Rogers LS4a


Frequency Response:  55 Hz - 20 kHz  ±2 dB
Impedance:  8 Ω Nominal
Sensitivity:  88 dB at 1m for 2,83 volts input
Power Handling:  150 watts (unclipped programme)
Recommended Amplifier Power:  15 - 100 watts per channel
Maximum Sound Pressure Level:  105 dBA (pair at 2 m)

Drive Units:

Tweeter :  19 mm Aluminium dome

Bass/Mid-range:  Rogers 205 mm Polypropylene coned of advanced acoustic design , with high flux magnet and Kapton voice coil former.

Crossover:  8 precision elements crossing over at 3 kHz at 18 dB per octave

Bass Loading:  Acoustic suspension to form a well damped Butterworth 2nd oreder maximally flat alignment with a -3 dB point at 55 Hz.

Distortion:  Less than 1% 2nd and 3rd harmonic 50 Hz -20 kHz at 90 dB S.P.L.

Connectors:  4 mm binding posts, spaced at 19 mm

Recommended Placement:  Stands - minimum 500 mm high with loudspeakers angled inwards so that their axes cross just in front of the listener.

Cabinet:  Critically damped partical board with medite baffle.

Finish:  High quality synthetic veneer, and black grille cloth

Dimensions (H x W x D):  430 x 255 x 245 mm (17" x 10" x 9,7")

Weight:  7,8 kg 917 lb)