Rogers LS4a

 Over the years, our products have earned a worldwide reputation for fine sound quality and high standards of construction. The primary design aims have always been tonal neutrality, low colouration, transparency and wide bandwidth. Another major consideration is consistent and trouble free performance from a system over many years of operation. To ensure this, only high quality components are used in the construction of our loudspeakers.

 From time to time we introduce a new model, when we do, the new design must possess the strengths of its predecessor, plus other substantial advances, in order to justify the change. Our new designs tend therefore to be few and far between.

 Constant background research does, however, yeild improvements in our understanding of loudspeaker systems and advances in the performance of drive units. The use of Polypropylene as a cone material, and the recent introduction of high performance metal dome tweeters has meant that advances are possible.

 The friuts of this research and increased understanding of system behaviour has yielded new systems of advanced design and high quality performance.

Specifications

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)