: Voice coil misalignment or overheating
Failure: Thermal deformation leading to rubbing or permanent cone damage
Mitigation: Design with thermal compensation features and precision alignment fixtures during assembly

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Diameter: ±0.1 mm, Concentricity: <0.05 mm TIR, Mass variation: ±2%

Test Method

Laser vibrometry for vibration analysis, acoustic measurement in anechoic chamber per IEC 60268-5, environmental cycling tests

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Diaphragm (Cone)

Manufacturer profiles associated with Diaphragm (Cone).

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

Why is the cone shape preferred over flat diaphragms in speakers?