WTF. I just checked, and those speakers are like $89.
You want to go way out of your way to protect $180 in speakers from getting stolen? BWAHAHAHAHAHAHAHAHAHAHAHAH.
No thief will barge in and head straight for those, sorry to burst your bubble.
Main targets:
- Head Unit
- Airbag
- Amp
- CDs, change, any loose items
- Sub enclosure, if not bolted down
If a thief has enough time to yank your 6x9's, then they also have time to take your seats, front speakers, engine, steering wheel..jeez, they might as well take your entire fricking car.