400V MKP Metallized Polypropylene Film Capacitor — 0.1µF–33µF

MKP (Metallized Polypropylene) film capacitors are the audiophile-grade choice for tube amplifier coupling, speaker crossover networks, and audio filter circuits. The polypropylene dielectric delivers extremely low dissipation factor (DF), near-zero ESR, and negligible dielectric absorption — characteristics that translate directly to lower distortion and more accurate signal reproduction compared to electrolytic or polyester film capacitors. Rated at 400V DC with values from 0.1µF to 33µF, these capacitors cover the full range of crossover and coupling applications.

Key Specifications

Parameter	Value
Type	MKP — Metallized Polypropylene Film
Voltage Rating	400V DC
Capacitance Range	0.1µF – 33µF (select variant)
Tolerance	±5% or ±10% (varies by value)
Dissipation Factor (DF)	Very low (≤0.001 at 1kHz typical)
Dielectric Absorption	Negligible
Temperature Range	−40°C to +85°C
Lead Style	Radial (through-hole)
Application	Tube amplifier coupling, speaker crossover, audio filter
Origin	CN

MKP vs Other Capacitor Types for Audio

Feature	MKP (This Product)	Electrolytic	MKT (Polyester)
Distortion	✅ Extremely low	❌ High	❌ Moderate
ESR	✅ Near zero	❌ High	❌ Low-moderate
Dielectric Absorption	✅ Negligible	❌ Significant	❌ Low
Polarity	✅ Non-polarized	❌ Polarized	✅ Non-polarized
Size for same value	❌ Larger	✅ Compact	❌ Medium
Best Use	Coupling, crossover, signal path	Power supply filtering	General purpose

Typical Applications

Tube amplifier (valve amp) interstage and output coupling capacitors
2-way and 3-way passive speaker crossover capacitors (tweeter high-pass)
Audio preamplifier signal path coupling
Tone control and equalizer filter networks
Crossover upgrade replacement for electrolytic or polyester caps
Motor run capacitors in low-power AC applications

Frequently Asked Questions

Q: Can I use these in a speaker crossover with an 8Ω tweeter?

Yes. MKP capacitors are ideal for tweeter high-pass filters. For a first-order 3kHz crossover with an 8Ω tweeter: C = 1 / (2π × f × Z) = 1 / (2π × 3000 × 8) ≈ 6.6µF. Select the nearest standard value (6.8µF). The 400V rating provides ample headroom for typical home audio power levels.

Q: Are these oil-immersed capacitors?

These are metallized polypropylene film capacitors. Some larger values in this series use an oil-impregnated construction for improved voltage handling and reduced partial discharge — check the specific variant description for confirmation.