Yes, the third was audible, then gone.
The little JBL LSR 308 has audible distortion on a sweep at moderately high levels.
Sweep levels and third harmonic relative to fundamental of JBL vs MartinLogan at about 92dB SPL
The JBLs are my economy Daily Drivers, and the Krell/MartinLogans are for attentive listening and general headbanging when desired.
