Audio/Connector/Q/What is the difference between a line out port and a headphone port, and how do they differ on the Zoom H5?

• What is the difference between an Audio/Connector/Line/Out/Port and an Audio/Connector/Headphone/Port, and how do they differ on the Zoom H5?

  • AI Answer

    • Short answer: a line out hands a signal to another device's input; a headphone out hands a signal to a pair of transducers. A headphone jack is a line out with a small power amplifier and a volume control in front of it. On the Zoom H5 the two are separate Audio/Connector/Phone/TRS/3.5mm jacks with independent level controls, so the recorder can feed a camera or an interface at a steady level while headphone volume moves freely.

    • The general difference

      • Trait	Line out	Headphone out
        Meant to drive	the input stage of another device, 10 kΩ and up	headphone drivers, roughly 16–300 Ω
        Behind the jack	a buffer, with no power amplifier	a buffer plus a small power amplifier
        Rated in	volts, against a nominal reference such as −10 dBV or +4 dBu	milliwatts into a stated load
        Level control	fixed, or a trim set once at setup	a volume knob, moved while listening
        Signal shaping	none; flat at a known reference level	varies with the load, and clips before the line stage does

      • The distinction is about current, not voltage. Both jacks swing about a volt. Only the headphone amplifier can push that voltage into a 32 Ω load without collapsing, which is why a line out asked to drive headphones goes quiet and loses its bottom end: the low impedance of the headphones loads the output stage down.

    • What happens when the two are swapped

      • Headphone out into a line in works, and is the everyday field rig. The cost is that one knob now sets two things — turn the monitoring down and the recording gets quieter. A headphone amplifier is also noisier and clips earlier than the line stage on the same device.
      • Line out into headphones is quiet and thin, and on a high-impedance pair close to inaudible. Nothing is damaged; there is simply not enough current.
      • Line out into a mic input is the opposite problem. Line level runs roughly 30–40 dB hotter than a mic input expects, so it distorts unless something pads it down.

    • On the Zoom H5

      • The H5 carries both, as two separate unbalanced 1/8 in (3.5 mm) stereo jacks:

      • Jack	Maximum output level	Output impedance	Level set by
        Zoom H5/Port/Line Out	+1 dBu	110 Ω or less	the LINE OUT LEVEL menu setting
        Zoom H5/Port/Headphone	20 mW + 20 mW into 32 Ω	10 Ω or less	the physical volume buttons

      • Answer/Official from the H5 Operation Manual: LINE OUT LEVEL sits under the IN/OUT menu and runs from −30 to 0 dB. Its stated purpose is feeding "the external mic input jack on an SLR camera or other jack with a high input gain" without an attenuator cable in the line — the H5 pads its own line out rather than asking for a resistive cable.
      • The manual is explicit that the two outputs are independent: the LINE OUT LEVEL setting "does not affect the level output from the PHONE jack." That independence is the practical payoff, and it is what makes a simultaneous send-and-monitor rig possible on this recorder.
      • Both jacks are live at once, so a single H5 can feed a camera or interface from LINE OUT while the performer or engineer monitors on PHONE.

    • Scope of this answer

      • Output specifications come from the H5 operation manual and Zoom's published spec sheet, read September 2026. The line-versus-headphone distinction itself is general audio practice rather than a Zoom rule.