Yamaha PX10 Power Amplifier 100319229 the answer is

the answer is

transformer based

Our patented stepped yoke holds both acoustic and electric guitars as well as desktop mixers and combo amps in the front and an additional electric guitar in the back

Minimum Impedance: 7

High-Mid/High: 450Hz to 9

Yamaha PX10 Power Amplifier 100319229 the answer isYamaha PX10 Power Amplifier The versatile PX10 power amplifier combines intelligent processing with high output power to meet the requirements of a vast range of sound reinforcement environments. Since the 1976 release of the P2200, Yamaha's first professional power amplifier, Yamaha has strived to achieve the highest possible levels of sound quality, power output, and reliability in sound reinforcement, studio, and installed applications. The new PX