I have looked over the TAS5630/31 data sheets for any information on low frequency reponse to no avail. On the analog input version TAS5630 you can do an input stage which blocks DC and for the PWM input version TAS5631 you can use the TAS5518 front end which has a DC blocking function but in the TAS5630/31 itself is there any internal DC blocking or is any input DC component applied to the speakers?
Thanks,
Ray Haynes