Few topics divide audiophiles like cables. Some insist a $2,000 power cord transformed their system; others point to measurements and dismiss the entire category as snake oil. The truth, as usual, sits in the middle: cables matter, but only in specific, predictable ways. This guide breaks down the three cable categories — interconnects, speaker wire and power cords — explains what the specifications actually mean, and tells you exactly where it is (and is not) worth spending money.
1. The Three Cable Categories at a Glance
| Category | What It Connects | Signal Type | Where It Matters Most |
|---|---|---|---|
| Interconnect (RCA / XLR) | Source or DAC → preamp / power amp | Low-level analog (line level) | Long runs, electrically noisy environments, balanced systems |
| Speaker wire | Amplifier → loudspeakers | High-current analog (amplified) | Long runs, low-sensitivity speakers, high-power systems |
| Power cord | Wall outlet → component | AC mains | Far less than most think — internal PSU design dominates |
2. Interconnects: RCA vs XLR and What Shielding Actually Buys You
Interconnects carry line-level signals — the weakest link in the chain, and therefore the most sensitive to interference. Two choices matter here: the connector type and the cable construction.
| Aspect | RCA (unbalanced) | XLR (balanced) |
|---|---|---|
| Signal conductors | 1 signal + 1 ground/shield | 2 signal (hot/cold, inverted) + 1 ground |
| Noise rejection | None inherent — relies on shielding | Common-mode rejection cancels induced noise |
| Safe cable length | Up to ~2-3 m | 10 m+ without degradation |
| Output level (typical) | 2.0 Vrms | 4.0 Vrms (6 dB more headroom) |
| Connector quality matters | Yes — contact and shielding | Less critical — rejection is electrical |
Practical takeaway: in a typical home setup with runs under 2 meters, a well-made RCA cable performs perfectly well. Balanced (XLR) earns its keep when cables run near power cables, across rooms, into active studio monitors, or when you simply want the lowest possible noise floor. On TRASAM’s DS8, for example, the XLR outputs deliver 4.0 Vrms with a 134 dB signal-to-noise ratio, versus 2.0 Vrms on RCA — a difference that matters for long runs and pro-style monitoring, but is subtle on a 1.5 m desktop connection.
3. Speaker Wire: Gauge, Length and Material — The Only Table You Need
Speaker wire carries high current, so the governing spec is simple: resistance. Thicker wire (lower AWG number) means less resistance, and less power wasted as heat. The table below tells you what gauge you actually need for a given run length.
| Run length | Recommended gauge | Why |
|---|---|---|
| Under 3 m (typical desktop) | 16 AWG | More than sufficient at these distances |
| 3-8 m (typical living room) | 14 AWG | Keeps resistance well below 0.1 Ω per metre |
| 8-15 m (large rooms, bi-wire) | 12 AWG | Large-diameter conductor for long high-current runs |
| 15 m+ (unusual) | 10 AWG | Only needed for extreme distances |
- Material: Oxygen-free copper (OFC) is the sensible baseline; silver-plated copper and pure silver offer marginal gains at significant cost. Do not pay a premium for “audiophile” metallurgy on short runs.
- Termination: Banana plugs or spade lugs make installation clean; bare wire into quality binding posts (like the gold-plated terminals on TRASAM amplifiers) is electrically identical.
- Bi-wiring: If your speakers have separate terminals for high and low drivers (TRASAM U16 and U13 support bi-wiring), two pairs of speaker wire are needed — but the audible benefit of bi-wiring versus a quality jumper is debated.
4. Power Cords: Where the Industry’s Biggest Marketing Lives
Of the three categories, power cords are where marketing is most aggressive and measurable benefit is smallest. Here is the honest engineering picture: a well-filtered, well-regulated internal power supply (like the dual toroidal transformers in TRASAM’s AA2PRO or the dual O-type transformers in the AA3PRO) already rejects most mains noise before it reaches the audio circuits. What a power cord can add in practice:
- Good shielding of the cord itself reduces radiated interference pickup — real, but only audible in electrically noisy rooms.
- Proper gauge and quality connectors prevent voltage drop and intermittent contact — worthwhile on high-current amplifiers.
- Exotic materials and “directionality” claims have no scientific support. Save that money for a better source or speakers.
5. How Much Should You Spend? A Sane Budget Table
| System investment | Sane cable budget | Priority order |
|---|---|---|
| Under ¥10,000 | ¥200-500 total | Decent 14 AWG speaker wire + basic shielded RCA |
| ¥10,000-30,000 | ¥500-1,500 | Good OFC interconnects, XLR if runs are long, quality speaker wire |
| ¥30,000+ | ¥1,500-5,000 | High-quality balanced interconnects, premium speaker wire, clean power strip |
Rule of thumb: cables should never exceed roughly 5% of your system’s value. If a cable costs more than your amplifier, you have the priorities backwards.
6. What a TRASAM System Actually Needs
TRASAM components illustrate the practical side of cable selection better than theory ever could:
| Component | Outputs / Inputs | Cable recommendation |
|---|---|---|
| DS8 flagship streamer-DAC | 2× XLR (4.0 Vrms) + 2× RCA (2.0 Vrms), 4 simultaneous outputs | XLR to amps for multi-room or long runs; RCA for short desktop chains |
| MP10 all-in-one streamer | XLR (4.4 Vrms) + RCA (2.2 Vrms) | Standard quality interconnects to any amp |
| AA3PRO / AA2PRO power amps | XLR + RCA inputs, gold-plated speaker terminals | Balanced input recommended (noise floor 40 µV vs 120 µV on AA3PRO); 14 AWG speaker wire |
| A12PRO / A11PRO integrated amps | 5 digital + 4 analog inputs, SUB OUT × 2 | USB/coax for digital; RCA for CD/AUX; 14 AWG to speakers |
| U16 / U13 / TL6 speakers | Bi-wire capable (U16/U13), standard terminals (TL6) | 12-14 AWG OFC; bi-wire optional |
7. Five Common Cable Myths, Answered
| Myth | Reality |
|---|---|
| “More expensive cable always sounds better” | Once resistance, shielding and contacts are adequate, audible differences shrink to near zero |
| “XLR is always better than RCA” | Balanced wins on long runs and noise; on a 1 m desktop run the difference is negligible |
| “You need $1,000 speaker wire” | Correctly gauged 14 AWG copper outperforms boutique wire on measurable specs |
| “Digital cables don’t matter” | Digital links are bit-perfect when the receiver locks on; use quality shielded USB/coax and skip exotic options |
| “Power cords dramatically change the sound” | With a well-designed internal PSU, a cord’s contribution is minimal; invest in the PSU instead |
8. Bottom Line
Cables are a real but limited factor in a HiFi system. Spend sensibly: correct gauge speaker wire, shielded interconnects, balanced connections where runs are long, and reasonable power cords — then put the remaining budget into the components that actually make the music. With TRASAM’s balanced-output DACs and low-noise power amplifiers, you get a system whose internal design already handles most of what cables are often blamed for.
