Gladen Sigma 165-X

The Gladen Sigma 165-X is a high-quality 165 mm (6.5-inch) coaxial coincidence speaker that impresses with its precise sound reproduction, high power handling, and innovative speaker design. Thanks to the single-point principle, the 19 mm silk dome tweeter is positioned directly at the acoustic center of the mid-bass driver. This arrangement enables exceptionally uniform sound dispersion, stable phase alignment, and a detailed, spatial soundstage.

The newly developed HEXATEC compound diaphragm, combined with a high-performance ferrite magnet system and a generously sized 38 mm voice coil, ensures dynamic, controlled sound reproduction. With a resonance frequency of 49.2 Hz and a total Q factor of 0.41, the speaker is ideally suited for installation in vehicle doors and compact mounting spaces. Precise bass response, a clean fundamental tone, and finely resolved highs characterize the sound tuning.

The sturdy aluminum basket, the durable Nomex suspension, and the flexible SBR rubber surround ensure reliable performance even at higher volume levels. With a nominal impedance of 3 ohms and a power handling capacity of 175 watts RMS, the Sigma 165-X offers ideal specifications for high-end car audio systems.

Technical Specifications

General Characteristics

• Manufacturer: Gladen

• Model: Sigma 165-X

• Product Line: Sigma

• Speaker Type: 2-way coaxial coincident speaker

• Speaker size: 165 mm (6.5 inches)

• Design: Single-point coaxial system

• Nominal impedance: 3 ohms

• Rated Power Handling (RMS): 175 watts

• Maximum power handling: 250 watts

• Sensitivity: 88 dB (1 W / 1 m)

• Sensitivity at 2.83 V / 1 m: 92 dB
  
  

Low-midrange driver

• Diameter: 165 mm

• Membrane material: HEXATEC paper-composite membrane

• Centering spider: Nomex

• Bead material: SBR rubber

• Voice coil diameter: 38 mm

• Voice coil former: fiberglass

• Magnetic material: Ferrite

• Speaker basket: Aluminum

• Dust-proof cap: Polyurethane (PU)

• Design: Long-throw low-midrange driver
  
  

Tweeter

• Design: Coaxially integrated dome tweeter

• Diameter: 19 mm

• Diaphragm material: silk

• Voice coil diameter: 19 mm

• Voice coil former: fiberglass

• Magnet material: Neodymium

• Positioning: At the acoustic center of the low-midrange driver
  
  

Thiele-Small parameters

• Resonance frequency (Fs): 49.2 Hz

• DC resistance (Re): 2.57 ohms

• Nominal impedance (Z): 3.00 ohms

• Mechanical Quality (Qms): 3.99

• Electrical quality (Qes): 0.46

• Total quality (Qts): 0.41

• Equivalent air volume (Vas): 16.2 liters

• Effective membrane area (Sq): 135 cm²

• Moving mass (Mms): 15.4 g
  
  

Installation Dimensions

• Outer diameter: 167 mm

• Installation diameter: 144 mm

• Installation depth: 68 mm

• Mounting holes: 4.5 mm in diameter
  
  

What's Included

• 2 × Gladen Sigma 165-X coaxial coincident speakers (165 mm)

• 1 × Product Documentation / Installation Instructions