Hello sharkdc0529,
I'm not familar with the HK Business head unit, and could not find such in an online search. I thought it might be "Harman-Kardon" but struck out again. Anyway, most stock speakers will sound lousy with an aftermarket head unit. Take a look at the typical factory speaker (top photo) and an Infinity aftermarket speaker (bottom photo) on this
page. There's a world of difference in the materials and construction.
In addition to Infinity, I recommend Alpine, Kicker, and Rockford-Fosgate. You'll also find that Kenwood, Pioneer, and Sony make some excellent sounding speakers at very reasonable prices.
You'll need to know the size of the stock speakers and replace them with the same size. Also, be aware that most aftermarket speakers have larger baskets and magnets and will therefore have more "depth". Make sure you have ones that fit or that you have an appropriate adapter.
Hope this helps.
proton satria gti starts first tims but not second time
proton satria gti starts first time but not second time
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