Group listening amplifiers commonly provide four independent headphone outputs with individual rotary volume controls so each listener can set their own level.
Some amplifiers include multiple selectable gain settings; one example lists four gain positions at 0 dB, 6 dB, 12 dB and 18 dB, while others list single numeric gain values such as 11 dB.
Commercial mixer-amplifiers in this set support traditional low-impedance speaker loads (8 Ω and 4 Ω) and also distributed-audio 70V and 100V systems for installed audio.
Product details show common connectors include 3.5 mm and 6.3/6.35 mm headphone jacks, paired RCA inputs and RCA loop/outputs, and USB-C adapters with built-in DAC/AMPs for USB-C sources.
Product details show a mix of connectivity: paired RCA inputs and RCA loop/outputs, 3.5 mm and 6.35 mm headphone jacks, 1/4" (6.3 mm) TRS headphone outputs on multi‑channel units, RJ45 ports for remote volume control, and balanced mic/line inputs on mixer‑amps.
