HELIX PURE P 6B

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88dB
• Frequency response 40 - 4000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 56Hz
• Mechanical quality factor QMS 5.48
• Electrical quality factor QES 0.54
• Total quality factor QTS 0.49

Large signal parameters

• Maximum linear excursion xmax 3mm
• Air volume displaced at xmax VD 39cm³
• Power handling P 100W
• Program power Pmax 200W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.5Ω
• Inductance (1kHz, estimated) LE 0.46mH
• VC Diameter 25mm
• Winding height HVC 12mm

Magnet

• Force factor Bl 5.7N/A
• Motor constant Bl/√RE 3.05N/√W

Diaphragm

• Effective diameter 128mm
• Effective area SD 129cm²
• Moving mass MMS 14.3g
• Moving mass (without air load) MMD 13.2g

Suspensions

• Stiffness KMS 1.75N/mm
• Compliance CMS 571µm/N
• Equivalent volume to the compliance VAS 13.2L
• Mechanical resistance RMS 0.91N·s/m

Dimensions

• Nominal diameter 6.5″
• 165mm
• Overall diameter 166mm
• Baffle cutout diameter 142mm
• Mounting depth 67mm
• Volume occupied by the driver (estimated) 0.51L