The A3 Stompbox UP Bass Preamp w/ Frequency Control is a compact bass preamp pedal designed to give bass players simple, musical control over their core tone. Whether you are running into an amp, recording setup, or another pedal, it helps shape your bass signal with a natural and responsive feel.

At the centre of the pedal is the Frequency control, allowing you to choose the key EQ area you want to shape. Move into the lower range for extra body and weight, or push into the midrange to bring out more presence, definition and attack.

The Cut / Boost control works together with the Frequency knob, letting you reduce or enhance the selected frequency range. This makes the pedal useful for subtle tone correction, adding punch to a mix, or pushing your bass tone forward without making it feel harsh or unnatural.

The Input control lets you match the pedal to different basses and pickup outputs. It works well with both passive and active basses, and the 9–12V DC input gives you the option of running at 12V for increased headroom.

With its simple layout, vintage-style amber LED and practical tone-shaping controls, the A3 Stompbox UP Bass Preamp is a useful always-on tone tool for players who want more control over their bass sound without overcomplicating the signal chain.

Features:

• Bass preamp pedal with frequency-based tone shaping
• Suitable for passive and active bass guitars
• Frequency control selects the EQ centre point
• Cut / Boost control reduces or enhances the selected frequency range
• Input control helps match different pickup outputs
• Output sends the processed signal to an amp, recording setup, or next pedal
• DC 9-12V centre-negative power input
• 12V operation provides wider headroom
• Vintage amp-style amber LED indicator
• Footswitch for effect on/off control
• Size: 10 W x 15 D x 6 H (cm) / Weight: 550g