iD55 surely owes more than a small debt of conceptual gratitude to JBL’s 2005 model On Tour, which pioneered the concept of an arcing portable speaker with a slide-open protective cover. JBL’s design was beautiful for its time, marrying iPod-matching glossy white plastic with silver and gray accents, as well as twin speaker drivers that pointed upwards and forward, but it notably lacked any sort of device charging capabilities and ran…