Grade-2 PRIME are not offered and only used within Zu loudspeaker systems.
Grade-2 are not offered and only used within Zu loudspeaker systems. Representing ≈ 20% of all matched sets. Pairs receiving this grade have nearly identical tone prints and dynamic behavior. Average nominal SPL difference between pair is zero.
Grade-1 Representing ≈ 35% of all matched sets. Above average matching having nearly identical tone prints and dynamic behavior but allow for a few subtle divergence. Average nominal SPL difference between pair is 1/8dB.
Standard Grade Representing ≈ 40% of all matched sets. "Standard" is still a pretty tightly matched pair but allows for a few points of divergence within the tone print matching process. Average nominal SPL difference between pairs is a very low 1/4dB.
Radian 850 Standard Grade Matching—Differential Comparison. Measured at 110dB-SPL