Xiaomi Xiaoai Speaker HD bluetooth audio delay

[ZDKDSGN]

Hi all Mi fans,

I bought this awesome device, sound is great, but if I start streaming sound from windows pc, iPad, iPhone, Redmi phone, the sound has delay.
It is about -450ms.

I tried make factory reset, turn on/off bluetooth, but no success.

Has anybody knows where is the problem?
Other bluetooth audio devices like headphones and harman/kardon bluetooth speaker has audio without delay.

Thanks for your replies
ZDK