99.9% Pure Copper · Audiophile Grade

OFC Oxygen-Free Copper Speaker Wire

99.9% oxygen-free copper means the lowest resistance and cleanest signal. CL2, CL3, outdoor, and banana-plug builds available.

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  • ★ ETL listed · UL standards

Overview

What makes OFC worth the upgrade

Oxygen-free copper is produced by melting copper in an oxygen-free environment, then casting and drawing it under controlled conditions that prevent oxide formation in the grain structure. The result is 99.9%+ pure copper with resistivity roughly 2–3% lower than standard electrolytic copper — and more importantly, without the grain-boundary oxides that cause resistance to increase over time.

In practical terms: lower resistance means less voltage drop over a given run length, more current delivery to the speaker, and better damping factor (the amplifier's ability to control speaker cone movement). The difference is audible on long runs, with high-power amps, and on speakers with complex impedance curves.

GEARit's OFC lineup covers every application: CL2-rated in-wall builds in white, CL3-rated outdoor and direct burial builds in black and brown, marine-grade tinned-copper builds, and pre-terminated banana-plug cables. All share the same 99.9% OFC conductor spec.

For runs under 30 ft at modest power levels, you can save money with CCA. For anything longer, higher-powered, or going into a wall you don't plan to re-open, OFC is the correct choice — the marginal cost difference is negligible against a 10-year install life.

Two-step picker

Two questions decide the right speaker wire.

How long is the run and how much power the amp pushes. Use the picker, then choose the conductor that fits the budget and the room.

1 Pick the gauge 2 Pick the conductor
1 Step 1 · Pick the gauge

Thicker wire = lower resistance = cleaner power.

Every foot of speaker wire adds a tiny amount of resistance between the amp and the driver. The longer the run and the higher the wattage, the thicker the conductor needs to be to keep voltage drop under 5%.

  • Short runs (<50 ft): 16 AWG is plenty.
  • Most home theaters: 14 AWG sweet spot.
  • Long / high-power runs: step up to 12 or 10 AWG.
Interactive · gauge picker

Tell us the run. We'll size the wire.

5 ft
5 ft50100150200+ ft
Amplifier power per channel
Recommended
14 AWG OFC OFC speaker wire

Short home-theater run — 14 AWG OFC is the sweet spot for 5.1 / 7.1.

Shop 14 AWG OFC
2 Step 2 · Pick the conductor

OFC vs CCA — the single biggest sound-quality decision.

Copper-clad aluminum looks like copper but is mostly aluminum, with roughly 60% more resistance. Over a 50 ft run pushing real wattage, you can measure (and hear) the difference.

Interactive · conductor picker

What are you wiring up?

Pick the scenario that fits and we'll tell you which conductor wins.

Recommended · OFC
OFC — the home-theater standard.

5.1 / 7.1 receivers and longer runs to surrounds reward pure copper. Lower resistance means cleaner dialogue, tighter bass, and full headroom on dynamic scenes.

Shop OFC speaker wire
SPEC
OFC PICK
Oxygen-Free Copper
CCA PICK BUDGET
Copper-Clad Aluminum
Conductor
99.9% pure copper
Aluminum core, copper skin
Resistance vs OFC
Baseline (lowest)
≈ 60% higher
Best run length
Up to 200+ ft
Under 50 ft
Power handling
Any amp, any speaker
Low to mid power
In-wall code
CL2 / CL3 available
Indoor short runs
Recommended for
Home theater · pro · outdoor
Budget DIY · cars

Top picks

OFC Oxygen-Free Copper Speaker Wire — top picks.

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FAQ

Questions buyers actually ask.

What does oxygen-free actually mean for speaker wire?
Standard copper contains trace amounts of dissolved oxygen in its grain structure. Oxygen-free copper is refined to remove that oxygen, resulting in 99.9 percent or higher purity. The practical effect is lower electrical resistance, better conductivity, and less tendency for the copper to oxidize internally over time.
Can I hear the difference between OFC and regular copper?
On short runs with typical home theater receivers, the difference is small. Where OFC becomes clearly audible is on runs over 50 feet, with high-power amplifiers, and in systems with low-impedance speakers. Lower resistance means the amplifier maintains better control over the speaker cone, which shows up as tighter bass and cleaner dynamics.
Is OFC worth the extra cost for a permanent in-wall install?
Yes, for a permanent install it is worth it. The marginal cost over CCA is small compared to the cost of re-pulling cable if you ever upgrade your system. OFC also does not corrode at the terminations the way CCA can over years, so the connection quality stays consistent.
Does OFC speaker wire work with 4-ohm speakers?
Yes, and it is actually the better choice for 4-ohm loads. Lower-impedance speakers draw more current, which makes wire resistance a bigger factor. OFC at the correct gauge keeps that resistance low and gives your amplifier the headroom it needs to drive 4-ohm loads cleanly.
How do I choose between the different OFC products you carry?
The main variables are gauge, jacket rating, and format. Use the gauge calculator on our speaker wire page to find the right AWG for your run length and amp power. Then choose CL2 for in-wall, CL3 for outdoor or direct burial, and pre-terminated banana plug cables if you want a quick plug-and-play connection. Email support@gearit.com if you want a recommendation for your specific setup.