The patent relates to metallic conductor proposed for the construction of wire, used for transmission of high bandwidth, low frequency electric signals - for instance, those related to audio frequencies - for transmission of electric voltage or power in sound reproduction components. Ih such applications, the signal transmission between the source (microphone, CD player, turntable, etc.) and preamplifiers, then to power amplifiers and finally to the loudspeakers, is performed by the use of cables, in which the conductive material is metallic. The frequency of such signals extends from several Hz to at least 20 kHz, but for higher quality, the 100 kHz limit is mandatory. The metallic conductors used in the manufacture of cables are made of copper, silver or even copper or silver alloys, thus, metals of high specific electric conductivity. For signals like the ones mentioned above, with bandwidth of 10 octaves or even more, these conventional metallic conductors are characterized by serious disadvantages. All metals under ordinary temperature conditions, are characterized by electric resistance and limited conductivity. When electric signal flows through these conductors, part of the energy produced by the source is consumed by the resistance of the conductor and transformed to heat. This loss is calculated as P=I2R. Additionally, the voltage at the load is decreased by the factor of V=IR. Thus, phenomenally only the use of metals of high specific electric conductivity like copper and silver is proposed. These phenomena have effect on both AC and DC signals, and are faced by the use of conductors of high purity and large cross section area. Actually, in AC signals, besides electrical resistance, another two phenomena appear: the skin effect and the relation between the velocity of signal propagation and the cyclical frequency ω. The electric signal inside the conductors is transferred in form of electric field E^Eoe ^sinfωt-βz). The term az relates the attenuation of the signal amplitude in depth z measured from the surface of the conductor and βz the phase shift φ. a and β are constants, which depend on the material of the conductor. For low frequencies, like audio frequencies, a=β=y(μωσ/2), μ is magnetic permeability and for all non magnetic metals can be considered as constant, equal to 4πlO"7 Henry/meter, σ is the specific electric conductivity of metallic element of which the conductor is made. For audio frequencies (20Hz - 2OkHz) the term e ™ is negligible. This is one part of the skin effect. The other one is phase shift of each frequency transferred through the conductor and is analogous to the distance z from the conductor's surface φ=βz=(^l(μωσ/2))z. The signal at the load is a synthesis of the signal at the source, along with infinite signals of the same frequency but delayed phase. Phase shift depends on the distance from the surface of the conductor and is directly analogous to it. Due to this phenomenon the signal undergoes serious distortion. The term βz in depth z=δ where δ=l/a=^(2/μωσ) is equal to lrad or 57,3°, a phase distortion of signal E that is far greater than to be omitted. Skin effect is faced, to a less degree, by the use of conductors of specific geometry like ribbon conductors. The second phenomenon is the relation between the signal's velocity of propagation and the cyclical velocity ω that is expressed as u=^(2ω/μσ). A single pulse composed of a group of frequencies ranging in a bandwidth Aω, has specific amplitude and duration, which is the result of confluence of the frequencies' amplitude at zero time. When the pulse is transmitted through the conductor its shape will be distorted because each frequency propagates with different velocity and the synthesis of the waves will not remain constant any more. This phenomenon is common in both conductive and non-conductive materials. On the contrary, in free space, the electromagnetic waves are all propagated at the same velocity of c=(μ(βo)~m, where c is the speed of light in vacuum. When a synthesis of signals with cyclical velocity ωj and its harmonic <of=4a>i is propagated through a conductor, it is obvious that wave 0)2 is propagated with greater velocity U2=2ui than wave ωι does. In audio frequencies, where the bandwidth is greater than 10 octaves, this phenomenon is extremely important We can notice that the velocity of propagation does not relate to the geometry of the conductor, which means that there is no way of lessening the distortion, when using wires made of conventional, highly conductive metallic materials. Conductors made of highly conductive metals, like cooper and silver, deteriorate this problem. [C. Kittel "Introduction to Solid State Physics", fifth edition, Wiley & Sons, greek translation, chap. 6 (pg. 168-176), chap. 10 (pg. 287-290), HJ. Pain "The Physics of Vibrations and Waves", Wiley & Sons, greek translation, chap. 7.7 (pg. 225-228), chap 7.8 (pg. 228-229), chap. 7.9 (pg. 229-230), Malcolm Omar Hawksford 'The Essex Echo" Stereophile magazine, Oct 1995]. The target of this invention is to lower the previously mentioned two types of distortion. The first relates to the phase shift and the second relates to the velocity of propagation of field E transmitted through the conductor. This is achieved by the application of conductors made of highly pure aluminum, tungsten, zinc, chromium, tantalum, columbium, vanadium and titanium. Those elements are characterized of lower specific electric conductivity than copper and silver. In equations describing those phenomena, specific electric conductivity σ is raised in power (-1/2), thus the use of metallic conductors with specific electric conductivity e.g. equal to the % of copper, results in increase of the skin depth by 100%. This way, the phase shift is reduced by 50%. Additionally, when two signals of different frequencies are emitted at the same time at the source, they never arrive together at the load. For specific conductor's length L, time delay at the load is At=L(l/uj-]fu$, where uj said U2 are the velocities at which the two signals propagate inside the conductor. Substituting w/ and U2, we have Δt=lA((μσf2)(lf<ύi-lfω2)). That means the use of metallic conductors with specific electric conductivity equal to the 1A of copper, results in increase of the velocity of propagation by 100%, thus decreases time delay At by 50%. Table (1) gives the calculations of phase shift and time delay reduction, relatively to copper, for each metallic element mentioned in this invention. The side effect of the increase of resistance of the wire that results from the implementation of conductors made of one of the eight metallic elements mentioned in this invention can be counterbalanced by analogous increase in the cross section area of the wire. When low resistance of the wire is not critical, conductors made of metals of low specific electric conductivity, like columbium, vanadium and titanium, can be used. If low resistance is a critical factor, conductors made of any of the eight metallic elements mentioned in this invention, can be used, balancing low resistive loss and low phase shift and time delay distortion. High purity of the conductor's material is a critical factor for the accurate transmission of wide bandwidth electric signals. Mixture of one or more elements with any of the metallic elements mentioned in this invention, results in appearance of various types of anomalies a) at the crystal structure of the basic element and b) at the flow of the tree electrons inside the conductor, having as a 5 result increased noise. [C. Kittel ""Introduction to Solid State Physics", fifth edition, Wiley & Sons, greek translation, chap. 17]. For this reason, conductors made of alloys of the metallic elements specified in this invention, are not suitable at all for accurate transmission of electric signals.

(*) These terms are accounted for the use of the listed metallic elements relatively to copper, when used for the manufacture of the conductor.