Using the standard 4× upsampling filter from BS.1770, one can’t get more than +6.2 dB of true peak overshoot, even on RBJ’s signal. However the standard does not prescribe the single correct way to measure true peaks, so different meters may apply various amounts of oversampling. For example, RX would show +7.4 dBTP on the same signal, as it exceeds the minimal 4× upsampling requirement.
