Back in the day... Panasonic started making BBD chips. They started with the 30 series, which are high headroom (15v) devices. They then transitioned to the 32 series, which are 9v devices, so less headroom (distort more easily) but slightly lower noise. Coolaudio and another Chinese company started to copy the 32 series a long time ago, and there's generally not thought to be a huge difference in sound between the MN3205 and the CA3205. XVIVE then started to make the MN3005, to great rejoicing. There has been some benchmarking and it appears there may be the tiniest little increase in noise with the chinese chips. It also seems like the Xvive delay, despite being designed by Howard Davis, just didn't measure up to a DMM.