Introduction

Yamaha revolutionised the desktop amp segment with the original THR series more than ten years ago. Today, the THR30II Wireless pushes the concept further still: 2 × 15 W stereo, advanced modelling, a built-in Line 6 wireless system, a full control app and battery operation.

At €599, it is one of the most expensive desktop amps on the market. But does it offer enough to justify that premium price? After two months of daily use, here is our full verdict.

Design and build

A beautiful object

The THR30II Wireless is quite simply gorgeous. Its retro-futuristic design, with a beige cloth grille, brushed metal controls and subtle LED lighting, makes it an object you will be proud to display on your desk.

The dimensions (42 cm wide) are perfect: compact enough for a desk, substantial enough to have presence. The 3.2 kg weight inspires confidence without penalising portability.

Premium construction

Build quality is faultless:

  • A robust metal chassis
  • Notched metal knobs with a satisfying feel
  • A quality acoustic cloth grille
  • Non-slip rubber feet
  • Impeccable finishing with no visible defects

This is Yamaha in all its glory: meticulous Japanese engineering, built to last. You immediately feel you are not dealing with a plastic gadget.

Front panel ergonomics

The control panel is clear and logical:

  • Main knob: selects the 8 amp channels
  • Gain, Master, Bass, Middle, Treble: classic 3-band EQ
  • Effect: selects and sets the level of effects
  • Echo/Reverb: dedicated control for delays and reverbs
  • Master volume: overall output level

A system of coloured LEDs indicates the selected channel and the active effects. It is elegant and functional.

The wireless system: a game changer

Line 6 Relay G10TII included

This is the signature feature of the THR30II Wireless. The Line 6 Relay G10TII transmitter (normally sold separately at around €120) plugs straight into your guitar and transmits the signal wirelessly to the amp.

Huge advantages:

  1. Total freedom: move around the room freely, play from the sofa
  2. Built-in charging: the transmitter charges when plugged into the amp
  3. Imperceptible latency: under 2 ms, absolutely inaudible
  4. Range: 30+ metres in optimal conditions
  5. Reliability: not a single dropout in 2 months of testing

Performance

The tone suffers no degradation compared with a cable. The bandwidth is complete, the dynamics preserved, and no hiss is added. It is technologically impressive.

For a desktop and home studio amp, that freedom is a game changer. No more cables underfoot, no more positioning constraints. Plug in the guitar, settle in comfortably, and play.

Bluetooth audio

Alongside the guitar wireless, the THR30II carries Bluetooth 5.0 for streaming audio from a phone or tablet. Reproduction quality is excellent, with stereo speakers that genuinely make a difference.

Perfect for playing over backing tracks from YouTube or Spotify, or simply listening to music when you are not playing.

Sound quality: the heart of the matter

The speakers

The two 8 cm full-range speakers developed specifically for this series are remarkable. In a true stereo configuration with 15 W per channel, they offer:

  • Exceptional clarity across the whole frequency range
  • Impressive stereo imaging for the size
  • Remarkable definition even at low volume
  • Surprisingly present bass for 8 cm drivers
  • Enough volume for a home studio or a small jam

The amp models

Yamaha offers 8 carefully selected channels:

1. CLEAN — Fender-style

A crystalline, dynamic tone, perfect for jazz, funk and pop. Playing nuances are beautifully rendered.

2. CRUNCH — British crunch

Classic blues rock, seventies rock, excellent dynamics with the volume control. Think Marshall JTM45.

3. LEAD — British high gain

Eighties rock, hard rock. Generous sustain, present mids. Marshall JCM800 territory.

4. HI GAIN — Modern high gain

Modern metal, djent. Tight, precise, plenty of gain available with no mush.

5. SPECIAL — Boutique/Dumble-style

A creamy tone with natural compression, for blues, fusion and melodic rock.

6. BASS — Bass amp

Genuinely usable for bass. Excellent definition, deep lows.

7. ACO — Acoustic

Simulates an acoustic guitar amp. Adds compression and presence.

8. FLAT — Neutral monitoring

For plugging in a synth or an audio player, or using the amp as a monitor.

Tonal verdict

Yamaha’s models are natural, musical and responsive. They are not carbon copies of the original amps, but high-quality interpretations that sound good in every context.

At low volume (the typical condition for a desktop amp), the THR30II is striking. Where many amps lose their character quietly, this one keeps body, dynamics and expressiveness.

The effects: complete and convincing

Modulation

  • Chorus: rich and dimensional
  • Flanger: classic jet plane
  • Phaser: excellent vintage seventies
  • Tremolo: gentle or intense, very musical

Delays

  • Echo: a classic delay, very versatile
  • Echo/Rev: a combination of delay and spatial reverb

Reverbs

  • Spring reverb: perfect surf guitar
  • Hall reverb: a natural large room

Utilities

  • Compressor: subtle, useful for clean and country
  • Noise gate: effective on the high-gain channels

All these effects are high quality, well above the cheap effects often found on small amps. They genuinely improve the tone rather than degrading it.

The THR Remote app: essential

Total control

The THR Remote app (free, iOS/Android/Mac/Win) unlocks the amp’s real potential:

  • 5 amps per channel (instead of just one by default)
  • A complete effects chain: up to 5 simultaneous effects
  • Advanced parameters: sag, bias, presence and more
  • A preset library: hundreds of ready-made sounds
  • Preset creation: unlimited saving
  • A visual editor: an intuitive drag-and-drop interface

USB connection

Over USB, the THR30II becomes a full 2-in/2-out audio interface:

  • Direct recording with amp tone and effects
  • Re-amping possible (sending tracks into the amp)
  • Very low latency for monitoring
  • USB power possible (though better with the adapter)

Perfect for a home studio, recording demos or working in a DAW.

Battery operation: ultimate freedom

The THR30II can run on 8 AA batteries with up to 8 hours of runtime. That is fantastic for:

  • Playing in the garden
  • Impromptu outdoor sessions
  • Travel with no mains access
  • Amplified acoustic busking

Sound quality on batteries is identical to mains operation. No compromise.

Versatility: a genuine Swiss army knife

Electric guitar

★★★★★ — This is its home ground; it excels.

Acoustic guitar

★★★★☆ — Very good with the ACO channel; add a DI and it is perfect.

Bass

★★★★☆ — The BASS channel is genuinely usable, with excellent definition.

Monitoring/playback

★★★★★ — The stereo speakers make it an excellent monitor for production work.

Rehearsal amp

★★★☆☆ — Sufficient for an acoustic duo, but limited with a drummer.

Points to watch

The price

At €599, it is an investment. For comparison:

  • Boss Katana 50 MkII: €250 (50 W, very good but less refined)
  • Positive Grid Spark: €300 (good tone, excellent app, less premium)
  • Fender Tone Master Mini: €200 (compact, good tone, fewer features)

The THR30II is clearly more expensive, but offers:

  • Better sound quality
  • A built-in wireless system (€120 of value)
  • Premium construction
  • True stereo

Power limits

2 × 15 W is enough for:

  • ✅ Personal practice
  • ✅ Home studio
  • ✅ Small acoustic jams
  • ✅ Desk and living room

But insufficient for:

  • ❌ Rehearsals with an acoustic drummer
  • ❌ Small stages (take a 50 W+ amp instead)
  • ❌ High volumes

Dependence on the app

To exploit the amp fully (access to the 40 amp models, the complete effects chain), the app is essential. The physical controls alone are limited.

Final verdict

Who is it for?

Perfect for:

  • Guitarists working at home
  • Home studio and recording
  • Quality daily practice
  • Multi-instrumentalists (guitar, bass, acoustic)
  • Frequent travellers
  • Lovers of technology and wireless freedom

Less suited to:

  • Tight budgets (a Katana or Spark suits better)
  • Anyone needing serious power (stage, rehearsals)
  • Guitarists who prefer pure analogue
  • Anyone who dislikes depending on an app

Our final verdict

The Yamaha THR30II Wireless is an engineering masterpiece for its segment. It combines:

  • Very high-level sound quality
  • Flawless wireless technology
  • Premium design and construction
  • Exceptional versatility
  • Complete features

Is it the best desktop amp on the market? For us, yes, if the budget allows. No other amp in this category offers this level of refinement, features and sound quality.

The wireless system alone changes the experience of playing at home. Combined with excellent tones, a complete app and sublime design, the THR30II justifies its premium price.

If you are looking for the ultimate desktop and home studio amp and €599 is within your budget, it is a purchase without regrets. You will have a daily musical companion that makes you smile at every session.

Final score: 9/10

The most accomplished desktop amp on the market. A high price, but entirely justified by the performance and the features.

Tested over 2 months in daily use (home studio, practice, recording). Guitars tested: Fender Telecaster, Gibson Les Paul, Ibanez RG, Yamaha acoustic. App tested on an iPad Pro and a MacBook Pro. Comparisons made with a Boss Katana 50 MkII, a Positive Grid Spark and a Fender Blues Junior.