ESX SXT8D2

The ESX SIGNUM SXT8D2 is a powerful 20 cm (8-inch) subwoofer that, despite its compact dimensions, impresses with its high-quality construction and high power handling. At its heart is the generously sized 50.8 mm dual voice coil with a winding height of 27.1 mm. Together with the powerful dual magnet assembly totaling 48 ounces, it ensures powerful drive and controlled bass reproduction.

The meticulously crafted paper cone, the sturdy rubber surround, and the durable centering spider ensure precise cone movement. A vented pole piece aids heat dissipation under higher loads. With 250 watts RMS and a dual voice coil rated at 2+2 ohms, the SXT8D2 is suitable for various amplifier configurations and compact subwoofer enclosures.

Technical Specifications

General Characteristics

• Manufacturer: ESX

• Model: SXT8D2

• Series: SIGNUM SXT

• Product Type: Subwoofer Driver

• Nominal diameter: 20 cm (8 inches)

• RMS Power Handling: 250 watts

• Maximum power handling: 500 watts

• Recommended amplifier power: 200–300 watts RMS

• Impedance: 2+2 ohms

• Voice coils: 2 (dual voice coil)

• Voice coil diameter: 50.8 mm

• Voice coil height: 27.1 mm

• Frequency range: 30–300 Hz

• Sensitivity: 83 dB (1 W/1 m)

• Manufacturer's specification for sound pressure level: 86 dB (2.83 V/1 m)
  
  

Diaphragm and Actuator

• Diaphragm material: Handmade, unpressed paper diaphragm

• Bead: Rubber

• Dust-proof cap: Injection-molded polypropylene (PP)

• Basket material: Steel

• Centering Spider: Single Conex Spider

• Voice coil former: Kapton

• Magnet type: Double magnet, ferrite Y25

• Magnet weight: 2 × 24 oz. (approx. 1.36 kg total)

• Magnet dimensions: Ø 110 × 40 mm

• Core: Ventilated

• Linear diaphragm stroke (Xmax): ±10.5 mm

• Maximum mechanical diaphragm stroke (peak): ±19 mm

• Effective membrane area (Sd): 227 cm²

• Moving mass (Mms): 83.2 g
  
  

Thiele-Small parameters

• Resonance frequency (Fs): 34 Hz

• Overall Quality (Qts): 0.56

• Electrical quality (Qes): 0.60

• Mechanical Quality (Qms): 7.9

• Equivalent air volume (Vas): 19 liters

• DC resistance (Re): 2+2 ohms (manufacturer's specification)

• Voice coil inductance (Le): 3.2 mH

• Power Factor (BL): 10.9
  
  

Installation Dimensions

• Outer diameter: 210 mm

• Installation opening: 182 mm

• Installation depth: 123 mm

• Shipping weight according to the data sheet: 3.9 kg
  
  

Recommended Cases

• Sealed enclosure: 10–20 liters

• Lower cutoff frequency (F3), closed: 42 Hz

• Bass-reflex enclosure: 20 liters

• Bass reflex tuning frequency (Fb): 42 Hz

• Lower cutoff frequency (F3), bass reflex: 34 Hz

• Bass reflex port diameter: 80 mm

• Bass reflex port cross-sectional area: 50 cm²

• Bass reflex port length: 350 mm
  
  

Connection Options

• Voice coils in parallel: 1 ohm total impedance

• Voice coils in series: 4 ohms total impedance