Avantone Pro GTR-100 Preamp/Rack Amplifier

Class A/B Power Amplifier for the Modeler Era

The Avantone Pro GTR-100 is a 100W, 2-channel Class A/B power amplifier engineered for guitarists who build their sound inside a modeller such as the Fractal Audio Axe-FX or Neural DSP Quad Cortex. Where traditional power amps add their own voice to the signal, this solid-state design stays out of the way, reproducing the modeller's output with high headroom and minimal coloration. At 100W per channel into 8Ω, 140W per channel into 4Ω, and 245W in bridged mono, it drives a 4x12 cabinet on a club stage without strain.

Switchable Line and Instrument inputs on each channel match impedance to the source, so a modeller's balanced line output and a stompbox's instrument-level output both feed the power stage cleanly.

Built Around the Modern Modeller Workflow

What separates this model from a generic stereo power amp is its focus on the specific needs of a modeller-based rig. The per-channel analog cabinet simulation on the XLR Thru outputs emulates the sound of a miked 4x12 cabinet, sending a fully mixed, cab-simulated signal directly to the front-of-house console or recording interface without a microphone on a speaker cabinet. A switchable 4-band EQ provides last-mile tone shaping to compensate for room acoustics.

Power Ratings That Match Real-World Cabs

The power stage is rated at three useful operating points, allowing the amp to be matched to common cabinet configurations.

• Stereo Power at 8 Ω: 100 W per channel — standard rating for most 4x12 and 2x12 guitar cabinets
• Stereo Power at 4 Ω: 140 W per channel
• Bridged Mono at 8 Ω: 245 W — combines both channels into a single high-output feed for situations where maximum SPL is needed from one cabinet

Clean Amplification With Modeler-Grade Transparency

Engineered to add as little noise and distortion as possible, the signal path lets the modeller's output reach the speakers unchanged. A damping factor of 275 at 100 Hz into 8 Ω keeps the amplifier's control over the speaker cone tight, which translates into defined low-end response and accurate note articulation.

• Total Harmonic Distortion: <0.1% at 1 kHz
• Signal-to-Noise Ratio: >101 dB (A-weighted) — quiet enough for high-gain and ambient patches without hiss
• Frequency Response: 20 Hz–20 kHz, ±0.25 dB — full-range response covering the entire guitar spectrum
• Input Impedance (Instrument, Hi-Z): 1 MΩ — preserves the high-frequency content of passive guitar pickups when feeding stompboxes directly

Road-Ready 1U Chassis With Practical Connectivity

The 1U rack chassis fits alongside a modeller, wireless receiver, and power conditioner in a standard 3U or 4U rack case. Rear-mounted rack rails and protective metal handles that extend past the control knobs pay off during load-in and load-out.

• Chassis Dimensions: 483 mm W × 44 mm H × 386 mm D — standard 1U rack format
• Weight: 7.7 kg
• XLR Thru Outputs with switchable analog cabinet simulation — direct feed to FOH or recording interface without placing a microphone on a cabinet
• Cooling: whisper-quiet fan with protect indicator — sustained operation without thermal shutdown during long sets

For Modeller-Based Rigs, Touring Guitarists, and Dual-Guitar Setups

The Avantone Pro GTR-100 is the right choice for guitarists running a modeller-based rig who need a clean, transparent power stage to take their tones from studio to stage without losing patch character. Players using an Axe-FX, Quad Cortex, Helix, or similar processor benefit from the matched Line input impedance, the per-channel analog cabinet simulation, and the switchable 4-band EQ for room compensation.

Touring guitarists will appreciate the 7.7 kg solid-state chassis as a lighter, maintenance-free alternative to a tube power amp, while bands with two guitarists can run each channel independently, splitting one amplifier between two players.