Phil Jones Bass D-400 Compact Bass Amp Head

The D-400 Compact Bass Amp Head delivers 350 watts of power in a high-fidelity, ultra-lightweight design, offering professional performance for studio, stage, and rehearsal use. Combining hybrid analog tone shaping with modern Class D efficiency, this amp is powerful, quiet, and built to last — all while fitting neatly into a 1U rack-mountable chassis.

Housed in aircraft-grade anodized aluminum, the D-400 runs completely silent thanks to a fanless cooling system, ensuring noise-free operation even in critical recording environments. Despite its compact size, it provides exceptional tonal control through a 5-band EQ section (Lo-Bass, Hi-Bass, Lo-Mid, Hi-Mid, and Treble) along with onboard compressor and limiter circuits for precise dynamic management.

The rear panel offers comprehensive connectivity, including DI out, FX send/return, preamp out, headphone out, and speaker output, along with EQ pre/post switching and ground lift for seamless integration into any professional rig.

Whether you’re chasing studio-grade clarity, live power, or portable reliability, the D-400 delivers it all in one sleek, minimal footprint.

Specifications:

• Model: D-400

• Power Output (RMS): 350W @ 4Ω / 200W @ 8Ω

• Amplifier Type: Hybrid, Class D (fanless design)

• EQ: 5-Band Graphic EQ (Lo-Bass, Hi-Bass, Lo-Mid, Hi-Mid, Treble)

• Controls: Input Level, Limiter Level, Master Volume

• Switches: Mute/Low/High, Limiter On/Off, EQ Pre/Post, Ground Lift

• Inputs: 1 x ¼” instrument input

• Outputs: Speaker Out, DI Out, Preamp Out, Headphone Out

• Effects Loop: Send/Return jacks

• Compressor/Limiter: Selectable with indicator LEDs

• Construction: Precision aircraft-grade black anodized aluminum

• Dimensions: 9.6" W × 7.6" D × 1.7" H (244 × 193 × 43 mm)

• Weight: 2.9 lbs / 1.3 kg

• Power: 100–240V AC universal input

• Accessories: Optional padded gig bag (sold separately)

Quiet, cool-running, and sonically powerful, the D-400 Compact Bass Amp Head is a professional-grade solution for players who need tone, reliability, and portability in one precision-engineered package.