Wavecor WF118WA07 4½" mid/woofers papercone 4ohm

WF118WA07 (4 ohm) and WF118WA08 (8 ohm) are 4½" mid/woofers designed for demanding bass and midrange applications. They work equally well for hi-fi, high quality home theater systems, multimedia setups, or high quality personal audio systems.
With the new SLIM-line frame design and a new suspension optimized for high-level bass output, these units are perfectly suited for compact high performance speakers.

• FEA optimized suspension for perfect symmetry, reducing even order harmonic distortion
• Balanced Drive motor with perfect force factor symmetry for reduced distortion
• Alu field-stabilizing ring inside magnet assembly for reduced distortion at high levels
• Vented voice coil former for reduced distortion and compression
• Vented chassis for lower air flow speed reducing audible distortion
• Heavy-duty black fiber glass voice coil bobbin to increase power handling and reduce mechanical losses resulting in better dynamic performance and low-level details
• Large motor system with 1¼” voice coil diameter and 80 mm magnet for better control and efficiency
• Progressive suspension with optimized compromise between linearity and soft clipping
• Suspension with CONEX damper (spider) for long durability under extreme operating conditions
• Gold plated terminals to prevent oxidation for long-term reliable connection
• Delivered with foam gasket attached to the frame for hassle-free mounting and secure enclosure sealing
  

• Notes

  	Parameter	WF118WA07		WF118WA08		Unit
  		Before burn-in	After burn-in	Before burn-in	After burn-in
  	Nominal size	4½		4½		[inch.]
  	Nominal impedance	4		8		[ohm]
  	Recommended max. upper frequency limit	3		3		[kHz]
  1, 4	Sensitivity, 2.83V/1m (average SPL in range 200 - 2,000 Hz)	87		84		[dB]
  2, 4	Power handling, short term, IEC 268-5, no additional filtering					[W]
  2, 4	Power handling, long term, IEC 268-5, no additional filtering					[W]
  2	Power handling, continuous, IEC 268-5, no additional filtering					[W]
  	Effective radiating area, Sd	54		54		[sq.cm]
  3, 4, 6	Resonance frequency (free air, no baffle), Fs	56		58		[Hz]
  	Moving mass, incl. air (free air, no baffle), Mms	6.9		6.5		[g]
  3, 4	Force factor, Bxl	4.5		5.8		[N/A]
  3, 4, 6	Suspension compliance, Cms	1.18		1.18		[mm/N]
  3, 4, 6	Equivalent air volume, Vas	4.9		4.9		[lit.]
  3, 4, 6	Mechanical resistance, Rms	0.31		0.31		[Ns/m]
  3, 4, 6	Mechanical Q, Qms	7.8		7.6		[-]
  3, 4, 6	Electrical Q, Qes	0.38		0.45		[-]
  3, 4, 6	Total Q, Qts	0.36		0.42		[-]
  4	Voice coil resistance, RDC	3.2		6.4		[ohm]
  5	Voice coil inductance, Le (measured at 10 kHz)	0.22		0.36		[mH]
  	Voice coil inside diameter	26		26		[mm]
  	Voice coil winding height	12		12		[mm]
  	Air gap height	4		4		[mm]
  	Theoretical linear motor stroke, Xmax	±4		±4		[mm]
  	Magnet weight					[g]
  	Total unit net weight excl. packaging					[kg]
  3, 4, 5	Krm	0.81		1.34		[mohm]
  3, 4, 5	Erm	0.79		0.79		[-]
  3, 4, 5	Kxm	3.6		5.5		[mH]
  3, 4, 5	Exm	0.73		0.74		[-]