You will be losing a ton of sound quality by using those vent holes, way too far under the dash and a lot of the sound will go up under the dash and resinate around. They would work alright for a woofer, but any sound higher than that will get lost.
I have to disagree, somewhat of the sound quality. Sure, you're going to lose some but, I have heard worse. I have 4 Infinitys, no sub woofer and 300 watt amp.
Besides, they're virtually invisible...
I say go for it! Not using my vents either. Have VA. Note; make sure you seal up the door before you mount the speakers.
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