black · pair (active L + passive R) · UK/Ireland
The HS4 is a compact two-way desktop studio monitor pair: the left cabinet holds a class-D amplifier rated 26 W + 26 W (dynamic, 6 Ω) and feeds the passive right cabinet over a supplied speaker cable. Each cabinet has a 4.5-inch cone woofer and 1-inch dome tweeter.
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Specifications checked 26 Sept 2026Manufacturer specifications, not a hands-on test.
Balanced XLR/TRS combo inputs sit alongside RCA and 3.5 mm stereo-mini inputs on the left speaker, so an audio interface, a computer and a phone can all be connected.
A front-panel volume knob and headphone socket, plus rear ROOM CONTROL and HIGH TRIM switches, cover desk use and placement near walls.
Sold as a complete pair with a speaker cable, a stereo mini-to-RCA cable and anti-slip pads; Yamaha lists 60 Hz – 22 kHz at −10 dB.
Only the left speaker is powered, and one volume knob sets both channels, so the pair cannot be split across separately amplified positions.
No Bluetooth, USB or optical input is listed, and XLR/TRS cables are not supplied.
The mains cord's plug is regional and Yamaha says to use the unit at the voltage marked on its rear panel.
Exact configuration: black · pair (active L + passive R) · UK/Ireland
19 specifications in 7 groups. Values are manufacturer specifications unless a row says “Measured result” or “Calculated from cited specifications”.
Packaged and sold as a pair. The right speaker is fed from the left speaker's SPEAKER OUTPUT over the supplied speaker cable; one amplifier drives both speakers.
LF cone diameter per speaker.
HF dome diameter per speaker.
Manufacturer limits at −3 dB; not interchangeable with the −10 dB range.
Manufacturer limits at −10 dB.
Analogue wired inputs only; no Bluetooth, USB or optical input is listed. The passive right speaker has only a speaker input from the left speaker.
Measured peak, IEC noise at 1 m, as stated by Yamaha.
Manufacturer amplifier ratings per channel into a 6-ohm load, from the single amplifier in the active left speaker. The dynamic figure is not continuous power; the 20 W figure is at 0.1% THD at 1 kHz. Not a loudness or mains-consumption figure.
Yamaha states the plug shape differs by locale, so UK/Ireland and US units ship with different plugs. Although the unit works between 100 and 240 V, Yamaha says to use it at the supply voltage indicated on its rear panel because limiter settings vary with voltage; do not assume cross-region use. The passive right speaker has no mains connection.
Rated consumption for the pair (single amplifier). Manual lists standby 0.47 W and 0.0 W with the rear switch off.
Manual switches, not automatic room correction. One volume knob controls both channels.
Per cabinet; the two cabinets share width and height but differ in depth.
Net weight of the active left speaker; the passive right speaker weighs 3.1 kg. No pair or packaged weight is published.
Net weight of the passive right speaker.
XLR/TRS cables for studio interfaces are not included.
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