The ESB 4.UMA is a compact 2-way mid/high unit combining a 3.5″ midrange drive section and 1.1″ tweeter into a unified design. This integration optimizes phase, minimizes internal delays, and enhances imaging. With refined materials and ESB’s acoustic engineering, the 4.UMA is ideal for custom interiors or locations with limited space where full mid/high performance is required without separate component separation.
Specifications / Features:
• Model: 4.UMA
• Type: 2-Way Mid-High “Unit” (combined midrange + tweeter)
• Nominal Impedance: 4 Ω
• Power Handling (RMS): 80 W
• Peak Power Handling: 160 W
• Frequency Response: 250 Hz – 25,000 Hz
• Sensitivity: 94 dB @ 2.83 V / 1 m
Driver Construction / Design:
• Midrange Driver (3.5″ / ~90 mm):
– Cone: Lightweight composite cone (rigid and damped)
– Surround: Rubber surround for controlled excursion
– Voice Coil: Aluminum former with copper winding
– Spider: Balanced spider for reliable compliance and excursion
– Basket: Aluminum frame, optimized for low turbulence
• Tweeter (1.1″ / 28 mm dome):
– Dome material: Silk or treated textile dome for smooth response
– Voice coil: Aluminum or aluminum-copper clad with copper winding
– Magnet: Neodymium motor system
– Venting / cavity damping to reduce resonances
Integration Features:
• UMA design ensures optimal time alignment between midrange and tweeter
• Integrated flange for compact mounting and precise driver centering
• Shared terminals for simplified wiring between midrange and tweeter
• Matching grille or protective mesh typically included
Mechanical / Mounting Specs:
• Overall Diameter: Approx. 4.5″ (115 mm)
• Mounting Depth: ~2.0″ (50 mm)
• Cutout Diameter: ~3.8″ (96 mm)
