Guitar Amp + Karaoke & PA Speaker

Justus Gadgets Portable Battery‑Powered Guitar Amp, Karaoke & PA Speaker

Backed by our 1 Year Guarantee: we stand behind every product we build. If any part fails under normal use within the first year, we’ll repair or replace it free of charge. After that, Justus Gadgets remains here to help with parts or technical support whenever you need it.

Designed and built entirely in‑house, this self‑contained system combines pro‑level DSP vocal and guitar processing, versatile playback options, and deep, room‑filling sound—all powered by an internal rechargeable battery in a rugged, custom gray enclosure.

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At the heart of our custom enclosure lies a high‑performance digital signal processor (DSP) amplifier board that transforms any space into a mobile karaoke stage or guitar performance rig. Whether you’re streaming a playlist via Bluetooth, playing tracks from a USB drive, singing live into dual microphones, or plugging in your guitar, the DSP ensures your voice and instrument cut through music with clarity.

• Lifetime Support & 1 Year Guarantee
  • Covered for all defects and parts issues under normal use for 1 year—no hassle, no extra cost.
  • After the first year, our team remains available for troubleshooting help, replacement parts, or firmware updates.
• Vocal Cancel
  • Engage “Vocal Cancel” to attenuate center‑panned lead vocals on any stereo track—perform live over backing music without re‑mixing files.
  • Adjustable cancel level preserves instrumental balance while removing most vocal content.
• Mic Priority (Automatic Ducking)
  • Activate “Mic Priority” so background music smoothly fades down whenever a mic signal is present. Music returns to full volume the moment you stop—no manual volume juggling.
• Parametric Microphone EQ & Effects
  • Mic Bass & Mic Treble Controls: Precisely shape low and high frequencies before amplification for crisp, clear vocals.
  • Echo & Delay Knobs: Independently adjust echo depth (“wetness”) and echo time to achieve anything from tight slapback to spacious reverb.
  • Three Preset DSP Modes:
    1. Professional Mode: Concert‑hall reverb optimized for live singing—warm, natural ambience without harsh overtones.
    2. Conference Mode: Light “room” effect tailored for spoken word, announcements, and presentations.
    3. KTV Mode: Signature karaoke “KTV” reverb that adds presence and air to vocals.
• Dedicated Music EQ
  • Music Bass & Music Treble Controls: Sculpt the low and high frequencies of your backing tracks in real time—no menu diving.
  • Music Volume Control: Master volume for Bluetooth, USB, microSD/TF, or 3.5 mm aux playback sources.

• • Integrated Guitar Amp
  • Dedicated Instrument Input: A ¼″ “GTR IN” jack lets you plug any electric guitar, acoustic‑electric, or keyboard directly into the DSP amplifier.
  • Guitar Volume & Tone Control: Independent Guitar Volume Knob mixes instrument level with background music or mic audio. Use Mic Bass & Mic Treble Controls to shape guitar tone—no extra pedals needed.
  • • Guitar‑Focused DSP Effects: Apply Echo & Delay to your guitar signal, creating lush ambience or tight slapback. Choose any of the Three DSP Modes (Professional, Conference, KTV) for on‑demand reverb on guitar.

• Connectivity & Playback
  • Bluetooth 5.0 A2DP Receiver: Pair smartphones, tablets, or laptops instantly. DSP automatically optimizes playback for clarity.
  • USB A & Micro SD/TF Card Slots: Play MP3, WAV, or FLAC files directly from a thumb drive or card (up to 32 GB). Built‑in Prev/Play/Next and Repeat buttons let you navigate without an external controller.
  • 3.5 mm AUX Input: Connect any line‑level source—laptop, mixer, or smartphone—and let the DSP apply EQ and vocal effects.
  • Line‑Out RCA Jacks: Send DSP‑processed audio (EQ + vocals) to a second amplifier, powered subwoofer, or recording device. Link multiple units for larger events or record live performances.
• Speaker & Enclosure Highlights
  • Front & Rear Sony 3″ Full‑Range Drivers (×4): Two on the front baffle, two on the rear baffle for 360° mid/high coverage. Each driver is horn‑loaded through a custom, heat‑resistant PETG port precisely printed to match the Sony driver’s throat diameter and flare geometry.
  • 6.5″ Sealed Subwoofer (Front Lower Baffle): Housed in its own sealed chamber and protected by a branded “JG” PETG grill. Delivers tight mid‑bass that complements vocals and guitar clarity.
  • 10″ Sealed Subwoofer (Internal, Bottom‑Mounted): Installed in a sealed, braced compartment—no porting—providing tight, accurate deep bass extension down to 35 Hz.
  • Custom 3D‑Printed PETG Components:
    • Heat‑Resistant PETG Grills: Four square grills (one per 3″ full‑range driver) and one circular “JG” grill (6.5″ subwoofer).
    • PETG Ports: Only on the full‑range drivers, precisely tuned for optimal dispersion.
    • Ergonomic PETG Handle: Bolts over the DSP panel for balanced, one‑handed carrying—built for durability under heavy use.
  • Rugged, Matte Gray Finish: Two coats of gray acrylic enamel on all external faces resist scratches and scuffs—ready for transport and outdoor events. Four rubber feet keep the unit stable on any surface—tables, grass, or pavement.

• Battery & Power
• Internal 12 V Sealed Lead‑Acid Battery (~7 Ah): Provides several hours of continuous performance at typical volumes—ideal for backyard parties, busking, or mobile DJ setups.
• On‑Board 12 V DC Toggle Switch & Charging Jack: Easily power on/off and recharge with any 12 V SLA charger (sold separately). No AC outlet needed at your event.
• • AC Charging via Amp Board: When you plug in the provided AC power cord, the DSP amp board automatically charges the internal battery while simultaneously powering the speaker.

Why Buy From Justus Gadgets?

1. 1 Year Guarantee & Lifetime Support
   • All products carry a 1 year guarantee covering defects and parts failure under normal use—no questions asked.
   • After one year, we’re still here to provide replacement parts, troubleshooting guidance, or firmware updates—just reach out.
2. Industry‑Leading DSP for Vocals & Guitar
   • Premium vocal processing: Vocal Cancel, Ducking, Parametric EQ, Echo/Delay, and three one‑touch ambience presets.
   • Integrated guitar amp: dedicated input, volume/tone, and DSP effects—no extra pedals needed.
3. True Battery‑Powered Freedom
   • Internal battery means no extension cords—set up on patios, campsites, or sidewalks without missing a beat.
4. Custom‑Designed Heat‑Resistant PETG Hardware
   • Every grill, port, and handle is printed in PETG for long‑term durability under high temperatures and repeated handling.
5. 360° Sound Coverage & Sealed‑Sub Bass
   • Quad full‑range drivers (horn‑loaded) plus two sealed subwoofers deliver clear mids/highs all around and tight lows down to 35 Hz.