Experience audio at the next level with the TRN BAX Pro, the flagship hybrid in-ear monitor (IEM) from TRN. With a 5-driver configuration (2 Balanced Armature + 1 Dynamic Driver + 2 Electrostatic) on each side, and a unique six-mode tuning system, the BAX Pro is built for audiophiles, stage monitoring, and serious music lovers alike. It balances clarity, precision, and flexibility in a robust yet compact metal housing.

Key Features & Highlights

• Hybrid 5-Driver Architecture
  Each earpiece contains:
    • 2 × Knowles BA drivers (one for midrange, one for high)
    • 1 × 10 mm dual-magnet beryllium diaphragm dynamic driver for bass and lower spectrum
    • 2 × Sonion electrostatic (EST) units for ultra-high frequency clarity and extension

• Six Tuning Modes via Three Switches
  A three-position switch arrangement lets users choose from six distinct sound signatures (e.g. “Electronic,” “Transparency,” “Atmospheric Enhancement,” “High Frequency,” “Equalization,” “Low Frequency”) to adapt the tonal balance to different genres or listening preferences.

• Lightweight & Premium Metal Shell
  The IEM shells are CNC-machined from an aluminum-magnesium alloy, offering high strength, corrosion resistance, and a lightweight build. The semi-open faceplate helps relieve pressure and deliver a more natural acoustic feel.

• Detachable 8-Strand 6N Single Crystal Copper Cable
  Comes with a detachable cable made of eight strands of high-purity single-crystal copper. The connectors are modular, allowing you to use 3.5 mm, 2.5 mm, or 4.4 mm plugs depending on your audio source.

• Ergonomics & Weight
  Each earpiece weighs approximately 8.7 g.The acoustic design and semi-open cover help reduce ear fatigue over long sessions.

• Broad Frequency / Sensitivity / Impedance
  • Frequency response: 7 Hz – 40,000 Hz
  • Sensitivity: 114 dB/mW
  • Impedance: 32 Ω

  
  

What’s in the Box

• 1 × TRN BAX Pro (left + right earpieces)

• Detachable 8-strand single crystal copper cable (1.2 m ± 3 cm)

• Modular termination plugs: 3.5 mm, 2.5 mm, 4.4 mm

• 8 pairs of eartips:
    • Balanced (S / M / L)
    • T-set (S / M / L)
    • Foam tips (M)

• Aluminum storage case

• Tuning switch tool / card (for safe adjustment)

Sound Character & Use Cases

The TRN BAX Pro offers a versatile tonal palette thanks to its tuning switches and hybrid driver setup. Reviews note:

• A transparent, slightly warm base sound in default (“Equalization”) mode.

• Strong imaging and a wide, holographic stage with good spatial layering.

• Treble is articulate and extended, especially with EST drivers; users should manage volume if sensitive to high frequency brightness.

• The bass has good depth and impact, though in some modes the low end may feel more emphasized or “fun” depending on eartips and switch settings.

• Sensitivity to ear tip choice, insertion depth, and switch configuration—these factors significantly affect tonal balance.

• Some users mention that the tuning switches are small and delicate and best manipulated with the included tool.

Given its flexibility, the BAX Pro is suitable for:

• Audiophiles who want tweakability

• On-stage monitoring or live performance environments

• Critical listening and reference use

• Multi-genre listeners who enjoy switching between tonal signatures

Tips & Notes for Listing / Users

• Caution when switching modes: Use the provided plastic card / tool to avoid damaging the switches.

• Eartip choice matters: Dense foam tips tend to add warmth and fullness, while stock silicone tips preserve clarity.

• Fit & isolation: Because of the shape and size, some users may experience less noise isolation or challenging fit in certain ears.

• Power source: With 32 Ω and 114 dB sensitivity, the BAX Pro is reasonably easy to drive with portable players or high-output smartphones / DAPs.

• Break-in: Some users note tonal shifts during the first 20–50 hours of listening as drivers settle — particularly in bass and treble extremes.