ESX QXE12D2

The ESX QXE12D2 from the QUANTUM series is a high-performance 30-cm subwoofer designed to deliver high bass levels and precise low-frequency reproduction.

Its specially designed cast aluminum basket provides ample centering for large diaphragm deflections. The sophisticated ventilation of the centering spider, voice coil, and pole piece improves heat dissipation and reduces compression under high loads.

Power is provided by two powerful 100-oz. magnets combined with a 76-mm dual voice coil mounted on a black anodized aluminum frame. The 40-mm-high voice coil enables a linear diaphragm excursion of ±14 mm and a maximum mechanical excursion of ±22 mm.

The paper cone with a double-stitched foam surround ensures high stability and delivers powerful, controlled bass even at high volumes.

Technical Specifications

General Characteristics

• Manufacturer: ESX

• Model: QXE12D2

• Series: QUANTUM QXE

• Product Type: Subwoofer

• Nominal diameter: 30 cm (12 inches)

• RMS Power Handling: 1,000 watts

• Maximum power handling: 2,000 watts

• Impedance: 2 × 2 ohms (dual voice coil)

• Terminal impedance in a parallel connection: 1 ohm

• Terminal impedance in series connection: 4 ohms

• Sensitivity (SPL): 87 dB (1 W/1 m)
  
  

Diaphragm and Actuator

• Diaphragm material: Handmade paper

• Piping: Foam, double-stitched

• Basket material: Cast aluminum basket

• Voice coil diameter: 76 mm (3 inches)

• Voice coil winding: 40 mm height

• Voice coil former: Black anodized aluminum

• Magnetic drive: Dual magnet, 2 × 100 oz.

• Magnet weight: approx. 5.6 kg

• Magnetic material: Ferrite (Y30)

• Ventilation: Ventilated pole core and T-plate

• Centering spider: Rear-vented

• Linear diaphragm stroke (Xmax): ±14 mm

• Maximum mechanical diaphragm stroke: ±22 mm

• Effective membrane area (Sd): 510 cm²

• Moving mass (Mms): 319 g
  
  

Thiele-Small parameters (TSP)

• Resonance frequency (Fs): 34 Hz

• Total quality (Qts): 0.36

• Electrical quality (Qes): 0.38

• Mechanical Quality (Qms): 5.29

• Equivalent volume (Vas): 25 liters

• DC resistance (Re): 2 × 1.9 ohms

• Voice coil inductance (Le): 2.6 mH
  
  

Installation Dimensions

• Outer diameter: 325 mm

• Installation diameter: 285 mm

• Installation depth: 185 mm
  
  

Case Recommendations According to ESX

Bass-reflex enclosure – Sound quality

• Net volume (Vb): 55 liters

• Tuning frequency (Fb): 34 Hz

• Lower cutoff frequency (F3): 29 Hz

• Bass reflex port diameter: 130 mm

• Bass reflex tube length: 50 cm
  
  

Bass-reflex enclosure – SPL

• Net volume (Vb): 65 liters

• Tuning frequency (Fb): 43 Hz

• Lower cutoff frequency (F3): 35 Hz

• Bass reflex ports: 2 × 100 mm in diameter

• Bass reflex tube length: 26 cm each