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RCA or XLR — Which Do I Need?
The fastest way to know is to look at the back of your gear. RCA jacks are small, round, and color-coded. Red is the right channel. White or black is the left. Most home audio gear uses RCA. Higher-end preamps and integrated amps may also have XLR.
XLR jacks are larger, three-pin, and roughly cylindrical. They are often called "balanced." If both your source and your amp use RCA, get the RCA Iridium. If both use XLR, get the Iridium XLR. XLR is best for runs over 3 feet because it rejects more noise.
One caveat: some gear has both RCA and XLR outputs, but only one is true balanced. The other is just derived from the balanced signal. Check your manual or call us at 800-942-0220 if you're not sure which one to use.
What You Need to Know
What Is the Iridium Interconnect Cable — What Does It Do?
An interconnect carries music between two pieces of gear. From a DAC to an amp. From a streamer to a preamp. The cable sends a small line-level signal. Almost every home audio system needs at least one pair.
This is the RCA version of the Iridium. RCA is the most common analog audio plug. If your gear has the small, round, color-coded RCA jacks on the back, this cable fits.
The Iridium sits one rung above the entry-level Crosslink in the Cardas line. It is the most affordable Cardas cable to use Grade 1 Ultra Pure copper — the same copper used in every Cardas cable from Iridium up to the flagship Clear Beyond.
What's the Difference With Cardas Iridium Cable
The Iridium is the entry to Cardas's "good copper." Cardas Grade 1 Ultra Pure copper is 99.9999% pure (six nines). It is drawn slowly under controlled conditions. It is the same copper Cardas uses in every cable above this one.
The Iridium uses Litz wire. Litz means many small wires, each one coated, twisted together. The coating stops the wires from rusting. It also keeps each wire apart from the others. Cardas uses Litz on every cable they make.
Inside each Litz conductor, the strands grow from small in the middle to bigger on the outside. The size jump follows the Golden Ratio (1 to 1.618). Cardas has used this stranding on every cable since George Cardas's 1980s patents.
The Iridium uses a star-quad design — four conductors arranged in a square pattern. Star-quad helps the cable reject noise. The four conductors are bound in PTFE tape. Each conductor is gauge 24.5 AWG.
The shield is a hybrid. A tin-plated copper spiral wraps the conductors. Then carbon-impregnated PTFE tape adds a second layer. Together they block RFI (noise from radio, Wi-Fi, and cell signals) and EMI (noise from power transformers and motors).
The outer jacket is soft, flexible TPR (thermoplastic rubber). It feels like a real premium cable in the hand. It dresses easily behind a rack and is pleasant to handle.
The connectors on this RCA version are Cardas GRMO RCA plugs. Cardas machines these in their own shop. Each plug is hand-soldered to the wire with Cardas Quad Eutectic Solder, in Bandon, Oregon.
Cardas has been a family business for almost 40 years. George Cardas started the company in 1987. He used to be a phone-line engineer. He moved the shop to Bandon, Oregon in 1992. His daughter Angela runs it now. The Iridium is hand-built there.
Where Does the Iridium Cable Belong in Your System?
The Iridium fits mid-level systems where you want a real Cardas cable but the budget for Parsec or Clear Sky isn't there yet. Cardas designed it as an everyday cable for systems that thrive on warmth and timbre.
- Good fit: Mid-level stereo systems; integrated amps in the $1,500–$5,000 range; nice DACs and streamers; bright systems that could use a touch more warmth; systems where you want the Cardas family sound without spending more than necessary.
- Not a fit: Reference-level systems where Clear Sky or Cygnus would match the gear better; very small systems where the Crosslink may be all you need; long XLR-supported runs where XLR rejects more noise.
- Different connector? If your gear uses XLR, see the Cardas Iridium XLR sister page.
- Looking to step up? The next rung is the Cardas Parsec, which adds Cardas's Matched Propagation Conductor design.
Length: Use the shortest cable that reaches your two pieces of gear, with a little slack. See the length selector above for the SKUs we stock. Need a custom length? Call 800-942-0220.
What About the Iridium Warranty?
Cardas backs the Iridium with a lifetime warranty. The warranty covers shorts, loose plugs, and other defects in the cable itself. It does not cover normal wear, scratches, or pet damage. Cardas honors the warranty out of their Oregon shop.
If your needs change later, Cardas can re-terminate the cable. They can swap the RCAs for XLRs, or cut a long pair into two shorter pairs. Pricing varies. Call us at 800-942-0220 or contact Cardas for a quote.
Pairs Well With
Building your system? Here are some natural matches for the Iridium:
- Step up the Cardas ladder: The Cardas Parsec Interconnect is the next rung up and adds Cardas's Matched Propagation Conductor design.
- Different connector? See the Cardas Iridium XLR if your gear uses balanced connections.
- Matching power cable: The Cardas Iridium Power Cable brings the same family to your wall outlet.
- DACs and streamers: Browse the DACs and digital sources at Audio Advisor.
- Integrated amps and preamps: See our integrated amplifiers and preamps.
Features & Specifications
Conductor
Cardas Grade 1 Ultra Pure OFHC copper, 99.9999% pure (six nines), in Litz construction with SPN clear coat. Four conductors per cable, total 4 x 24.5 AWG.
Geometry
Shielded star-quad — four conductors in a square pattern, bound in PTFE tape. Gauge sizes scaled to Golden Ratio. Cross-field layer geometry inside each Litz conductor.
Dielectric
FEP jacket on each conductor. PTFE tape binding the four conductors together.
Shielding
Hybrid shield: tin-plated copper spiral plus carbon-impregnated PTFE tape. Rejects both RFI (radio, Wi-Fi, cell signals) and EMI (transformers, motors).
Connectors
Cardas GRMO RCA plugs. Machined by Cardas. The Iridium XLR sister cable uses Neutrik XLR connectors.
Termination
Hand-soldered with Cardas Quad Eutectic Solder in Bandon, Oregon.
Outside Diameter
0.300" / 7.62 mm. Light and easy to dress in tight spots.
Jacket
Ultra-soft, flexible extruded TPR (thermoplastic rubber). Premium feel in the hand.
Available Lengths
Multiple lengths stocked at Audio Advisor. See the length selector above for current SKUs. Need a custom length? Call 800-942-0220.
Warranty
Cardas Audio lifetime warranty against functional defects.
Quick-Reference Specifications
| Conductor | Cardas Grade 1 Ultra Pure OFHC copper, 99.9999%, Litz, 4 x 24.5 AWG |
| Geometry | Shielded star-quad, Golden Ratio strand sizing, Crossfield |
| Dielectric | FEP conductor jacket, PTFE tape binding |
| Shielding | Hybrid: tin-plated copper spiral + carbon-impregnated PTFE tape |
| Connectors | Cardas GRMO RCA, machined |
| Termination | Hand-soldered with Cardas Quad Eutectic Solder |
| Outside Diameter | 0.300" / 7.62 mm |
| Jacket | Ultra-soft extruded TPR (thermoplastic rubber) |
| Available Lengths | See length selector above for stocked SKUs |
| Country of Origin | Hand-built in Bandon, Oregon, USA |
| Warranty | Cardas lifetime warranty against functional defects |
Frequently Asked Questions
What components benefit most from an upgraded interconnect?
The link between your source and your amp matters most. That means the cable from a DAC, streamer, or CD player to your preamp or integrated amp. The Iridium is a strong choice for this hop in mid-level systems.
Is the XLR version a better cable than the RCA Iridium?
Generally no. The internals are very similar — same copper, same star-quad geometry, same Litz construction. The main difference is the connector. XLR can reject more noise on long runs because it carries the signal on three conductors instead of two.
My equipment has both RCA and XLR outputs. Which should I use?
If the run is over 3 feet between your two components, XLR is generally the better pick — it rejects more noise. For short runs on the same shelf, RCA does just as well. Some gear is also "true balanced" only on the XLR side, so XLR may sound better there. Check your manual.
What length do I need?
Use the shortest cable that reaches your two pieces of gear, with a little slack. Most rack systems do well with a 1-meter pair. Measure the actual path the cable will take and round up to the next length we stock.
How does the Iridium compare to the Cardas Crosslink?
Crosslink uses Cardas Grade 2 copper. Iridium uses Cardas Grade 1 Ultra Pure copper — six-nines purity. Iridium also adds a star-quad geometry and a hybrid shield. It is one rung up the Cardas ladder and is built for nicer systems.
Can Cardas re-terminate or repair the Iridium later?
Yes. Cardas offers re-termination and repair on their own cables, in their Oregon shop. They can change RCA plugs to XLRs, or cut a long pair into shorter ones. Pricing varies. Call us at 800-942-0220 for a quote.
See It in Action
Audio Advisor's video tour of the Cardas factory shows how the Iridium and the rest of the Cardas line are built — the same shop, the same hands, on every cable.
This second Audio Advisor video walks through Cardas cable construction step-by-step — Litz strands, Golden Ratio sizing, Crossfield layering, and hand-soldered terminations.
Professional Reviews
The Absolute Sound — Steven Stone, December 2020
The Absolute Sound's Steven Stone described the Iridium as a fuller, warmer cable with strong bass authority and a slightly tamed upper midrange. He recommended it for systems already leaning bright or forward, and called it well worth an audition.
The Absolute Sound — 2016 Buyers Guide to Cables
The Absolute Sound's 2016 Buyers Guide noted the Iridium continues Cardas's tradition of warmth and musicality. Compared to the older Microtwin it replaces, Iridium adds improved imaging, upgraded terminations, and a soft rubber jacket for better feel.
highfidelity.pl — Wojciech Pacuła, February 2017
Wojciech Pacuła's review for Poland's highfidelity.pl described Cardas as a competent, trustworthy maker. He noted the Iridium delivers powerful, rich bass and excellent dynamics, and called it a strong fit for systems that thrive on timbre.
Quick check before you order — RCA or XLR?
This is the RCA version of Cardas Iridium. The internals — conductors, geometry, dielectric, and termination quality — are similar to the XLR version. The difference is the connectors.
RCA and XLR are not interchangeable. Confirm both your source and your destination have matching RCA jacks before ordering. Need the XLR version? See the Cardas Iridium XLR page.
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