Preamp out stereo

[Axel]

Thank you, I have the same expect from that I use low pass filter.. Can that be the reason?

If you have the preamp outs on your 220 configured as in the attached screenshots, they should be active every time the amp is switched on. 


Welcome to the forum BTW! 😀

I don’t know for sure, but I don’t think using a low pass filter will affect the functionality of the pre outs.