FIELD GUIDESource-led reference

P151 / Audio connections / Guide

Balanced mono is not stereo headphones

Document signal role, channel layout and power separately from connector shape.

The useful distinction

Read the exact model and physical port label, then the manufacturer description of its role.

Claim inspection dates: 2026-10-03 · Independent review pending

Guide note · not an individual product specification

The useful distinction

Understand the requirement.

A TRS form can describe different circuits; preserve the intended channel layout. [C151A]

Wired ATH-M50x headphones include a stereo 3.5 mm source connector and a quarter-inch screw-on adapter. [C151B]

Bounded facts, visible unknowns

Specifications and limits

Balanced mono is not stereo headphones facts and limitations
Workflow boundaryScoped analog audio documentation; not wiring or compatibility approval. [C151A] [C151B]
Verified device listNot included. Check exact device and accessory documentation.
A boundary, not an omission to guess around.

For the modeled wired headphones, choosing the supplied screw adapter changes the source-facing presentation of the same listening circuit. The patch sheet counts it once per physical headphone unit.

Before you connect

What to check

  1. Identify the exact device and port.
  2. Keep shared channels and controls explicit.
  3. Retain unknown power, mode and cable observations.
Trace a supported connection class →

Physical outputs and software mixes differ

An interface can expose separate sockets fed by the same playback channels. Counting the sockets does not create extra independent mixes. The worksheet checks physical allocation; it does not configure a digital audio workstation.

Keep headphone checks outside a shape match

No listening volume, amplifier power margin, headset microphone support or TRRS rewiring is inferred. Inspect the correct wired model and its supplied accessories.

Your next step

Move from the form to the requirement.

The source trail

Evidence for this page

AI-assisted inspection is not independent engineering review. Source scope and access limitations are disclosed below. Procedural checklists are editorial requirements, not hardware measurements.

C151ASource checked · pending review

The Solo 4th Gen has two balanced rear line outputs and a front stereo headphone output.

Focusrite · Solo 4th Gen specifications ↗

Locator: Physical and electrical characteristics; Scarlett Solo channel order
Access: public page. No headphone loudness, gain sufficiency or actual driver behavior is calculated.

S136: full source recordInspect review dependencies → (private workspace)

Claim scope: Exact-model analog audio reference; no end-to-end compatibility or electrical approval.. Next review due 2027-01-01.

C151BSource checked · pending review

Wired ATH-M50x headphones include a stereo 3.5 mm source connector and a quarter-inch screw-on adapter.

Audio-Technica · ATH-M50x wired professional monitor headphones ↗

Locator: Specifications: connector and accessories included
Access: public page. Headphone-side locking connector is not modeled. No acoustic output or amplifier suitability is inferred from connector fit.

S142: full source recordInspect review dependencies → (private workspace)

Claim scope: Exact-model analog audio reference; no end-to-end compatibility or electrical approval.. Next review due 2027-01-01.

Suggest a correction to this field note →

Audio connection desk

Follow the signal beyond the plug

Signal roles, channel layouts and power requirements are distinct from connector shape. No hardware approval is implied.

Evidence behind this page

Scope first. Source second. Approval separate.

2 linked sources · 2 scoped claims · 0 sources with inspection/access flags.

Page scope: consumer_reference_expansion

Assessment 2026-10-22 · earliest scheduled source review 2027-01-01. This is a recorded-date assessment, not a live source check. Page-level independent review is not established by this panel.

Inspect 2 source scopes, access limits and dates

S136 · Solo 4th Gen specifications

Focusrite · Manufacturer / product-owner domain · inspected 2026-10-03 · due 2027-01-01

Within inspection window

Scoped support: Solo 4th Gen output roles and channel order.

Not established / limitations: No headphone loudness, gain sufficiency or actual driver behavior is calculated.

Locator: Physical and electrical characteristics; Scarlett Solo channel order

S142 · ATH-M50x wired professional monitor headphones

Audio-Technica · Manufacturer / product-owner domain · inspected 2026-10-03 · due 2027-01-01

Within inspection window

Scoped support: Wired ATH-M50x source-end plug and supplied adapter, not Bluetooth models.

Not established / limitations: Headphone-side locking connector is not modeled. No acoustic output or amplifier suitability is inferred from connector fit.

Locator: Specifications: connector and accessories included

Trace 2 claims to their source records

C151A · P151

The Solo 4th Gen has two balanced rear line outputs and a front stereo headphone output.

Claim scope: Exact-model analog audio reference; no end-to-end compatibility or electrical approval.

Source links: S136 · Evidence trail → (private workspace)

C151B · P151

Wired ATH-M50x headphones include a stereo 3.5 mm source connector and a quarter-inch screw-on adapter.

Claim scope: Exact-model analog audio reference; no end-to-end compatibility or electrical approval.

Source links: S142 · Evidence trail → (private workspace)

Prepare this page for review → (private workspace)Read the evidence method →

Recorded evidence only. An inspection date, publisher label, source link or generated packet is not independent technical review, hardware testing, fabrication approval or a compatibility verdict.