Sharing a subwoofer with 2CH and HTs rigs!

In the velodyne manual it expressly IN ALL CAPITAL LETTERS AND BOLD says do NOT use both low and high level inputs concurrently... 😕

Mesch- I certainly don’t need to have both amplifiers on, and don’t plan on it. My worry is that, by accident, at some point I WILL, and want to avoid that possibility! 

I’m also pretty sure most of the big box places like Best Buy do set-ups like this in their auditon rooms. I just want to be 100% sure as I really like this Velodyne sub and they’re not easy to find anymore.

Thanks everyone. A sound engineer I know thinks it won’t be a problem. I’ll be trying it later today and will post the results in case anyone else is interested. I searched everywhere I could think of on the internet and couldn’t find anything! 

Thanks. I have an older Velodyne that has line level/LFE and speaker inputs with one dial for crossover level and one for sub volume, but I’m not worried about which input on the sub (I need to live with the RCA inputs if I’m gonna use two amps as separate inputs). Just trying to figure out if the switch box is an effective tool to split two amp signals into the subwoofer. Worried about sound degradation or it being a problem somehow for the sub or amps...
Is this the way to do it? Or are there other options?

Thanks, Mesch. That’s on point, and getting me closer to the answer I need - but your solution seems to say that the SYS or even any cheaper RCA switch box won’t keep the sub from being fried if the two amps happen to be on... Do passive switch boxes send current from both inputs even if only one is selected? I guess that’s the crux of my issue. It would really be the same as running both amps directly into the sub at once through different inputs and hoping I never make the mistake of having both on at once.... Does anyone know if there is a switchbox or rca cheap pre-device similar that will preclude having to worry about both amps being on at any point?? Or would the SYS and switch box be okay? Thanks a ton, guys. Flynn

Hey, James. Velodyne is out of business. Talking to some pro audio guys about it to see what they say. They do this kind of stuff all the time, I would guess.