Even if you gave the sub a fancy name, when it arives home and the partner sees the size of it she will still go off her head anyway (and probably force you to take it back).
Anyway since when has fear of the wife grasped the male population?
The best cure for it is to be clever. When you buy something that she might not like, you go out and buy a dress or lipstick or a ring (or whatever else wives like). Then you make sure you get home first and install the sub and when she walks in you greet her with a big smile, passionate kiss and from behind your back out comes the present for her as if by magic (during this time the stereo plays her favouite song, with the sub emmiting those nice and sweet low tones). Rest assured that she wont even notice the sub (or even if she does she wont mind).
PS: by the way dont ruin the moment by asking her for 'love making' because then she will think that you gave her a present because you were after only one thing (and no, i dont mean the sub either). If she asks you for 'love making' then that's a bonus.
That's all the psychology you need to know about it i think.
PPS: if the above doesnt work then i am affraid it's time to et rid of the wife. Oh hang on, on a second note that might cause more damage coz she will make sure that the sub is part of her hefty divorce package. Not because she likes it but because she wants to make sure that she demolishes it with an axe and sets it on fire after.
