The 'house sound' is alive and well throughout the line.
The Signature and Statements employ the same drivers as the standards, with the crossovers being the change, as well as being stuffed with natural wool instead of inexpensive poly/synthetic stuff--a sort of no holds barred....so they sound alike, just less textured and dynamic...not so small changes in musical satisfaction.
To me, if a loudspeaker DOES NOT have a house sound, meaning in this context the same overal timbre and tonal balance, the designer isn't doing his/her job--or doesn't have a firm opinion of what things sound like--well not a consistant one.
The hallmark, to me of quality goods is this, the manufacturer/designer is saying, 'This is what we think a trumpet/sax/singer sounds like...'
Then they offer you another product, costing more which fleshes out more information but doesn't change its overall sonic character.