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Pick one that's 2 ohm stable, and wire your w7 to 1.5ohm. With box impedance rise, you'll be safe, as the actual impedance the amp sees will more then likely be closer to and over 2 ohms most of the time. Plus music is dynamic, so it's always changing. Really would only have to worry when running lots of test tones, lol.
As to not having a knob, set the amp up with the bass cranked on the deck. Then when you want less bass, turn it down. Will act like a bass knob. Be careful, as now your are pushing your factory speakers harder!
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