The Rythmic webpage for the F15HP lists an upgrade that provides one XLR in, one out, which I assume is used to connect dual-sub setups on pre-amps which have only one XLR output.
The item number is: H600XLR2
Can I order this when ordering F15HPs through Ascend? I don't see them on the website, but can I order them over the phone, for example, or do I have to go through the Rythmic website?