F-Type Adaptors Explained: When and How to Use Them
By AudioQuest | Published: 2026-10-15
Category: How-to Guides
An F-type adaptor connects coaxial cables to TVs, antennas, and digital audio gear. Learn the exact steps to choose and install one without signal loss.
Quick answer
An F-type adaptor changes the connector on a coaxial cable so it fits a different jack, most often an F-type to RCA or a 90-degree right-angle turn. Buy one only when the jack types genuinely differ, keep the adaptor short and fully seated, and avoid stacking two adaptors in a row because each junction adds loss and a possible loose ground.
Identify the connector before you buy anything
F-type connectors are the threaded, 75-ohm fittings you see on TV wall plates, antenna feeds, and cable modems. RCA jacks are the push-on, usually color-coded connectors on TVs, receivers, and subwoofers. A coaxial digital adapter is only needed when those two worlds meet, for example running an antenna feed into a device with an RCA-style input or feeding a subwoofer line from a coaxial wall plate.
Check the gender as well as the type. An F-type jack is female, and most F-type adaptors present a male F connector on one end. If you chain two male ends together, you need a barrel coupler instead of an adaptor. Getting gender wrong is the single most common reason a coaxial cable connection will not seat.
Match impedance and shield quality to the signal
Video and digital audio over coax expect 75 ohms. A cheap adaptor that does not hold that impedance can cause reflections, which show up as sparkles on a TV picture or dropouts in a digital audio stream. Look for a metal-bodied adaptor rather than a plastic shell, because the metal body also helps shield the center conductor from interference.
For a TV antenna cable adapter used outdoors or in a wall box, the mechanical fit matters as much as the electrical spec. A loose F connector lets moisture and stray RF into the joint, so choose one that threads on fully and stays tight.
Install and test in the right order
Power down the TV, receiver, or antenna amplifier before you connect anything. Thread the F side on by hand until it is finger-tight, then push the RCA side on firmly. Do not use pliers on F connectors; over-tightening crushes the shield and can crack the center pin.
After connecting, run a signal check. For a TV, open the channel signal-strength menu and confirm the level is similar to a direct connection. For digital audio, play a known track and listen for dropouts. If the signal is worse than before, reseat both ends before assuming the adaptor is faulty.
Know when an adaptor is the wrong tool
If you are running a long cable from a subwoofer output to a subwoofer, an RCA cable is the correct part, not an F-type adaptor. If you are joining two coaxial cables, use a proper barrel coupler. And if you need a right-angle turn in a tight cabinet, a dedicated 90-degree adaptor is cleaner than bending the cable, which stresses the center conductor.
Step-by-step: installing an F-type adaptor
- Step 1: Confirm the jack types: Look at the device port and the cable end. If both are F-type, you need a coupler, not an adaptor. If one is F-type and the other is RCA, an F-type to RCA adaptor is correct. Checkpoint: if you cannot tell the difference by sight, photograph both ends and compare before ordering.
- Step 2: Choose the right angle and body: Pick a straight adaptor when there is room, and a 90-degree version such as the AudioQuest F-90° when the cable would otherwise bend sharply against a wall or cabinet. Checkpoint: a metal body and a snug thread are better signs of quality than a low price.
- Step 3: Power down and connect: Turn off the TV, receiver, or amplifier. Thread the F side on by hand until finger-tight, then push the RCA side fully onto its jack. Checkpoint: never use pliers on F connectors; hand-tight is enough.
- Step 4: Test the signal: Check the TV signal-strength menu or play a known audio track. Compare against a direct connection if you can. Checkpoint: if signal quality drops, reseat both ends before blaming the adaptor.
- Step 5: Decide whether an adaptor belongs at all: If you are connecting a subwoofer or line-level source, use an RCA cable such as the Boxer RCA or Big Sur RCA instead of adapting a coaxial feed. Checkpoint: adaptors fix connector mismatches, they do not replace the correct cable.
Product facts
- F-90˚: The AudioQuest F-90° is an F-Type adaptor listed as a Standard option with SKU M21FF90S. A right-angle F-type adaptor solves clearance problems behind wall-mounted TVs and shallow cabinets without forcing a sharp bend in the coaxial cable.
- Boxer RCA Factory Certified Refurbished: The Boxer RCA Factory Certified Refurbished uses solid 1.25% silver-plated copper conductors and a carbon-based 3-layer noise-dissipation system. If your signal path ends in an RCA subwoofer input rather than an F connector, this is the correct cable to use instead of adapting a coaxial feed.
- Big Sur RCA > RCA Factory Certified Refurbished: The Big Sur RCA > RCA Factory Certified Refurbished uses solid Perfect-Surface Copper+ conductors and metal-layer noise-dissipation. For line-level RCA connections, a purpose-built RCA cable keeps the signal balanced and shielded, which an F-type adaptor cannot do on its own.
