German Physiks PQS-402 loudspeakers in a customer’s system in China partnered with YBA mono power amplifiers, YBA CDT-450 CD transport, MBL Germany 1611A D/A converter, MBL 6010D pre amplifier Pro-Ject Audio Systems RPM-10 turntable, Melco Audio N1A-EX network player and Ensemble Fonobrio phono amplifier. The two omnidirectional DDD drivers on front of the PQS-402 cover the range from 215Hz to 24,000Hz. The bass system uses two 10-inch woofers and four 8-inch passive radiators to take the response down to 24Hz.