s950 high resonance peaks, faulty unit?

I get some high frequency "spikes" on my S950. It happens when I set the low pass filter to below "26" from the program menu. I've tried sampling att different sample rates and levels, but the issue remains the same. My filter on my s612 does the same thing also..

Is this by design or do I have a faulty unit?

It looks like this on a graphical EQ:
https://imgur.com/8NUca5f

Here's some wavs to illustrate this:
https://wetransfer.com/downloads/f61ac0 ... 526/ea6631
(Filenames indicate when the peaks start)

Thankful for any help

Don't know if my 950 does the same (Its already in a moving box) but since your 612 does the same it's probably 'by design'. I don't know what causes this but as you said it happens below the 26 setting. This is the value with the lowest frequency of the filter (0-25 won't close the filter more). would be interesting how the loudness setting (in sample edit AND the loudness setting in keygroup) affect this. I can imagine that this won't make the peaked signal louder.

peace

yea that is normal behavior