Check the listing for details. Synergy Powerball 2-channel Preamp Module. Condition: New. Listed at 399.99 USD. ENGL’s Powerball in a Synergy Preamp Module In the world of electric guitar amplifiers, ENGL is synonymous with killer high-gain tones. The Synergy Powerball packs channels three and four of one of ENGL’s best-loved amp heads into a high-octane preamp module. Designed in cooperation with Horst Langer of ENGL Amplification, the Powerball module yields a super-thick saturated tone, plus a healthy dose of punch that can go toe-to-toe with the head that inspired it. This all-tube module includes dual Gain and Volume knobs for flexible gain-staging, plus dual 3-band EQs for sculpting your tone to perfection. Dual Gain Lo/Hi switches toggle between crunchy overdrive and full-on distortion, while dual Mid Boost switches enable you to fine-tune the module’s sonic character.