Choose the monitoring arrangement before comparing other interface features: two independently controlled headphone outputs suit a desk where both people regularly listen on headphones, while four line outputs give you more options for speakers or a compatible external headphone amplifier. If you also record two singers at once, check that the exact interface has two microphone-capable inputs and provides the phantom-power control your microphones require. Two headphone sockets alone do not establish that listeners can set separate levels or hear separate mixes.
If you edit harmonies side by side while both wearing headphones, separate listening levels may matter more than simply having two sockets. Solid State Logic specifies independent headphone outputs for the SSL 2+ MKII; check its cue-routing options separately if you need different mixes.
If you mix mainly through monitor speakers but also need a headphone feed for close listening or a second person, consider how the interface routes sound to each output. Focusrite says the Scarlett 4i4 4th Generation can send its headphones and line outputs their own mixes.
If the desk may later need more inputs or a separate cue mix, plan for the equipment and setup that expansion requires. Audient specifies an ADAT input on the iD14 MKII and documents assigning its headphone output to a different cue mix.
Work out who will listen on headphones, who will use speakers and whether you will record two microphones at once; those decisions determine which connections and routing controls to check.
| Concern | What to check | Who this matters to |
|---|---|---|
| Two-person headphone monitoring | Check for separate headphone level controls and, if needed, independently assignable mixes; two sockets may share one feed. | When we both edit harmonies on headphones, each of us needs a comfortable listening level. Around 36% of consumers put independent headphone monitoring first. |
| Speaker and output routing | Confirm the physical line outputs, monitor-knob behaviour and options for routing sound to speakers or a compatible headphone amplifier. | If one person uses speakers while the other listens on headphones, I need a workable route for each. For around 29% of consumers, output routing is the primary concern. |
| Two-microphone recording | Confirm two simultaneous microphone-capable inputs, suitable connectors and phantom-power controls for microphones that require 48 V. | Recording two harmony singers together means I need both microphones connected and set to suitable levels. Two-microphone capture comes first for around 21% of consumers. |
| Expansion and cue mixing | Check digital-input options, cue-mixer functions, computer compatibility and the exact model’s USB-power requirements. | I may add inputs or give a performer a different listening mix later, so I want a setup I can extend. Around 14% of consumers prioritise expansion and cue mixing. |
Solid State Logic describes the SSL 2 MKII headphone outputs as paralleled, but specifies independent headphone outputs for the SSL 2+ MKII. That distinction matters when two listeners need separate control.
Check the exact model’s level controls and cue-routing behaviour. A shared feed is suitable only if both listeners can use the same mix at a comfortable level.
An external headphone amplifier and suitable cabling may be needed if the interface has only one independently controlled headphone feed.
Line outputs are intended to feed suitable line-level equipment; they do not provide additional powered headphone sockets on their own. Focusrite lists speakers, amplifiers, mixers and external processors as destinations for the Scarlett 4i4’s line outputs.
If a second listener will use headphones, plan a headphone output or a compatible amplifier connected to an appropriate line output.
A shared desk may need different connections for microphones, headphones and monitor speakers. Focusrite instructs Scarlett 4i4 users to connect microphones with XLR-to-XLR cables.
List each device and its socket before ordering, then check which cables and headphone adaptors the complete setup needs.
Audient specifies a minimum bus-power requirement of 0.9 A at 5 V from a USB 3.0-or-better connection for the iD14 MKII. Assigning a different headphone cue mix also involves its software mixer.
Check your computer port, any hub in the connection and software compatibility before relying on that routing arrangement.
The SSL 2+ MKII is relevant when two people at one desk regularly need headphones.
The iD14 MKII is worth considering when cue-mix control and possible digital-input expansion matter alongside desktop monitoring.
The Scarlett 4i4 4th Generation suits a desk that needs two microphone inputs and flexible line-output routing.
Not necessarily: a shared feed can work if both listeners are comfortable with its mix and practical listening level. Choose independently controlled outputs when each person needs separate level control, and check cue routing separately if they need different mixes. Solid State Logic specifies independent headphone outputs on the SSL 2+ MKII.
No, line outputs do not directly become powered headphone sockets. They can feed compatible equipment, such as an external headphone amplifier; check the interface’s routing and the amplifier’s input requirements before planning a second headphone feed.
Match cables to the sockets on your exact microphones, headphones and speakers. Focusrite instructs Scarlett 4i4 users to connect microphones with XLR-to-XLR cables; also check whether your headphones need an adaptor for the interface socket and which connections your monitors accept.
Check whether each microphone requires 48 V phantom power and whether the chosen interface supplies it to the inputs you intend to use. Also confirm that both inputs accept microphones simultaneously; an XLR connector alone does not tell you whether phantom power should be switched on.