The pre-amp circuitry in each EMG pickup is factory preset for the optimum output level. This level was carefully determined to minimize hum and noise while maximizing a clean output signal under heavy playing and high transients, and can't be modified. Please note that a clean, high output level from the pickup into a high-gain amplifier is the BEST way to get a full, distorted tone!
If you would like to have increased output from the guitar, you can add our EMG-PA2 inline pre-amp booster which includes a trimpot that lets you adjust the output level up to +20dB(!).
EMG active pickups have higher output levels than traditional passive pickups. If you find that the output level of your EMG pickup is too hot to get clean tones, the easiest fix is to reduce the gain on your amp (if it has pre-amp/master volume controls). If that doesn't do the trick, then try turning down the volume control on your guitar. Unlike a traditional passive volume/tone system, the low-impedance EMG system lets you turn down the volume with very little effect on the tone, so you won't sound muffled when you back off the volume knob. If this is still a problem, contact EMG tech support at the email address listed above for more info on circuit mods to address your problem.