ESB Quattromila 4000 Series Review: Individual Components for Custom Car Audio Builds

The ESB Quattromila 4000 Series is Italian brand ESB's mid-tier car audio line sold as individual components rather than pre-packaged systems, giving custom installers flexibility to configure exactly the front stage they want. Six SKUs are available: the 4.28 tweeter (₹15,990), 4.75 midrange, 4.UMA mid-high unit (₹69,990), 4.165 mid-woofer (₹44,990), 4.6C coaxial (₹44,990), and 6.5-inch CNC grille (₹15,990). The ESB Quattromila 4000 Series is the entry into ESB's UMA-equipped speakers at a more accessible price than the higher tiers.

Key Takeaways

• Six individual SKUs — mix and match for custom 2-way, 3-way, or coaxial front stage configurations.

• 4.UMA combines 4.28 tweeter and 4.75 midrange in shared flange (₹69,990) — entry to UMA technology below flagship pricing.

• Die-cast aluminum alloy baskets, high-grade N52 neodymium magnets, silk domes and long-fiber cones throughout.

The Complete ESB Quattromila 4000 Series Component Lineup

ESB 4.28 — 1.1"/28mm Dome Tweeter (₹15,990): Sonatex silk dome, high-grade N52 neodymium magnet, extremely lightweight voice coil. 4Ω impedance, 100W/200W power handling, 1.5 kHz – 22 kHz frequency response, 93.5 dB sensitivity. Standalone tweeter for custom 2-way installations where you want to source the woofer separately.

ESB 4.75 — 3"/75mm Cone Midrange: Long fiber paper cone, die cast aluminum alloy basket, high-grade N52 neodymium magnet. 4Ω, 100W/200W power, 140 Hz – 12 kHz response. Designed to pair with the 4.28 tweeter in the 4.UMA configuration or standalone for 3-way builds.

ESB 4.UMA — 2-Way Mid-High Unit (4.28 + 4.75, ₹69,990): The pre-assembled UMA combining the 4.28 tweeter and 4.75 midrange in a single flange. Same UMA concept ESB uses in the flagship 8000 and 9000 series — co-locating tweeter and midrange eliminates phase timing errors at the crossover and simplifies A-pillar mounting. The 4.UMA is the entry point to ESB's UMA technology.

ESB 4.165 — 6.5"/165mm Mid-Woofer (₹44,990): Long-fiber unbleached pulp cone, die cast aluminum alloy basket, Y35 ferrite magnet. 4Ω impedance, 150W/300W power handling, 55 Hz – 6 kHz frequency response, 92.5 dB sensitivity. Designed to be crossed to the 4.UMA (or standalone tweeter+midrange) for 3-way builds, or paired with the 4.28 tweeter for 2-way configurations.

ESB 4.6C — 6.5"/165mm Coaxial Speaker (₹44,990): Silk dome tweeter, long-fiber unbleached pulp cone, die cast aluminum alloy basket, Y35 ferrite magnet. 4Ω, 100W/200W power, 55 Hz – 22 kHz response, 92.0 dB (tweeter) / 92.5 dB (woofer) sensitivity. For buyers who want ESB Quattromila 4000 Series quality but need factory-location coaxial installation.

ESB 6.5" Grille — CNC-machined 6.5" grille (₹15,990): Optional CNC-machined aluminum grille for the 4.165 mid-woofer or 4.6C coaxial. Adds visual finish and physical driver protection.

Why the ESB Quattromila 4000 Series Sells as Individual Components

Unlike the higher-tier Cinquemila (which ships as complete kits with crossovers), the Quattromila 4000 is designed for installers and audiophiles building custom systems. You might configure a 3-way front stage using the 4.UMA plus 4.165 mid-woofer with active DSP crossovers; a 2-way build using the 4.28 tweeter and 4.165 woofer with a custom passive crossover; or a coaxial upgrade using the 4.6C in factory door locations. The individual component approach costs more per driver but gives you engineering flexibility.

Common ESB Quattromila 4000 Series System Configurations

• 3-Way Front Stage with UMA: 4.UMA (₹69,990) + 4.165 mid-woofer pair (₹89,980) = ~₹1,59,970 for a complete audiophile 3-way front stage.

• 2-Way Front Stage with Standalone Tweeter: 4.28 tweeter pair (₹31,980) + 4.165 mid-woofer pair (₹89,980) = ~₹1,21,960. Passive crossover sold separately.

• Coaxial Rear Fill: 4.6C pair (₹44,990) as rear-fill speakers matching a Quattromila front stage.

Amplifier and DSP Recommendations

The Quattromila 4000 Series is engineered for aftermarket amplification. The 4.165 mid-woofer at 150W RMS handling and the 4.75 midrange at 100W RMS both benefit from real amp power (60-100W RMS per channel matched to load impedance). For active 3-way builds using the 4.UMA plus 4.165, a DSP with active crossover capability is essential — read our Onkyo R-MS66 DSP review for a budget-tier processor with active crossover support.

The Bottom Line on the ESB Quattromila 4000 Series

The ESB Quattromila 4000 Series is the right choice for installers and audiophiles building custom car audio systems from individual components. Six SKUs — tweeter, midrange, UMA, mid-woofer, coaxial, and grille — give you the flexibility to configure exactly the 2-way, 3-way, or coaxial front stage your build requires. The 4.UMA specifically is the affordable entry point to ESB's flagship UMA technology, bringing phase-coherent driver co-location down to a mid-tier price. For Italian audiophile engineering at accessible pricing, the Quattromila 4000 delivers.