Upgrade your acoustic guitar with the versatile Belcat SB4TN Onboard Preamp System, designed to deliver clear amplified tone, precise tone shaping, and convenient onboard tuning. This all-in-one system includes a 4-band equaliser, built-in digital tuner with LCD display, and an active bridge piezo pickup—making it an ideal solution for performers, DIY builders, and guitar repair technicians.

With independent sliders for Presence, Treble, Middle, and Bass, you can easily shape your acoustic tone to suit different playing styles and venues. The integrated digital tuner ensures quick and accurate tuning directly from your guitar, while dual outputs (6.35mm and balanced XLR) provide flexible connection options for amplifiers, mixers, or PA systems.

Perfect for upgrading or installing into most acoustic guitars, the SB4TN provides reliable performance with professional connectivity and a clean onboard design.

Features

• 4-Band EQ Tone Control – Presence, Treble, Middle, and Bass sliders for precise sound shaping
• Built-in Digital Tuner – Clear LCD display for quick and accurate tuning
• Active Bridge Piezo Pickup – Captures detailed acoustic vibrations for natural amplified tone
• Volume Control Knob – Easily adjust output level while playing
• Dual Output Options –
• 6.35mm (Hi-Z) output for guitar amplifiers
• 3-Pin XLR (Low-Z balanced) output for mixers and PA systems
• Low Battery LED Indicator – Lets you know when it’s time to replace the battery
• Internal 2.5mm Input Jack for piezo pickup connection
• Powered by 9V battery (not included)

Specifications

Brand: Belcat
Model: SB4TN
Instrument Compatibility: Acoustic Guitar

Controls

• 4-Band EQ: Presence / Treble / Middle / Bass (slider controls)
• Volume: 1 x rotary knob
• Tuner: Digital processing tuner with LCD display

Pickup

• Active bridge piezo pickup
• Connector: 2.5mm internal jack

Outputs

• 6.35mm Jack (High Impedence)
• 3-Pin XLR Balanced Output (Low Impedence)

Power

• 9V Battery (not included)
• LED low battery indicator

Dimensions

Measurements listed are approximate and for reference only.

Equaliser Module

• Cutout Requirement: 85mm (L) × 49mm (W)
• Depth: 30–40mm
• External Size: 97mm (L) × 59mm (W) × 5mm (H)
• Battery Cable Length: ~55cm

Battery Pack

• Cutout Requirement: 52mm (L) × 40mm (W)
• Depth: 53mm
• External Size: 65mm (L) × 49mm (W) × 5mm (H)

Piezo Pickup

• Size: 70mm (L) × 3mm (W) × 2.8mm (D)
• Cable Length: ~35cm

Package Includes

• 1 × Belcat SB4TN Onboard Preamp System
• 1 × Bridge Piezo Pickup
• 8 × Black Mounting Screws
• 1 × Cable Tidy