SW223BD01




	The 8¾” transducer SW223BD01 was designed specifically for high performance compact subwoofer applications where sound quality and low distortion are the priorities.

Frequency resp. Specifications Dimensions Ordering info

		FEATURES

Balanced Drive motor structure for optimal drive force symmetry resulting in largely reduced even order harmonic distortion
Extremely large linear stroke, Xmax = ± 10.7 mm, ensuring low distortion at high output levels
Very rigid black aluminium cone to ensure piston motion at high levels and for better heat transfer at high continuous power levels
Rigid die cast alu chassis with extensive venting for lower air flow speed reducing audible distortion
Heavy-duty black fiber glass voice coil former to reduce mechanical losses resulting in better dynamic performance and low-level details
Large motor with 2” voice coil diameter for better control and power handling
Built-in alu field-stabilizing ring for reduced distortion at high levels
Low-loss suspension (high Qm) for better reproduction of details and dynamics
Black plated cone and motor parts for better heat transfer to the surrounding air
Conex spider for better durability under extreme conditions
Gold plated terminals to ensure long-term trouble free connection


	FREQUENCY RESPONSE


	Measuring conditions, SPL Driver mounting: Flush in infinite baffle, back side open (no cabinet) Microphone distance: 1.0 m Input signal: 2.83 VRMS stepped sine wave Smoothing: 1/6 oct.


	Measuring conditions, impedance Driver mounting: Free air, no baffle, back side open (no cabinet) Input signal: Stepped sine wave, semi- current-drive, nominal current 2 mA Smoothing: None


	NOMINAL SPECIFICATIONS

Notes	Parameter	Before burn-in	After burn-in	Unit
	Nominal size	8½		[inch.]
	Nominal impedance	4		[ohm]
	Recommended max. upper frequency limit	1,000		[Hz]
1, 3	Sensitivity, 2.83V/1m (calculated from T/S parameters)	87		[dB]
2	Power handling, short term, IEC 268-5, no additional filtering			[W]
2	Power handling, long term, IEC 268-5, no additional filtering			[W]
2	Power handling, continuous, IEC 268-5, no additional filtering	200		[W]
	Effective radiating area, Sd	214		[sq.cm]
3, 6	Resonance frequency (free air, no baffle), Fs	24		[Hz]
	Moving mass, incl. air (free air, no baffle), Mms	87.5		[g]
3	Force factor, Bxl	10.7		[N/A]
3, 6	Suspension compliance, Cms	0.50		[mm/N]
3, 6	Equivalent air volume, Vas	32		[lit.]
3, 6	Mechanical resistance, Rms	1.2		[Ns/m]
3, 6	Mechanical Q, Qms	11		[-]
3, 6	Electrical Q, Qes	0.37		[-]
3, 6	Total Q, Qts	0.36		[-]
4	Voice coil resistance, RDC	3.2		[ohm]
5	Voice coil inductance, Le (measured at 1 kHz)	0.5		[mH]
	Voice coil inside diameter	51		[mm]
	Voice coil winding height	29.4		[mm]
	Air gap height	8		[mm]
	Magnet weight			[g]
	Total unit net weight excl. packaging			[kg]
3, 5	Krm	1.33		[mohm]
3, 5	Erm	0.80		[-]
3, 5	Kxm	3.5		[mH]
3, 5	Exm	0.76		[-]

Note 1	Measured in infinite baffle.
Note 2	Tested in free air (no cabinet).
Note 3	Measured using a semi-constant current source, nominal level 2 mA.
Note 4	Measured at 20 deg. C
Note 5	It is generally a rough simplification to assume that loudspeaker transducer voice coils exhibit the characteristics of an inductor. Instead it is a far more accurate approach to use the more advanced model often referred to as the “Wright empirical model”, also used in LEAP-4 as the TSL model (www.linearx.com), involving parameters Krm, Erm, Kxm, and Exm. This more accurate transducer model is described in a technical paper (PDF) here.
Note 6	After burn-in specifications are measured 12 hours after exiting the transducer by a 20 Hz sine wave for 2 hours at level 10 VRMS. The unit is not burned in before shipping.


	OUTLINE DRAWING AND NOMINAL DIMENSIONS (mm)


	TERMINAL NOMINAL DIMENSIONS (mm)


	PACKAGING AND ORDERING INFORMATION

Part no. SW223BD01-01

Individual packaging (one piece per box)


	Latest update: Aug. 5, 2011

MORE INFO

PDF data sheet
(XXMB)

SW223BD01 pictures

Specs and measurements in electronic file formats

8½” passive BD radiator