Perhaps someone here can tell me if I might have a problem doing this since I've gotten conflicting info elsewhere. I want to connect the speaker outputs from each of my Class D Audio SDS-450 mono amps, which have a floating ground at the speaker outputs, to my ACI Force subwoofers. There will be one sub for each SDS amp. The sub amps only have line-level inputs but came with speaker to line level converters as follows:

The sub amps have an input impedance of 10K ohms.
Will this work or am I in danger of damaging either my amps or subwoofers given that the speaker outputs have a floating ground?
Thanks in advance for any advice you can provide.