250V FPP Metallized Polypropylene Film Audio Capacitor — 1.0µF–18µF

FPP (Film Polypropylene) metallized capacitors are the audiophile standard for speaker crossover networks and tube amplifier coupling stages. The polypropylene dielectric delivers near-zero dissipation factor, negligible dielectric absorption, and a non-polarized construction — making them a direct upgrade over electrolytic capacitors in any signal-path application. Rated at 250V DC with values from 1.0µF to 18µF, this range covers tweeter high-pass and midrange bandpass crossover sections as well as interstage coupling in valve amplifiers.

Key Specifications

Parameter	Value
Type	FPP — Metallized Polypropylene Film
Voltage Rating	250V DC
Capacitance Range	1.0µF – 18µF (select variant)
Tolerance	±5% or ±10%
Dissipation Factor	Very low (≤0.001 at 1kHz)
Dielectric Absorption	Negligible
Polarity	Non-polarized
Package	Radial through-hole
Temperature Range	−40°C to +85°C
Application	HiFi speaker crossover, tube amp coupling, audio filter
Origin	CN

FPP vs Electrolytic vs MKT for Audio

Feature	FPP (This Product)	Electrolytic	MKT Polyester
Distortion	✅ Extremely low	❌ High	❌ Moderate
Dielectric Absorption	✅ Negligible	❌ Significant	❌ Low
Polarity	✅ Non-polarized	❌ Polarized	✅ Non-polarized
ESR	✅ Near zero	❌ High	❌ Low-moderate
Best Use	Signal path, crossover, coupling	Power supply filtering	General purpose

Typical Applications

2-way and 3-way passive speaker crossover tweeter high-pass capacitors
Tube amplifier (valve amp) interstage and output coupling
Audio preamplifier signal path coupling and tone control networks
Crossover upgrade: replace electrolytic caps with FPP for audible improvement
HiFi frequency divider networks in DIY speaker builds

Frequently Asked Questions

Q: What value do I need for a 3kHz tweeter crossover at 8Ω?

For a first-order (6dB/oct) high-pass: C = 1 / (2π × f × Z) = 1 / (2π × 3000 × 8) ≈ 6.6µF. Select 6.8µF. For a second-order Butterworth, use a crossover calculator to determine the exact L and C values.

Q: Can I use 250V capacitors in a tube amplifier with 300V B+?

No. Always select a capacitor with a voltage rating at least 20–50% above the maximum circuit voltage. For 300V B+ supplies, use 400V or 630V rated capacitors in the signal path.