For an extended low-frequency response and a bit more muscle step up to the Eris E8. With its 8-inch Kevlar low-frequency transducer driven by a 75 watt Class AB power amplifier it can range down to 35 Hz. Like the E5 the E8 can reach all the way to 22 kHz thanks to a 1.25-inch (32 mm) silk-dome high-frequency tweeter. However the E8's tweeter is driven by a heftier 65W Class AB amplifier. With its extra juice the E8 can deliver up to 105 dB SPL peak. All Eris speakers have front-ported enclosures made of vinyl-laminated medium-density fiberboard (MDF).