iSOUND DUO MK2 Twisted Pairs 6N OFHC Speaker Cable
MSRP:   $250 / 8 Foot      $320 / 10 Foot      $390 / 12 Foot

BiWire: $320 / 8 Foot    $390 / 10 Foot     $460 / 12 Foot

DUO, TRIO & QUARTET minimize inductance by grouping the conductors as multiple twisted-pairs. The pairs are connected so that the current in first conductor of each pair runs in the opposite direction from the current in the second conductor. The magnetic field coupling between the twisted-pairs reduces the inductance, making it lower than the self-inductance of the wires themselves. Twisted pair cabling is a type of wiring in which two conductors (the forward and return conductors of a single circuit) are twisted together for the purposes of canceling out electromagnetic interference (EMI) from external sources; for instance, electromagnetic radiation from Unshielded Twisted Pair (UTP) cables, and crosstalk between neighboring pairs. Twisting the wires in a cable improves the cable's ability to reject external noise. It also reduces the cable inductance and may be the most effective way to keep the individual wires from vibrating with respect to each other.

Length:  8.0 Foot / 10 Foot / 12 Foot 
Construction: 4 x LCHC
Conductors: 4N OHFC
Insulation: PET
Dielectric constant: 1.35 (avg over cable length)
Capacitance: 16 pF/ft
Inductance: 0.95 uH/ft
Nominal current: 10A 
LCHC factor: 75%

Speaker cables transfer high-bandwidth power in a low-impedance environment. The power amplifier output impedance is usually on the order of a few tenths of an ohm and the speaker load typically varies from 3-30 ohms depending on the signal frequency, particular speaker and crossover. Transient currents of 30 amps or more can occur during dynamic, high-level music passages when driving low-efficiency speakers. Because power transfer is the primary purpose of a speaker cable, resistance and inductance are more important than capacitance. The low output impedance of the power amplifier is generally capable of driving relatively high capacitance, whereas significant voltage drops can develop across the speaker cable and connectors due to resistance and inductance, particularly when high-current transients occur. Extremely high capacitance has been known to cause instability in some amplifiers, but this is not typical.

Minimize DC Resistance

Two factors determine the DC resistance of the wire: the gauge of the wire and its length. Any speaker wire will have at least some DC resistance. The longer the wire, the more resistance it will have. But a larger gauge wire will have less resistance at the same length as a smaller gauge. The more DC resistance a speaker wire has, the lower the signal power will be when it reaches the speaker.

A speaker's impedance rating is merely a nominal figure. In actuality, the speaker's impedance is frequency-dependant, and can drop as low as a couple of ohms, or even less, and get very high - say 50 ohms or more - at various frequencies. Some speakers are a more "reactive" load, with wildly-varying impedances; others are fairly stable and flat throughout the frequency spectrum. Most speakers are somewhere between those two extremes.

INCRECABLE iSOUND speaker cables minimize resistance by using a sufficient number of parallel runs of wire to equal the equivalent of 11 gauge. We have determined empirically that iSOUND speaker cables is required to work effectively with a broad range of amplifiers and speakers. We offer a cost-reduced version of iSOUND series for more efficient or low-budget systems, it will variably be installed in low efficiency systems, resulting in powerful and an audible dynamics.

Minimize Inductance & Capacitance

When current passes through a wire, it builds out an electromagnetic field. That field, when it crosses into another wire, induces the signal into the other wire. Since each wire of a speaker cable run induces signal into the other, the effects can either improve or deteriorate the signal quality, depending on other circumstances.

Capacitance is the capacity of two conductors to store electricity. An actual capacitor has two metal plates placed close to each other, with the two sides of an electronic signal applied to each. Since two speaker wires represent such an arrangement, the capacitance of the cables affects the overall impedance of the cable

INCRECABLE iSOUND speaker cables such as DUO, TRIO & QUARTET minimize inductance by grouping the conductors as multiple twisted-pairs. The pairs are connected so that the current in first conductor of each pair runs in the opposite direction from the current in the second conductor. The magnetic field coupling between the twisted-pairs reduces the inductance, making it lower than the self-inductance of the wires themselves. Twisted pair cabling is a type of wiring in which two conductors (the forward and return conductors of a single circuit) are twisted together for the purposes of canceling out electromagnetic interference (EMI) from external sources; for instance, electromagnetic radiation from Unshielded Twisted Pair (UTP) cables, and crosstalk between neighboring pairs. Twisting the wires in a cable improves the cable's ability to reject external noise. It also reduces the cable inductance and may be the most effective way to keep the individual wires from vibrating with respect to each other.

Minimize Skin-effect

Skin-effect occurs when the high-frequency currents flow on the outer "skin" of the conductors whereas lower frequencies have more uniform current distribution across the conductor cross-section. This happens when too large a gauge is chosen for the conductors. The effect is that the impedance (primarily inductance and capacitance) is different for low frequencies than high frequencies. This difference in impedance can cause phase shifts in high-frequency passages relative to low-frequency passages, causing a smearing effect to the music. If a sufficiently small gauge is chosen for the conductors, all frequencies are "forced" to flow more uniformly in the conductors. INCRECABLE minimizes skin effect by careful choice of conductor size to optimize for low as well as high frequencies. This insures that the current distribution is relatively uniform at all audio frequencies.

Minimize multiple-conductor interaction

Multiple conductors are required to minimize inductance and minimize skin effect, but if the geometry is not carefully designed, crosstalk between these can negate many of the positive effects. INCRECABLE designs virtually eliminate interactions between twisted pairs.

Minimize Dielectric Absorption and Dissipation Factor

Placing each twisted-pair in a separate tube forces air dielectric around the pairs, which helps to lower the effective dielectric constant. A lower dielectric constant is desirable because it results in lower dielectric absorption and lower dissipation factor.