Q Media M4 - Q. Does the subwoofer output on my M4 have a Low Pass Filter?
Answer:
The original production Q-M4 had a no Low Pass Filter (LPF) applied to the subwoofer output, later production after 2015 did have an LPF applied at 300Hz.
If you would like to check whether or not your Q-M4 has the LPF applied, please email the Support team with your serial number, support@qacoustics.co.uk