ACCESSORY
Inline Adapter: 2.5 mm TRRS → 4.4 mm Pentaconn Balanced
Specifications
| Category | Adapter |
|---|---|
| Brand | Studio Reference |
| Material | Brass body, 24K gold-plated contacts |
| Sizes | one size |
| Use case | Connect legacy 2.5 mm balanced IEM cables to modern 4.4 mm Pentaconn DAPs. |
| Price (USD) | $39 |
Overview
Polarity-correct inline adapter that maps a 2.5 mm TRRS balanced female receptacle to a 4.4 mm Pentaconn male plug. L+/L−/R+/R− route 1:1; the shield is grounded on the 4.4 mm side only to preserve the differential signal integrity. Brass body with gold-plated contacts.
The single most-used adapter in the modern portable-audio ecosystem: it lets a legacy 2.5 mm balanced IEM cable plug into any post-2018 DAP, dongle DAC or desktop amp that ships with 4.4 mm Pentaconn balanced output.
See the 4.4 mm vs 2.5 mm balanced explainer for the engineering rationale. For the reverse direction see 4.4 mm → 2.5 mm adapter below.