A great thing about Forums....they are a great place to express one knowledge and OPINIONS. Being in car audio for 18-19 years now,I have
always been asked which is better....this or that. Well Im gonna tell you right here and now. MOST car audio opinions of products are formulated
from experience and not facts/science. This is a FATAL FLAW in judging various products. The main reason is we as the asker do not know what the
circumstances were in each person. This meaning....what kind of enlosure was used,how well was it built,what kind of amp used,what kind of
deck,was there enough voltage supplied,was the right size wire used,was the system/speakers laid out for the proper sound enhancing,what kind
of vehicle.....you get my point...TOO MANY factors. BUT...I will say that I have used BOTH with there proper enclosure specs...both ported and
sealed.It is also difficult to judge alot of times because various brands/products perform suprisingly close sometimes. Sometimes you are comparing 2
great products. That is the case here. In MY opinion,both are exceptional subs and choosing the right one will determine what kind of sound you
are looking for. If you are looking for SPL,I suggest using the L7 in a ported enclosure or a sealed enclosure at about 10% more than recommended
air space. If you want sound quality,then go with the alpines at about the middle range of recommended air space. They will give you a range
between .65 to 1.0 cuft airspace...go around .75 to .85 cuft. As with any great sub,you will get great perfomance so long as you supply them with
ample power or with in RMS range. My rule of thumb is to supply the sub with at LEAST half of its RMS rating. Use a good amp(meaning not cheap)
or one thats CEA compliant 2006 and they both will sound great. I have used both at these subs with the aboved mentioned variables and that is
my opinon of them. Good luck.