Just installed Infinity Ref 3032cfx speakers in the dash corners of my 2019 Ram 2500 with 8.4 base 6 speaker system. Even someone with 30 years experience as an electronic tech can be a Homer on occasion. Read on and many may find out they'd made the same wiring mistake.
My mistake was wiring the included 270uf capacitor in series with a 4 ohm resistor to the positive speaker terminal. Sounded awful. Then I thought, why do I need two capacitors? Should I remove the 4.7uf that's already mounted to the speaker from the factory. So I searched on this double capacitor situation. I found a formula and a chart all should have, chart at least,
https://www.sonicelectronix.com/item-17962-The-Install-Bay-BB99.html.
If you use the formula, a x b/a +b where a,b are the two cap values, the answer became kinda stupid, 4.62uf. Remember the premounted cap value is 4.7uf. All this work to get the same result if I'd done nothing adding the big cap in line.
I also mounted a 4 ohm resistor, so even then, should that not have done something? Please, all look at the chart and see how putting a resistor in series to make the speaker 8ohms also changes the crossover point. I had taken a stock speaker with a 8000 hz crossover and made it 4000hz based on the chart. Should have a little better low endish sound I thought.
No matter with my first wiring above, the speakers sounded like there was no low end, low mid nothing, no mids at all, just tin high end. This sounded like a hole between my front door speakers and the dash, not full sounding between both. So I re-wired the speakers removing the 4.7uf caps. I was a bit concerned that now, according to the chart I was putting the cross over at around 100hz and that could damage the speakers by using just the 4ohm resistor and the 270uf cap in series with the positive terminals.
Well folks, I got my magic. If you wire it like my last sentence you'll see. If this is all you plan to do mod wise it's the best way to go. With just the stock system, blue door speakers and these speakers you'll get the best sound out of your stock system. Quite frankly I was shocked and for the first time I like my radio. I blasted it and so far nothing popped so alls good. Voices and guitar, anything mid is smooth and full. I'll post a picture of my wiring and how I mounted the components on the back of the speaker magnets. Also I'll have a comparison then with faisal 8ohm speakers I ordered to see if I can get rid of the extra resistor.
edited to remove 4k ohm resistor and put 4 ohm instead, my apologies to those that read it before the change