The ESB 8.6K3U is a high-end 3-way speaker system that uses the UMA concept to optimize midrange/high output while maintaining a compact layout. It blends the woofer/middriver into a configuration that enhances integration, soundstage, and dispersion. Built with ESB’s premium materials and design philosophy, it is suited for audiophile-level installs where clarity, staging, and dynamic range matter most.
System Type:
• 3-way component speaker set using UMA (Unit Medium High) configuration
• Designed for high-fidelity sound staging and compact installation
Power / Input Specs:
• Continuous Power Handling (RMS): 160 W
• Maximum Power: 320 W
• Nominal Impedance: 4 Ω
• Sensitivity: ~89 dB (system average)
Driver Components:
• Woofer / Midrange Unit (shared)
– Likely similar architecture to ESB 8.165 (6.5")
– Voice coil size: 32.4 mm
– Progressive spider, rigid cone design
• Midrange / UMA Unit
– UMA means a combined midrange / mid-high driver in one unit
– Covers the middle/high frequency band in the 3-way setup
• Tweeter / High-Frequency Unit
– 28 mm dome tweeter (soft dome, heat-resistant material)
– Designed to reproduce 3,000+ Hz to 25,000+ Hz
Crossover / Filtering:
• 3-way passive crossover or optional active DSP configuration
• Typical crossover frequencies:
– Woofer to Mid: ~300–500 Hz
– Mid / UMA to Tweeter: ~3.5 kHz
• Slope options and attenuation controls likely provided for tuning in car cabin
Physical / Mechanical Specs:
• Mounting Depth (Woofer): ~68 mm
• Mounting Hole Diameter: ~144 mm
• Overall Weight (system): ~4.5 kg
• Full Frequency Response: 45 Hz – 25,000 Hz
• Other parameters:
– DC resistance (Re): 2.2 Ω
– Resonant frequency (Fs): ~62.7 Hz
– Xmax (peak excursion): ±14.6 mm
