Having gained experience while building the Light System, we have created a new coaxial transducer for even a bigger speaker chamber to enhance the efficiency of bass. By combining the crossover chamber with the speaker one, we have managed to add an extra few litters to the speaker chamber. All is done with almost no change to the outer dimensions of the cabinet; Lighting are still to be consider as monitors. Their crossover is based on Jantzen Alumen Z-cap capacitors – the highest product of the company brand. The sets have also been equipped with first-rate binding posts of Viablue Audio Company. (Jantzen Superior Z-cap capacitors and high-end quality binding posts of Hungarian KaCsa Audio Company BP-6323G are mounted in the Light System.)
Features.
At the heart of the Lighting System (similar to the Light System) is its mid-bass speaker. Its voice coil weight is extremely low. This ultralight voice coil is obtained by applying pure aluminum as a winding wire. In its sheer form, aluminum is seldom used by speaker manufacturers for is extremely difficult method of soldering.
The coil is run with the help of two neodymium magnets mounted round a pole designed to centre the two speakers coaxially. The tweeter with a one-inch silk dome is featured by a specifically shaped waveguide that integrates the sound waves of the both speakers.
The rubber surround of the mid-bass speaker is designed to lessen the diffraction of short waves, which are extremely susceptible to any abrupt irregularities in their propagation. However, the shape of the surround is just half the battle. Its material is characterized by a high ratio of reversible deformation under the influence of mechanical and temperature factors. Moreover, its effect on the compliance of diaphragm suspension is almost negligible. Creating rubber based on granules of EPDM (ethylene propylene diene monomer) with additives increasing its durability and lightness is a great challenge.
At the core of the speaker motor is a naturally sounded 6.5 inch cone made of carbon fibre with glass fibre additives in an adequate proportion. The cone is flat enough to put forward tweeter waves without any broadband dissipations, and still its funnel-like shape is stiff enough to transmit bass.
The cabinet is a sandwich constriction of chipboard and MDF board as to eliminate its resonances.The crossover is mounted in the bottom of the speaker chamber and its larger part is covered with a dumping material. The outer part of the cabinet is covered with a special material to reduce baffle diffractions. A high-gloss veneer is made to impress.
Characteristics charts.
Due to a considerable change of phase angle together with a decrease of the impedance (Fig.1), an optimal performance is achieved when powered with solid state or hybrid power amplifiers which are featured by a high damping factor.
The impedance dropping alongside with the considerable phase angles yielded a large power intake and so amplified higher frequencies in the very area. In other words, the efficiency of the power amplifiers to answer the need for the power intake above 1 kHz was very high. With regard to that, the SPL above 1 kHz is slightly lowered to even the overall tonal balance of the setup. On the other hand, a subtle uplift of the frequency response above 10 kHz makes up for a natural dissipation of very short waves in the domain in an average listening room. If they are heard, they create a sense of clarity as for instrument dimensions and sound staging. A scarce attenuation in the zone of 70 Hz is created to equalize the bass frequencies as to compensate for a frequent mode in this area in an average listening room.
Fig. 3 displays an SPL characteristic in a listening room, and as such it is a practical representation of the sound perceived by a listener in a particular room.
The room dimensions: [m] 5,45 x 3,8 x 2,62 (width x depth x height). Measuring conditions: the loudspeaker sets were directed towards the listener/microphone in the angle of 30 degrees and placed at a long wall asymmetrically, 0.9 m from the window on the left side (the window was 2/3 size of the wall) and 1.8 m from the right wall. The speakers were away of 0.5 m from the front wall and the distance between them was 2.75 m, alike was the distance between them and the listener/microphone. The wall behind the listener/microphone was 0.8 m.
Despite a clear decline of the SPL characteristic along the higher frequencies, the overall energy of the sound was, most of the time, focused in the low midrange area. And yet, it has to be noted that the sound impression stayed closely related to an amplifier sound character. Most of the time, it was a performance with a selective and high definition reverbs perceived as cultured and seldom coarse unless given so by the recording itself.
