The No.4.2 loudspeaker is a 2 way system with an integrated active bass unit. Two side-positioned 10 inch long-stroke chassis are at work in each loudspeaker, which are activated by an integrated power amplifier.


This allows them to draw on their own customized power source, accessible without long signal paths, which thus keeps the chassis on a “short leash.”


As a result of the back-to-back configuration, the enclosure experiences only minimal vibrations and distortion is significantly reduced as compared to a single driver, which is subject to more motion. A pleasant side effect of the driver configuration is the slender form of the enclosure with its acoustically optimal baffle.


The 20-cm midrange driver consists of an Omniex membrane that weighs only 8 grams. It is mounted with a hard suspension that produces almost no throw at all.


The lightweight, highly responsive midrange driver is a proprietary development, enabling seamless soft coupling via an ultra low-loss frequency crossover with exceptional impulse fidelity. Considering its superb resonance and distortion characteristics, this driver represents a perfect match for the CORONA plasma tweeter.


As a wideband system, it also provides a perfectly phase-optimized crossover network using just two components of the highest quality. The partially active concept and the high degree of speaker efficiency also permit the use of smaller amplifiers, for example, based on tube technology.     



semi-active speaker
Design 2-way closed speaker with integrated active subwoofer
Tweeter 1 x 0,3 in. CORONA plasma tweeter
Midwoofer 1 x 8 in. paper-coated cone
 active Woofer 2 x 10 in. long neck construction

Crossover Frequencies 

2.5 kHz

Impedance (nominal) 

8 Ω (minimum 6.2 Ω)
Sensivity 96 dB / 1 W / 1 m

Frequency range

15 Hz - 150 kHz ±3 dB
Dimension 44.0 x 11.4 x 20.0 in.. (HxWxD)
 Weight 154 lbs. (70 kg)
Amplifier 1 x 1.200 Watt (power output)



High Polish black

High Polish macassar

High Polish white


-  Germany  -

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