Ashdown Bass Magnifier UK-ABM-600-EVO IV 600W Bass Amp Head - Ice Blue

When your rig needs to hit harder, cut clearer and stay in control at volume, the Guitar Center Exclusive Ashdown Bass Magnifier UK-ABM-600-EVO IV amp head delivers. Handcrafted in the UK, Ashdown’s flagship 600W head pairs a high-headroom power section with a 12AX7 tube-driven preamp for a sophisticated, harmonically rich response. Its upgraded Variable Valve Drive Plus circuit pushes the tube with increased current, unlocking a seamless transition from vintage-inspired warmth to aggressive, saturated overdrive. A nine-band EQ gives you precise control over every part of your sound, while the Sub-Harmonic Generator adds weight and depth beneath your fundamental notes. The One Knob Compressor keeps dynamics in check without flattening your feel, and the signature VU meter helps you dial in optimal input levels. With footswitchable control and comprehensive stage and studio connectivity, this 600W bass amp head provides a powerful platform for shaping and delivering serious bass tone.

600W Power Section With Tube-Driven Preamp for Authority, Depth and Response

The UK-ABM-600-EVO IV combines a 600W power section with a 12AX7-driven preamp, delivering the headroom and responsiveness needed for demanding performance environments. Its output remains tight and controlled at volume, preserving low-end weight and midrange clarity while allowing the nuances of your playing to come through. The tube stage introduces natural compression and harmonic detail, adding dimension and feel that responds dynamically to your touch. The result is a powerful, articulate foundation that maintains definition whether you’re playing clean, pushing the front end or sitting deep in the mix.

Variable Valve Drive Plus for Expanded Gain Range and Harmonic Control

At the heart of the UK-ABM-600-EVO IV is Ashdown’s upgraded Variable Valve Drive Plus circuit, which feeds increased current to the 12AX7 tube for a broader, more responsive gain range. This allows you to move seamlessly from clean tones with subtle warmth to full, saturated bass overdrive with enhanced harmonic content. The drive can be engaged and controlled via footswitch, making it easy to switch between tonal textures in real time. Whether adding edge to a clean tone or pushing into more aggressive territory, the circuit remains controlled and musical across its range.

9-Band EQ, Sub-Harmonic Generator and Compression for Detailed Tone Shaping

A comprehensive nine-band EQ provides precise control over your frequency spectrum, allowing you to shape your tone with accuracy across lows, mids and highs. The Sub-Harmonic Generator adds a controllable octave-below layer, reinforcing low-end depth without overwhelming the mix. A one-knob compressor smooths dynamics and evens out your playing, helping maintain consistency across different techniques. Together, these tools offer a high level of tonal control, making it easy to dial in everything from tight, focused sounds to deeper, more expansive voices.

Footswitchable Control, VU Meter and Pro-Level Connectivity for Stage and Studio Use

Built for professional applications, the UK-ABM-600-EVO IV includes comprehensive connectivity and performance-focused controls. A balanced DI output supports direct integration into front-of-house and recording setups, while an FX loop allows seamless use of external pedals and processors. Additional connections such as tuner out and line input expand its versatility across different rigs. Footswitchable control over key functions enables dynamic performance adjustments, and the signature Ashdown VU meter provides real-time feedback for setting optimal input levels. Together, these features provide flexible control and connectivity for stage and studio setups.

A Flagship Bass Head With Powerful Tone-Shaping Control

Handcrafted in the UK, the Bass Magnifier UK-ABM-600-EVO IV combines high-output power, tube-driven character and comprehensive tone shaping in a robust amplifier designed for stage and studio use. Its thoughtful layout keeps operation intuitive despite its depth of control, while the 600W power section, Variable Valve Drive Plus circuit and extensive performance features give bassists a flexible platform for shaping their sound. Available as a Guitar Center Exclusive, the UK-ABM-600-EVO IV brings Ashdown’s flagship Bass Magnifier design to players seeking authoritative bass tone and hands-on control.

Ashdown Amplification Arrives at Guitar Center

Since 1997, Ashdown has built its reputation on powerful, road-ready amplification trusted by bassists on stages around the world. From its iconic Bass Magnifier amps and bass cabinets to pedals, guitar amplification and artist-driven designs, the family-run company has remained dedicated to giving players distinctive tone and dependable performance while renewing its commitment to UK-built craftsmanship. Guitar Center is proud to partner with Ashdown, bringing the brand’s celebrated amplification legacy to musicians nationwide.