KEF R700: "The impedance traces reveal none of the small wrinkles that would point to the presence of panel resonances, and the R700's large enclosure was quite dead to the knuckle-rap test. Investigating the panel's vibrational behavior with an accelerometer did uncover a mode at 488Hz on the sidewalls level with the lower woofer (fig.2); also present was a mode slightly lower in frequency, at 449Hz, on the top panel and the sidewalls level with the coincident Uni-Q unit. However, all of these resonant modes are relatively low in level; this, coupled with their high frequency and Quality factor (Q), will minimize any audible effects
SILVER : "A significant discontinuity just below 300Hz in the impedance traces suggests some sort of cabinet-resonance problem at that frequency. I did find a strong resonant mode at 301Hz on the top and rear panels (fig.2), and another strong mode at 410Hz on the side panels, level with the midrange unit. Lower, and level with the woofers, the side panels were relatively inert; as Kalman Rubinson commented that "male voices . . . didn't sound overripe," it's probable that these resonances measure worse than they sound."
John A. Stereophile
who do i talk to around here about changing my title from "advanced member" to "specialED member"