DSP Amps
Subwoofer Box

APX 4 Coaxial | 120 W Peak Power | 100 mm | 4 ohm

APX 4 features a concentric coaxial tweeter: with one single point of sound emission it is possible to obtain a consistent in-phase response, with consequent reconstruction of the acoustic scene comparable to a system of separate woofer + tweeter.The 4³ cones surround features the exclusive shallow Triple Wave profile, for maximum excursion linearity.

Technical Specs

Woofer Size 100 mm
Tweeter Size 24 mm
Woofer Power Handling - Peak 120 W
Woofer Power Handling - Continuous 40 W
Woofer Impedance 4 Ohm
Woofer Frequency Response 80 ÷ 23k
Woofer Magnet Size 75 x 40 x 10
Woofer Voice Coil Diameter 32 mm
Tweeter Voice Coil Diameter 15 mm
Xmax 1.3 mm

Electric-acoustic Specs

D 85 mm
Re 3.1 Ohm
Fs 125 Hz
LE standard 0.04
Vas 1.5 l
Mms 5.3 g
Cms 0.3
Bl 3.2
Qts 1
Qes 1,2
Qms 8
Woofer Spl 91 dB


Weight 0.49 kg


Dimension A 102 mm
Dimension B 93 mm
Dimension C 43 mm
Dimension D 41 mm


Pair of 165mm speaker protective grilles, compatible with all woofers and 100mm coaxial, ideal for Audison AP 4.
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  1. Concentric Coaxial Tweeter: tweeter is mounted within the
    woofer with one single point of emission providing consistent
    phase response, with an accurate recreation of the sound stage
    comparable to that of a component system.
  2. Tweeter features an acoustic lens specifically designed to
    ensure an extremely linear frequency response, even in off-axis
    placement, typical of in-door installations.
  3. 32 mm pure copper voice coil, for high power handling and
    outstanding low frequency control.
  4. Overall mounting depth optimized for OEM Integration thanks
    to the concentric tweeter and the low profile basket.
  5. Water-repellent treated paper cone, featuring a profile developed
    with FEM (Finite Element Method) simulation technology and
    optimized with the Klippel Scan Vibrometer.
  6. TPU (thermoplastic polyurethane) suspension with unique “triple wave” profile for maximum linearity of excursion.
  7. Compact basket, protected by abrasion-resistant and scratchproof coating, the motor affixed with damping epoxy adhesive.
  8. High current fast-on terminal with double contact on positive
    and negative poles for high flexibility and quick connection. The
    terminal features a temperature resistant plastic cover,
    protecting it against accidental short circuits.
  9. Developed with the KLIPPEL suite. –

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