I had an older Pioneer Premier headunit and loved it. Tons of adjustments that most units didn't have at the time.
I had stock speakers and it made them sound good.
EDIT: Pioneer now calls their Premier brand "Stage 4" and they're mighty proud of it too; if price is any indication.
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2008 Chevrolet Silverado 1500 LT1 Z71/4x4
2000 Oldsmobile Alero GLS - Sold
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