subwoofer, Vandersteen 2Wq tolerance

With multiple stereo and HT systems, I have multiple subwoofers.  The odd man out became the Vandersteen 2Wq sub, not because it doesn't sound great (it surely does), but I upgraded to a REL B-1 in my primary system as I like being able to use that with my stereo and HTS. 
In yet another stereo system, that sub has crapped out, a Velodyne FSR12, that isn't worth fixing.  I was connecting this one using an Outlaw Audio bluetooth connection rather than hard sub interconnect (the sub is too far away from the stereo amplifier).  This was working fine until the Velodyne died (I've had it for over 20 years, so got my money's worth).  The thing I was always uneasy with was when I turned off the amplifier (not the one in the sub) there would be this "thud" sound.
So, I'm thinking this may be a bad idea to replace the dead Velodyne with the Vandersteen (even though I'm not currently using the Vandersteen (I don't want to kill it either).  I'm losing the better benefits of the Vandersteen 2Wq like reading the amplifier impedance and those expensive filters that I bought for a different amp to integrate so nicely.
The Vandersteen does not have a power switch and I'm worried I'll hurt it every time I turn the system off.  Any thoughts?