Description
APBMW S8-4 Technical Data
| Component | Woofer | |
| Size | mm (in.) | 200 (8) |
| Power Handling | W peakW continuos | 300150 |
| Impedance | Ω | 4 |
| Frequency Response | Hz | 35 ÷ 500 |
| Magnet size D x d x h | mm(in.) | 48 (1.89) x 18 (0.71) x 7 (0.28) |
| Weight of one speaker | kg (lb.) | 1,21 (2.67) |
| Voice Coil Ø | mm (in.) | 50 (2) |
APBMW S8-4 Features
Developed with electroacoustic parameters customized for BMW-Mini
– To increase listening engagement, through powerful and crisp low frequencies, exploiting the acoustic load provided by the factory box.
Neodymium Magnetic group
– With an inverted acoustic structure featuring an internal cone, to maximize performance while minimizing bulk and weight.
38 mm voice coil wound on an aluminium support
– For a considerable power dissipation and stability even during high excursions.
Two 5 mm gaskets provided
– For OEM placements.
2-ohm configuration for maximum output
– In combination with AP 8.9 bit in active multi-amplification.
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This super-wide, industry leading frequency range offers listeners unparallel sound quality and detail that bests even the most high-end audiophile equipment. 5Hz-100kHz for 4ch, 5Hz-400Hz for Mono (+0,-3dB)
The all-new PDX series amplifiers are not your typical class-D amplifiers. Traditionally, class-D amplifiers have not been known for high frequency reproduction. These new PDX amplifiers are the first ever class-D amplifiers to break tradition and trump the amps of yesterday. The 
The PDX power supply delivers tremendous headroom with low distortion and noise. PDX amplifiers have an extremely high total system efficiency of ~80% (power supply is rated at >90%, output stage is rated >90%).
PDX amps incorporate Alpine’s new Power Management circuit. The Power Management Processor controls all aspects of amplifier performance, monitoring voltage, temperature and output to ensure uninterrupted power output for non-stop listening. If the amp gets too hot, the Thermal Protection circuit kicks in and gradually decreases output power until it cools down. Once cool, the power output automatically increases back to the previous level. If the circuit detects a Low Battery condition, it will gradually decrease power output if battery voltage becomes too low. Once the battery voltage increases, power will be restored. This interruption-free design allows for non-stop enjoyment with no hiccups or drop-outs, just clean, clear output.
Each PDX amplifier comes with its very own birth-sheet. PDX amplifiers are tested and documented to show their true actual output.
The new PDX series amplifiers are 20% thinner than previous models at only 2″ thick. New stacking system packs the amps closer together so there are no gaps and to save space in the trunk while directly coupling the amps heatsinks to help share cooling duties.
The super high power speaker connectors allow for up to 10 mm² wiring and have a unique quick disconnect design for simple error-free installation.
The new removable connector features a low-loss, high-current design. It accepts up to 25 mm² wire, to ensure your amp gets the power it needs while allowing for easy installation.
Simply add the 
PDX amplifiers come with easy-to-remove trim rings, so if you would like to customize them, you can have them painted. Add it as another Do-It-Yourself project, or leave it to professionals and ask an Authorized Alpine installer near you. The removable trim ring can be custom painted to match your vehicle or personalized to anything you want.