Mix -
Are you sure that was a JRX 225? That is a pretty new unit. The JX125 was the previous double 15" speaker (Brendan, the single 15" was the 115).
Here's the link to the 125:
http://www.jblpro.com/catalog/General/Product.aspx?PId=91&MId=3
and to the 225:
http://www.jblpro.com/catalog/General/Product.aspx?PId=454&MId=3
As mentioned, both are made of MDF ... basically a heavy particle board, so tell your partner to be careful in keeping them dry .. even out of humidity, as the particles will blister and come apart if moisture gets in.
I assume they are the 125 for the price and age .. there are some "fixes" on YouTube he may want to look into .. apparently make a big difference in sound quality: