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K&K Pure Preamp 

The K&K Pure Preamp is time-tested external preamp, featuring +/-20 db bass and mid EQ -, and +/- 16 dB treble EQ controls plus an internal gain trimmer that allows you to adjust the gain from factor 0.5 (half as loud as input signal) to factor 10 (10 times as loud as input signal). This belt clip unit has been specifically designed for the frequencies of the acoustic guitar but it is also great choice for many other acoustic instruments. The Pure Preamp features a special super wide band midrange filter, which is absolutely amazing in combination with the Pure pickups. It is simple and noiseless circuitry provides unsurpassed clarity and power and the internal gain trimmer allows you to dial in the precise amplification factor needed for your instrument. Frequency response is 10-30.000Hz. The bass control is set to roll off at 100Hz, the midrange at 1.5kHz with extra large bandwidth and the treble are set at 10kHz. Input impedance is 1 meg and the output is low ohmic. Battery life is about 180+ hours. On the rear of preamp are two 1/4" jacks (input and output). The output jack also doubles as battery switch, when unplugged it disconnects the battery when not in use.