I suspect that somewhere along the way, JBL accidentally mixed up their plate amp photos. I do not believe the 550p has speaker level inputs. If you look at the Amazon listing, you will see the speaker level inputs. Currently there are eight 5-star reviews and two 2-star (or 1-star?) reviews. The 2 "negative" reviews are by people who bought this sub with the expectation\/need for speaker level inputs!\n\nLike you, I am disappointed that JBL didn't "grab the bull by the horns" and start producing high performance subwoofers. However, my expectations for a 10" sealed sub are a good woofer to fill out the low frequencies for music, and that falls squarely within JBL's competencies! Anyone looking for LFE should look elsewhere.\nJBL does make high performance subs, designed for cinema use. They're relatively inexpensive, but require amplification and a big enough listening area to appreciate them. They're not very attractive either so might not appeal to many. They also have a sub in their Synthesis line. I still think JBL would be smart to reintroduce the B-380 again.