So what speaker meets your criteria and how much does it cost? The old AR9's do a pretty good job and you can find them used for $400 to $1000, depending on condition. My pair which is like new, cost me $735 and a 180 mile round trip. Their frequency range is given to be 18hz to 30khz and .5 distortion. There are some newer speakers that may do this better but look at the cost. I'd love to hear Dunlaveys, the big Legacys and some others but they cost more than I'd probably ever spend and I am very pleased with what the old AR9's do. Since biamping them, they have come to life, can play very loud without distortion and certainly have deep bass. There are ways to tweak them and make them even better but I don't feel the need yet, maybe sometime. At their cost, I consider them to be a true bargain when compared to new or even other used speakers. I don't think you could come close to what they'll do if you built your own with new components without spending more money and of course, you'd have to build them. I'm afraid mine would not look so pretty.
Bill