In the Audio buying guide from 1997, the Phase Tech 3.5T lists for $260 pr. It is equipped with a 6.5 inch woofer and a soft dome tweeter. Crossover is 3 kHz. Frequency respomse is a claimed 50 Hz to the usual 20 kHz. Sensitivity is 90dB, and impedance is 8 ohms.
I've never heard the 3.5, but I did listen to the 9T. I thought the sound quality was darned good, but not as good as the PC line from Phase Tech.