No more than 150 for a portable. I have and love the m80, but don't consider it portable.I prefer mildly boosted bass below 100hz, and a smooth, slightly polite high-end. I listen to rock, pop, country, bluegrass, big band and standards, some classical, and orchestral pop. I host a syndicated 70s show, so mids must be smooth. My voice must sound like me. Thanks for your response!