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i under stand that subs go in to enclosures and it is best to follow what the manufacture says when selecting or billing a enclosure

it is just what about 6x9's and 6" speakers what about them is it better to put them in a enclosure and if so should it be vented or sealed

i ask because i when to a super-cheap auto to get some lock-tight and i over heard a salesmen saying to somebody that it is best to put all speakers in enclosures

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All speakers will perform better when in enclosures. Like speaker towers for surround sound systems. Just becomes a bit impractical mounting boxes in car doors so its usually just left without one. A few people have actually made them for the 6x9's in the rear as there is a bit more space.

Putting your speaker inside an enclosure can yield great results - I have played around with this before and you can hear the difference between boxes - I tried blindfold tests with a friend, he didn't believe me they were the same type of driver. At the very least, sound deadening is a must, if you can - box them. I prefer a sealed box for a bit tighter response, but if you want big bass, then vented is the way to go. It all depends on how far you are prepared to go to get the best sound out of your speakers - even a great speaker can sound rubbish if mounted poorly.

Not really

Most 6" and 6x9" car speakers are designed to run infinite baffle.

That means that a box of the correct size would be too big to use in a car.

It is however very important that the speaker is mounted so the front of the speaker is sealed from the back of the speaker so the soundwaves don't cancel out.

Use plenty of sound deadener eg. Dynamat on your doorskins and parcel shelf.

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