Hi kk,
here are my 2 cents:
Every car has different acoustics. The esteem has a big boot, while the swift doesn't. The boot of the esteem acts as a large enclosure for your speakers and gives better bass.
In short, to sum it up. You will get a different effect with the same equipment in different cars.
How are the JBL speakers installed in your swift?
Are they in a box? (If yes, how big is the box?)
Are they in the stock locations? (If yes, you cant expect much bass)
Or
Are they on a plank? (A thin plank will rattle at high volume levels.)
Do check the polarity on the speakers, as the others have mentioned. It is a very common thing for installers to ignore this very vital parameter. Wrong polarity will lead to Bass cancellation.
I assume you dont have an amp. If you do, try playing around with the gains (at sane volume levels, you dont want to end up blowing your speakers) and electronic crossover. (If equipped)
cheers!
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