subs near window?

Two possible problems from putting the sub near the window:

1. Bass will escape through the window, never to return.

2. The sub could vibrate the window and turn it into a large resonator (giving you a peak at the resonant frequency).

The first problem can never be cured.

With the second problem, this can be solved by increasing the mass of the window (thus lowering the resonant frequency to something lower than what your sub can do). I have no idea about those MarigoAudio tuning dots, but I would be skeptical if they had enough mass to treat a window.

You could increase the mass of your window by leaning something really heavy against it. Pad the corner of this object with some cloth/carpet and you're done.

Best solution is not to put the sub next to the window at all.

I have had dual velodyne 18in subs damage the seal between window glass causing condensation.

Here's a thought. From what little I know about how deep bass sound waves propogate I think if you are going to damage your windows (and that is certainly possible) you are as likely to do it regardless of where you place the subs. Also, consider whether or not there is a bass node where you are placing the sub.

To prevent damage caused by 'window' rattling sound (which is not necessarily the province of deep bass alone) damp the window panes or just turn down the volume a bit.

FWIW I recently traced a 'buzz' like vibration in my room to a framed picture on the wall. This was not caused by excessive bass. Just placed a little damping materiel between the bottom of the frame and the wall and it went away.