NEODYMIUM-IRON-BORON MAGNET Features an innovative sculpted, open cast aluminium basket design that minimizes internal acoustic reflections and supplements the neodymium motor’s dedicated heat sink. The cone is constructed of a coated natural wood fibre, with a butyl rubber surround designed by finite element analysis for linearity. Motor copper cap reduces inductance and extends high frequency performance. Cast aluminium frame promotes motor cooling

Sculpted design improves airflow and reduces reflections

High-strength compact neodymium magnet system

Proprietary coated natural wood fiber cone with half-roll rubber surround

Long-throw 1-1/4" voice coil on titanium former

Copper pole piece cap for extended HF response

8 ohm nominal impedance Product Specifications

Nominal Diameter4"

Power Handling (RMS)90 Watts

Power Handling (max)180 Watts

Impedance8 ohms

Frequency Response60 to 8,000 Hz

Sensitivity86.2 dB 1W/1m

Voice Coil Diameter1.28"



Thiele-Small Parameters

Resonant Frequency (Fs)61 Hz

DC Resistance (Re)6.3 ohms

Voice Coil Inductance (Le)0.06 mH

Mechanical Q (Qms)4.98

Electromagnetic Q (Qes)0.37

Total Q (Qts)0.35

Compliance Equivalent Volume (Vas)0.21 ft.³

Mechanical Compliance of Suspension (Cms)1.43 mm/N

BL Product (BL)5.53 Tm

Diaphragm Mass Inc. Airload (Mms)4.7g

Maximum Linear Excursion (Xmax)3.1 mm

Surface Area of Cone (Sd)54.1 cm²



Materials of Construction

Cone MaterialWood Fiber

Surround MaterialRubber

Voice Coil FormerTitanium

Basket / Frame MaterialCast Aluminium

Magnet MaterialNeodymium



Mounting Information

Overall Outside Diameter4.84"

Baffle Cutout Diameter3.86"

Depth2.58"

# Mounting Holes5



Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)

Sealed Volume0.05 ft.³

Sealed F3141 Hz

Vented Volume0.1 ft.³

Vented F384 Hz