JPH04269404A - Speaker cable for audio apparatus - Google Patents

Abstract

PURPOSE:To feel no sense of incompatibility near crossover frequency of a high register and a low register of a speaker cable moreover to be able to broaden the register up to its high range. CONSTITUTION:A speaker cable 10 is formed by twisting a pair 14 for a high- pitched tone and a pair 12 for a low-pitched tone while being set up at about the same attenuation factor so that an attenuation factor of the pair 14 for a high-pitched tone may include a difference within + or -10% in comparison with an attenuation factor of the pair 12 for a low-pitched tone at a crossover frequency which stays in a boundary of the frequency bands between a high register and a low register, and further more, being set up so that the attenuation factor of the pair 14 for a high-pitched tone may be smaller than the attenuation factor of the pair 12 for a low-pitched tone at any frequency in a range from 10kHz to 50kHz.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to improvements in speaker cables used between amplifiers and speakers of audio equipment, and more particularly to improvements in speaker cables used to drive speakers using a bi-wiring method. It is.

0002

2. Description of the Related Art Recently, a bi-wiring method has been adopted for speaker cables used between an amplifier and a speaker, in which a high-pitched pair and a low-pitched pair are wired separately. The speaker box has a bass terminal and a treble terminal, and the treble pair and the bass pair are connected to these terminals, respectively.

0003

[Problem to be Solved by the Invention] In this type of speaker cable, if the treble pair and the bass pair are made of the same material and have the same attenuation, the treble and bass pairs are separated. Compared to a pair of speaker cables that are not connected, the effect of widening the sound band cannot be expected. Generally, speaker cables with a conductor area of 0.75 mm2 to 8 mm2 are used, but the larger the conductor area, the better the sound quality in the low range, while the structure of the high-pitched speaker makes it difficult for current to flow in the high range. It is believed that the conductor may have a small diameter. For this reason, it is conceivable to use a small-diameter conductor for the treble pair and a large-diameter conductor for the bass pair. However, with this configuration, as shown in FIG.
Since there is a large difference D in the amount of attenuation between the bass pair and the treble pair, the sound is distorted near this crossover frequency C, resulting in an unnatural sound.

If the attenuation characteristics of the treble pair and the bass pair are known, by adjusting the lengths of these pairs,
Although it is possible to prevent the step D from occurring near the crossover frequency of , it is often difficult to adjust the length of the pair due to restrictions on wiring routes and speaker placement in general household wiring.

[0005] Actually, there are no speaker cables on the market that come with data such as attenuation characteristics, and general audio enthusiasts who do not have knowledge of cable design, evaluation techniques, etc. may feel something strange near the crossover frequency. It was difficult to select a cable that could widen the band without causing problems.

SUMMARY OF THE INVENTION An object of the present invention is to provide a speaker cable for audio equipment that avoids the above-mentioned drawbacks, does not cause discomfort near the crossover frequency, and can widen the band to high frequencies.

[0007]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a speaker cable for audio equipment having a treble pair and a bass pair each consisting of one or more pairs of twisted wires. At the crossover frequency, which is the boundary of the frequency band covered by the bass pair, the attenuation of the treble pair is set to be within a ±10% difference from the attenuation of the bass pair, and between 10 KHz and 50 KHz. An object of the present invention is to provide a speaker cable for audio equipment, characterized in that the attenuation amount of the treble pair is set to be smaller than the attenuation amount of the bass pair at a frequency of .

[0008]

[Operation] In this way, at the crossover frequency, which is the boundary between the frequency bands handled by the treble pair and the bass pair, the attenuation amount of the treble pair is within a ±10% difference from the attenuation amount of the bass pair. If you set it so that there is no discomfort in this range, you can obtain a smooth connection of sounds,
Furthermore, if the attenuation amount of the treble pair is set to be smaller than the attenuation amount of the bass pair at a frequency of 10 KHz to 50 KHz, sound quality with a wider treble range can be obtained.

[0009]

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a speaker cable 10 for audio equipment according to the present invention, each of which has one or more pairs of twisted wires. It has a bass pair 12 and a treble pair 14 consisting of a bass pair 12 and a treble pair 14.
The attenuation of the treble pair is within a ±10% difference from the attenuation of the bass pair at the crossover frequency C (up to 4 KHz), which is the boundary of the frequency band handled by these pairs 12 and 14. The attenuation amount of the treble pair is set to be no less than that of the bass pair at frequencies from 10 KHz to 50 KHz. Therefore, the crossover frequency of the bass pair 12 and the treble pair 14 does not create a sense of discomfort due to a step difference, and a smooth connection of sounds can be obtained, and the sound has a wide range in the treble range of frequencies from 10 KHz to 50 KHz. You can get good sound quality.

In one embodiment, the bass pair 12 is formed by twisting two wires 16 in pairs, each wire 16 being made of 80 single crystal high purity copper wires each having a diameter of 0.18 mm. Stranded wire 16A
A polypropylene coating 16B having a thickness of about 0.3 mm is formed by extruding and coating polypropylene on the stranded wire 16A, and the treble pair 14 is also made by twisting two wires 18 in pairs. As shown in FIG. 2, each strand 18 is connected to a central intervening string 20 made of polyethylene with a diameter of 0.5 mm.
The 6 stranded wires 22 formed by twisting together 12 wires of 18 mm, the stranded wire 18A formed by rope twisting, and the stranded wire 18A formed by extruding and coating polypropylene on the 6 stranded wires 22 have a thickness of approximately 0.45 mm of coating 18B. After twisting the bass pair 12 and the treble pair 14, a paper tape presser 24 and a PVC sheath 26 were applied thereon to form a speaker cable 10 having an outer diameter of about 12 mm.

FIG. 3 shows the frequency characteristics of the attenuation of the speaker cable according to the above embodiment, where the line W shows the attenuation of the bass pair, and the line T shows the attenuation of the treble pair. This figure 3
As can be seen from the above, up to the crossover frequency (4 KHz), the bass pair 12 has almost the same attenuation as the treble pair 14, and between 10 KHz and 50 KHz, the bass pair 1
2 has a larger attenuation amount than the treble pair 14.

In another embodiment, each strand 1 of the bass pair 12
6 was formed by extruding and coating polyvinyl chloride on 16A of oxygen-free annealed copper strands with a cross section of 3.5 mm2 (45 conductors with an outer diameter of 0.32 mm twisted together). It consisted of a polyvinyl chloride coating 16B having a thickness of about 0.5 mm. Each wire 18 of the treble pair 14 is formed by twisting single-crystal oxygen-free copper hard copper wires with a cross section of 1.25 mm2 (50 conductors with an outer diameter of 0.18 mm twisted together). It consisted of a stranded wire 18A and a coating 18B formed thereon by extrusion coating polyethylene to a thickness of about 0.5 mm.

1K of speaker cable according to this embodiment
The attenuation amount at Hz is 12 for bass and 14 for treble.
Since both are almost the same at 0.38dB/km, there is no discomfort in the sound at this frequency, and 20KH
The attenuation amount of the treble pair at z is 0.8 dB/km, while the attenuation amount of the bass pair is 1.1 dB/km, making it possible to obtain sound quality over a wide band.

[0014]

According to the present invention, as described above, at the crossover frequency which is the boundary of the frequency band handled by the treble pair and the bass pair, the attenuation amount of the treble pair is greater than the attenuation amount of the bass pair. Since the attenuation amount is set to be almost the same so that the difference is within ±10%, there is no discomfort in this range, and a smooth connection of sounds can be obtained.
Since the attenuation amount of the treble pair is set to be smaller than the attenuation amount of the bass pair at frequencies from KHz to 50 KHz, there is the practical benefit of being able to obtain sound quality with a wide band extending to the treble range.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a speaker cable for audio equipment according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a treble pair used in the speaker cable of FIG. 1;

FIG. 3 is a diagram showing frequency characteristics of attenuation of a speaker cable according to an embodiment of the present invention.

FIG. 4 is a diagram showing frequency characteristics of attenuation of a conventional speaker cable.

[Explanation of symbols]

10 Speaker cable 12 Bass pair 14 Treble pair 16, 18 Element wire 26 Coating

Claims (1)

[Claims] 1. A speaker cable for audio equipment having a treble pair and a bass pair each consisting of one or more pairs of twisted wires, wherein the treble pair and the bass pair each have a crossover frequency that is the boundary of the frequency band handled by the treble pair and the bass pair. Set so that the attenuation amount of the treble pair is within ±10% difference from the attenuation amount of the bass pair, and
A speaker cable for audio equipment, characterized in that the attenuation amount of the treble pair is set to be smaller than the attenuation amount of the bass pair at a frequency of .