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K&K Double Helix Upgrade System, in addition to the Pure Pickup, comes with one K&K Double Helix soundhole pickup, hum-cancelling dual-coil pickup for steel-string acoustic guitars, it features a phase switch and a unique tone switch that allows players to easily change from a bright GLOSS setting to a more substantial STEAM setting, K&K Dual Channel Pro Preamp ST preamp, compatible with both piezo and magnetic pickups, one stereo input, two outputs, a main/mix out and an individual channel output, internal 3-band EQ for both channels, 2 x volume control, frequency range 10 - 30,000 Hz, input Impedance: 1 Mega Ohm, output Impedance: 3 K Ohm, average current: 3.5 mA.
K&K Double Helix Upgrade System leveres, udover Pure Pickup'en, med én K&K Double Helix lydhulspickup, en hum-cancelling dual-coil pickup til stålstrengede akustiske guitarer. Den har en fasekontakt og en unik tonekontakt, der gør det nemt for spillere at skifte fra en lys GLOSS-indstilling til en mere subtil STEAM-indstilling. K&K Dual Channel Pro Preamp ST forforstærker, kompatibel med både piezo- og magnetiske pickups, en stereoindgang, to udgange, en main/mix-udgang og en individuel kanaludgang, intern 3-bånds EQ til begge kanaler, 2 x volumenkontrol, frekvensområde 10 - 30.000 Hz, indgangsimpedans: 1 Mega Ohm, udgangsimpedans: 3 K Ohm, gennemsnitlig strøm: 3,5 mA.
