Question 1

is speaker wire supposed to be soldered to the hook-ups?

Accepted Answer

Yes and no. Soldering the connection will work fine and will likely be a great connection. But read on-  Solder tends to wick up the wire when being soldered. The point where that stops is a high-stress point. Since this is an item that tends to vibrate(the whole point of a speaker), and since copper is a material that work hardens, this can affect long term durability. After a while, the wire will have a tendency to snap. Some would say that this would be a prime example of when crimped on spade connectors should be used. Excellent crimps are not the easiest to achieve both in technique and in tooling. An average crimp will probably have a similar failure rate to an average solder connection. Both of which should last several years. For a better solder connection, use a smaller amount of solder that doesn't wick too far up the wire with a bit of heat shrink that makes the wire bend past the wicking point.

Question 2

can i connect this to class d subwoofer amplifier?

Accepted Answer

Yes, you can...but be mindful of the power rating. These are rated at 40 watts, and while they can likely stand slightly higher peaks, if you were to connect them to (for instance) a 100-watt or higher amp and run at high levels (approaching the 100W rating) for extended periods, you risk cooking the voice coil...which obviously means the end of your exciter! Stick with the ratings and have fun! :-) 
Also, please be aware that the frequency response, on these, drops off pretty sharply anywhere below 100Hz! So, if you were planning to use these as subs, you may be a bit disappointed. These are not the 'floor shakers' that you may have heard of, though they're based on similar technology. Good luck!

Question 3

Does this come in a pair?

Accepted Answer

No, just comes with one. Which is a huge rip off. Check out Parts Express and you can get them for between 20-25$ a piece.

Question 4

Can these be placed on large glass windows in a home?  Could it crack the glass?

Accepted Answer

They definitely could be placed onto a hard surface like glass. They will sound like a tweeter.  These are very heavily influenced by the shape and material they are placed upon. The relatively large window panel will help longer wavelengths (lower frequencies)but will be overshadowed by the stiffness of glass (which will really bring out shorter wavelengths(higher frequencies))  As for cracking the glass, it is unlikely, however, there are certain frequencies that allow you to add energy over time and add to the previous wave of energy making the overall amplitude higher. Think about how a child gets a swing to move and an opera singer can crack a wine glass. Which brings up a very similar question, will singing break glass?

Recommended Uses For Product	For Music Players
Compatible Devices	Smartphone
Subwoofer Diameter	32 Millimeters
Surround Sound Channel Configuration	1.0
Color	Black
Included Components	No
Item Weight	136 g
Is Waterproof	False
Item model number	DAEX32EP-4-S
Is Discontinued By Manufacturer	No
Color Name	Black
Speaker Amplification Type	Passive
Output Wattage	40 Watts
Color Screen	No
Wattage	40 W

Dayton Audio DAEX32EP-4, 1.3 inches (3.2 cm), Super Strong Type, Exciter, 40W, 4Ω, Black

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