I upgraded the front speakers with 4.5" kenwoods, disconnected the rears
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(they are a waste of time, only3.5") Built 2 sub/mid boxes that sit behind the seats with 6.5's in them.
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The boxes are sized to allow the T-bars to sit on top of them and the least loss of travel on the seats.
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Boxes are powered from small 4 channel amp
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( just happened to be lying in my garage) under the passengers seat.
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Head unit is a Pioneer cd/mp3 player.
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The difference in sound quality is amazing
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(IMHO)
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![Image](https://jlawson.co.uk/originalsite/Various/slides/Boxes%202.jpg)
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hth
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Jimi