SUPRA EFF-ISL - RCA SILVER PLATED AUDIO ANALOGUE INTERCONNECT CABLE
SUPRA EFF-ISL - RCA SILVER PLATED AUDIO ANALOGUE INTERCONNECT CABLE
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EFF-ISL Audio Interconnect – High-Fidelity Sound, Multi-Test Winning Performance
Introducing the Supra EFF-ISL audio interconnect, one of our most celebrated analogue cables, designed for audiophiles seeking flawless sound transmission and an immersive listening experience. The EFF-ISL is crafted with precision-engineered components and our advanced Equalized Frequency Flow (EFF) technology, delivering a signal transfer that captures every nuance and detail of your music. Unlike standard cables, the EFF-ISL effectively addresses critical factors like capacitance, phase alignment, skin effect, and shielding, ensuring unparalleled audio clarity.
The skin effect, a common issue in conventional cables, forces higher frequencies to travel along the conductor’s surface, leading to impedance mismatches and signal degradation. With EFF technology, each conductor is carefully constructed around a plastic core, creating a tube-like structure that forces all frequencies through the same cross-sectional area. This design maintains a consistent impedance across all frequencies, preserving original sound dynamics, clarity, and phase integrity.
Key Features & Benefits
- Equalized Frequency Flow (EFF) Design: Reduces skin effect by balancing impedance across all frequencies, ensuring precise audio reproduction.
- Silver-Plated Conductors: Optimized for high-frequency transmission, enhancing clarity and detail in ultra-high frequencies.
- PE Insulation for Low Capacitance: Reduces signal loss, delivering a clean, unaltered sound that captures every detail.
- Aluminized PET Foil Shielding: Provides exceptional RFI rejection, protecting against interference and maintaining signal integrity.
- Supra PPSL Connectors: Our top-of-the-line fully shielded RCA connectors with chuck-lock strain relief, ensuring a seamless and secure connection to your audio equipment.
EFF-ISL – Designed for Audiophiles, Made for Performance
Equipped with Supra PPSL connectors, the EFF-ISL offers stable, reliable connections and excellent shielding for long-lasting performance, even with frequent reconnections. Suitable for a wide range of single-ended applications, the EFF-ISL is ideal for audiophiles who demand precision, dynamics, and faithful music reproduction.
Supra EFF-ISL – Experience Sound Without Compromise. Crafted in Sweden to deliver the highest fidelity audio in every note, every time.



After been impressed with the Supra XL Annorum RCA analogue interconnect when used on a fairly serious CD Player I decided to upgrade the cables coming from my TV which seemed a bit dull sounding. I like watching the occasional DVD/Blu-Ray fed into the TV by a HDMI cable.
This is older gear needing 3m of cable which I felt warranted a less expensive but yet decent interconnect.
As it turns out my choice of the EFF cable was a great decision. A DVD of "Jarre Concert in China" 2004 mastered to very high audio quality yielded an amazing playback. This was live music played in "Forbidden City" in Beijing and broadcasted right through China at the same time.
The backwash of the sound reflections from the amazing architecture there came through showing lovely depth and width for that matter. All musical instruments and vocals came through perfectly and the Chinese Erhu violin was quite haunting.
I do indeed recommend this cable. Supra interconnect has come through a second time.
Better quality than previous cable from reputable band. Clean definition. Highs pronounced but not offensive. Realistic mid range. Bass tight.