The AP 4 midbass offers very extended frequency response, both in high and low frequencies, combined with high efficiency and features a 25 mm pure copper voice coil to ensure more balance in mid-high frequency ranges.

Features

• Very extended frequency response, in both high and low frequencies, combined with high efficiency.
• No passive crossover required to maximize efficiency: the cone is optimized with the Klippel Scan Vibrometer to obtain a calibrated mechanical low-pass cut-off frequency.
• Water-repellent treated paper cone, featuring a profile developed with FEM (Finite Element Method) simulation technology and optimized with the Klippel R&D Scan Vibrometer.
• Reduced mounting depth, providing ease of installation in OEM placements.
• TPU (Thermoplastic Polyurethane) surround, featuring the exclusive shallow “Triple Wave” profile, for maximum excursion linearity.
• 25 mm pure copper voice coil; ensuring precise balance in the mid-high frequency range.
• Compact basket, protected by abrasion-resistant and scratch-proof coating.
• Developed with the KLIPPEL suite.

Technical Specs

Nominal diameter	100 mm (4 in)
Impedance	4 Ohm
Power Handling - Peak	120 W
Power Handling - Continuous	40 W
Sensitivity	91 dB
Frequency Response	80 ÷ 7,5k Hz
Voice Coil Ø	25 mm
Magnet size D x d x h	70 x 32 x 10 mm (in.)
Xmax	1.8 mm (0.07 in)

Electric-acoustic Specs

Re	3.2 Ohm
Fs	125 Hz
Le	0.16 mH
Vas	1.5 l (0.053 ft)
Mms	5 g (0.176 oz)
Cms	0.3 mm/N
BL	3.4 T•m
Qts	1
Qes	1,2
Qms	7.6

General

Weight

0.4 kg

Dimensions

Dimension A	103 mm (4.06 in)
Dimension A3	130 mm
Dimension B	93 mm (3.66 in)
Dimension C	43 mm (1.69 in)
Dimension D	41 mm (1.61 in)