- Positiv Grid Spark, modelling combo amplifier for electric/acoustic guitar and electric bass, Spark 40 Smart Guitar Amplifier & App. Packed with 40 Watts of immersive, room-filling sound, ultimate on-board control and massively inspiring smart features like the all new Smart Jam Live, Auto Chords, 50,000+ tones and more!, channels: 1, power: 40 watts, equipped with: 2 x 4" (10,2 cm) speakers, cabinet construction: ported, frequency range: 20-20,000 Hz, controls: Amp Type, Gain, Bass, Mid, Treble, Master, Mod, Delay, Reverb, Output Volume, Music Volume, switches: 4 Programmable Preset, Tap/Tuner, effects: 43 onboard (erweiterbar über Spark App), connections: Input (1/4" jack), Phones/Rec Out (Stereo 3,5 mm Jack), Aux In (Stereo 3,5 mm Jack), USB connector, PSU Input, special features:, Smart Jam (AI generated backing tracks), Auto Chords (shows the chords for each Youtube video), Amp and Effect Library with more than 50,000 tones (grows daily), dimensions (W x D x H): 350 x 180 x 190 mm, (10.82" x 19.6" x 11.14"), weight: 5.2 kg (15.7 lbs), included: PSU, USB Cable, colour: Black