Guys,
I have Pioneer 7950 Coupled with the JBL 210W rear speakers and JBL component speakers. i am not really convenced with the sound output

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Earlier on my old car i had a sony 350S attached to a 210W cobra and xplod rear speakers. The performance was awesome

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Compared to that pioneer gives a sluggish performance. I feel that that bass effect is not all that great. More over there is bit of jarring on high volumes.
Kindly give your valuable suggestion on improving the performance.
P.S: Pioneer is fiitted to Swift VDi.
Sony Was in Esteem.