A4 is coming close to a mass production. But the detaching cable part is still a headache for LZ.
Some weeks ago, LZ said the sound quality of A4 prototype is unacceptably bad (after reading you guys' feedbacks, I guess...).
I've found that one pair of the prototype is defected. This may have affected some of your impressions.
Anyway, the sound of A4 will be very different, according to LZ.