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AudioQuest FLX-16/4 16-Gauge 4-Conductor In-Wall Speaker Cable

UL-approved for in-wall use; direct-burial rated (250 feet)

Item #: 703164250

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9 Reviews | Ask Questions

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Four-conductor design for simpler stereo cable runs

Cross section

Enjoy clean, detailed sound with this four-conductor in-wall speaker cable from AudioQuest. It features 19 precisely arranged, tightly packed strands in each conductor for excellent signal transfer and low distortion. Plus, twisted pair construction minimizes radio frequency and electromagnetic interference to keep your music noise-free.

Handy extras for easy installation

AudioQuest includes sequential footage markers on the cable jacket to simplify measuring. Directional arrows tell you which way the signal should flow through the cable for the best sound. Plus, with a 4-conductor cable, you can run just one cable from your amplifier or receiver to a pair of speakers or in-wall volume control, so you'll have just one cable to pull, secure, and identify.

Keep your home and family safe with in-wall-rated speaker wire

When you're running wire inside your walls, it's important that you use speaker cable that's approved for in-wall runs. This cable's CL3 certification means it passed safety tests administered by the Underwriters Laboratory (UL). The UL looks at heat generated from current flowing through wire, how quickly the cable will catch and spread fire when exposed to flame, and the wire's susceptibility to damage from external stresses. Also, be sure to check your local building and fire code and buy wire accordingly.

Product Highlights:

  • 16-gauge, 4-conductor cable (16/4)
  • UL-rated for in-wall installation
  • rated for direct burial
  • high-purity copper for high-integrity signal transfer
  • Concentric Pack stranding ensures high conductivity and low distortion
  • twisted pair construction combats interference
  • sequential footage markers printed on jacket for accurate cable measurements during installation
  • directional arrows tell you which way the signal should flow for the best sound
  • warranty: 5 years
  • Our 60-day money-back guarantee

AudioQuest FLX-16/4 16-Gauge 4-Conductor In-Wall Speaker Cable Reviews

Average Customer Review:

9 Reviews

AudioQuest FLX-16/4 16-Gauge 4-Conductor In-Wall Speaker Cable

Written by: KurtH from New Jersey on December 13, 2015

Crutchfield Customer Review (What's this?)

Used 2 spools to wire up 4 sets of Polk speakers during construction of a new house. Easy to run and saves time!

Pros: Easy to run with 4 wires inside sheathing

Cons: None

AudioQuest FLX-16/4 16-Gauge 4-Conductor In-Wall Speaker Cable

Written by: Henry from Florida on June 4, 2015

Crutchfield Customer Review (What's this?)

Great compliment to my new PolK RCs speakers!

Pros: Ease of installation

Cons: None

AudioQuest FLX-16/4 16-Gauge 4-Conductor In-Wall Speaker Cable

Written by: Anonymous from prescott az on September 6, 2014

Crutchfield Customer Review (What's this?)

excellent quality, very easy to work with

Pros: very flexible, strong outer jacket, tough but easy to strip, very easy to pull

Cons: slightly large diameter requires a larger chase, especially if pulling multiple runs

Convenient 16/4 Cable

Written by: Aaron from Felton, PA on May 6, 2013

Crutchfield Customer Review (What's this?)

Great high quality wire. Nice smooth round jacket make pulling a breeze. perfect for pulling two speaker pairs to an outdoor volume control in one wire.

Pros: Round jacket regardless of conductor count

Cons: none

Outdoor wiring

Written by: Ed from Frisco TX on May 2, 2013

Crutchfield Customer Review (What's this?)

Used this to run two speakers to an outdoor location. High quality wire that I buried. Hopefully it will last for a long time.




Written by: Anonymous from Hollywood, FL on February 19, 2013

Crutchfield Customer Review (What's this?)

Well made works as advertised.

Pros: In wall wiring

Cons: None


Written by: Rob M> from Ft. Lauderdale, FL on March 9, 2011

Crutchfield Customer Review (What's this?)

I was unable to buy this product anywhere local. Did a search, found
Crutchfield had what I needed. It was expensive, but it was top quality
and my system sounds great. Service was quick and accurate. Very Satisfied
with every aspect.



AudioQuest FLX-16/4 16-Gauge 4-Conductor In-Wall Speaker Cable

Written by: GregM from Winston-Salem, NC on September 19, 2010

Crutchfield Customer Review (What's this?)

Very pleased w/ ease of 4 wires in one, and the countdown printed on the cable to let
you know how much is left.



Awesome Surround Speaker Cable

Written by: Dinesh from Plano, TX on January 22, 2008

Crutchfield Customer Review (What's this?)

I installed this cable last month for my surround speakers (B&W) and am really enjoying some amazing clarity and definition.



Hands-on research

What's in the box?

Download owner's manual

  • 250' Spool of 4-conductor 16 gauge speaker wire

Product Research


Overview: The FLX-DB16/4 in-wall speaker cable has four 16 gauge conductors to supply wiring for two speakers, or bi-wiring for one speaker. Using Semi-Solid packing, the individual copper strands within the bundle don't change position, resulting in reduced distortion. The long grain structure in the low distortion, oxygen free, high-conductivity copper AudioQuest uses results in a natural sound, uncolored by the cable. The Star-Quad geometry lowers cable inductance, reducing susceptibility to external noise sources.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

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The AudioQuest FLX-14/4 14-Gauge 4-Conductor In-Wall Speaker Cable features 14-gauge thickness for better signal transfer.