Ekvatorijalni IEM kabel

The kabel that ships with most IEMs is an afterthought — a commodity product sourced from the same suppliers who make charging kabeli for mobile phones. It tipično uses bakar-clad aluminij provodnici (CCA) with PVC izolacija, terminated with whatever konektori meet the minimalni mehanički specifikacija at the lowest cijena. The electrical svojstva of such a kabel nisu controlled, not specified, and not relevant to the proizvođač's kvalitet assurance proces. Ovo je economically rational and akustički indefensible.

The Ekvatorijalni IEM Kabel uses four cores of posrebren bezkosikonički bakar in a Litz braided geometrija. Srebro plating increases the površina conductivity of the bakar by 6%, which matters because the skin efekt at audio frequencies iznad 10kHz concentrates struja flow in the outermost layer of the provodnik — the layer where the srebro resides. The Litz braid osigurava that each core occupies every position in the kabel's cross-section equally over its length, preventing any single core from being consistently closer to or farther from vanjski interferencija sources. The foamed polyethylene izolacija has a dielektrik constant of 1.5 — u poređenju sa 3.4 for PVC — which smanjuje the kabel's distributed capacitance to ispod 28 picofarads po metru. High kabel capacitance forms a low-pass filter with the slušalica's impedansa, rolling off the treble at a frekvencija that depends on kabel length and driver impedansa. With a 1.3-meter kabel and a 14-ohm IEM, a PVC-insulated kabel's capacitance of 80 pF/m proizvodi a -3dB point at približno 140kHz — well iznad audibility. The same kabel at 28 pF/m pushes that point to približno 400kHz. Whether this matters is a question we have chosen not to answer.

The ekvatorijalni splice at each termination point is the same tehnika used throughout our kabel product line. Each solder joint is made with the kabel oriented duž the east-west axis u našem ekvatorijalnom pogonu, ensuring that the solder's crystallographic solidification occurs in a magnetically symmetrical okruženje. The resulting joint nema preferred direction of struja flow — a svojstvo that we mjeriti with a four-wire otpor test in both directions and certify on the kvalitet control document included with each kabel.

The kabel terminates in a 4.4mm Pentaconn balanced konektor at the izvor end, with screw-on adapters for 3.5mm single-ended and 2.5mm balanced connections included in the package. At the IEM end, the kabel is available with either MMCX or 2-pin 0.78mm konektori — specify at the time of order. The two standards are mehanički incompatible and električno identičan, which is a useful summary of the IEM industrija's approach to standardization.