Oehlbach Bi-Tech 4 L (2 x 4m)
Overview
The Bi-Tech 4 L adopts a revolutionary technical approach: separating the transmission of different frequency bands using specialized conductors. Designed for high-end hi-fi systems and demanding home theater installations, it transforms simple signal transport into a science of precision.
Technical Architecture with Differentiated Conductors
The major innovation of the Bi-Tech 4 L lies in its unique asymmetric design. Unlike traditional cables that use identical conductors, this model features two distinct networks: 2 x 2.5 mm² SPC copper (silver-plated) conductors dedicated to mid and high frequencies, and 2 x 4 mm² pure OFC copper conductors for low frequencies.
This separation leverages a little-known physical phenomenon: the skin effect. High frequencies travel mainly on the surface of the conductors, hence the use of silver plating, which optimizes this surface transmission. Low frequencies, on the other hand, use the entire cross-section of the conductor, justifying the use of thicker, high-conductivity pure copper conductors.
The result? A natural separation of signals that preserves temporal coherence and limits interactions between frequency bands, which are sources of distortion in conventional cables.
Premium Materials and German Craftsmanship
The quality of the materials clearly sets the Bi-Tech 4 L apart from the competition. The OFC (Oxygen-Free Copper) undergoes a purification process that eliminates impurities responsible for micro-distortions. Its homogeneous crystalline structure limits interactions between metal grains, ensuring linear signal transmission.
The silver plating of the high-frequency conductors is not just marketing—it’s a technical necessity. Silver, being a better conductor than copper, optimizes the transmission of high frequencies while retaining the economic advantages of copper as a base material.
The connectors are plated with 24-carat gold, ensuring a stable connection over time. Gold does not oxidize, maintaining minimal contact resistance even after years of use.
The transparent polymer sheath combines flexibility and electromagnetic protection. Its transparency allows visual inspection of the conductors’ integrity, while its flexibility makes routing easier in complex installations.
Installation and System Compatibility
The Bi-Tech 4 L is intended exclusively for speakers equipped with dual binding posts, allowing for the physical separation of low and high frequency paths. This configuration, common on quality hi-fi speakers, requires the removal of the metal jumpers that usually link the terminals.
Installation requires four connections per speaker: two for the lows, two for the highs. The gold-plated connectors screw directly onto the speaker terminals, ensuring optimal contact with no risk of loosening.
Compatibility extends to amplifiers up to 400 watts per channel. This high limit covers the majority of home setups, from nearfield listening systems to high-powered home theaters.
The standard length of 3 meters suits most living room configurations. Other lengths are available for specific installations.
Recommended Applications and Use Cases
The Bi-Tech 4 L excels in reference hi-fi systems where every detail matters. High-end floorstanding speakers, often equipped with dual binding posts, fully reveal its potential.
Home theater installations also benefit from its qualities. Dialogue clarity is enhanced thanks to precise mids, while bass effects gain impact and definition.
Mastering studios and professional listening rooms are gradually adopting this technology. The neutrality of the transmission allows for precise monitoring without signal coloration.
Acoustic music enthusiasts particularly appreciate the natural reproduction of instruments. Piano, vocals, and strings reveal their nuances without artifice.
Documentation
French
Technical Specifications
Construction and Materials
- Inner conductors
- silver-plated oxygen-free copper (SPC)
- oxygen-free copper (OFC)
- Cable geometry: round
- Sheath material: plastic
Electrical Specifications
- Conductor cross-section: 2 x 2.5 mm² + 2 x 4.0 mm²
- Maximum amplifier power: up to 400 W
Connectivity
- Connectors: 2 x cable lugs and 4 x cable lugs
- Signal type: audio
- Signal direction: IN / OUT
Finishes
- Contact finish: 24-carat gold plated
General Information
- Type: pre-assembled bi-wiring speaker cable
Frequently Asked Questions
Does bi-wiring really provide an audible improvement?
The benefits depend on the system and the listener’s ear. On quality speakers with a suitable amplifier, improvements are generally noticeable: better instrument separation, tighter bass, more detailed highs. The effect is more pronounced on acoustic recordings and high-resolution systems.
Can I use this cable with any speaker?
No, the Bi-Tech 4 L absolutely requires speakers equipped with separate dual binding posts. These terminals allow for separate connection of low and high frequency paths. Speakers with a single terminal are not compatible with this technology.
How do I connect it correctly?
First, remove the metal jumpers that usually link your speaker’s terminals. Then connect the thick conductors (4 mm²) to the low-frequency terminals (often marked “Low” or “Bass”), and the standard conductors (2.5 mm²) to the high-frequency terminals (“High” or “Treble”). Be sure to observe correct positive/negative polarity.
Is this cable compatible with all amplifiers?
The Bi-Tech 4 L works with all stereo or multichannel amplifiers with standard speaker outputs. Its capacity of up to 400 watts per channel covers the vast majority of home amplifiers. Only very high-power amplifiers (>400W) may require conductors with a larger cross-section.
- Eco-contribution included in the sale price.
- Manufacturer reference: D1C10804
- GTIN / EAN: 4003635108048