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2015 Optima Optima LX
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New guy here. Previous car audio manager/sales/installer...

Personally, heres what I would do:

If you are keeping the factory deck, I would upgrade to a 4 channel amplifier for your highs and a Class-D amplifier for your sub(s).

Your factory deck puts out VERY little power. Thats why your factory speakers sound so bad. Its the distortion. And they definitely cant put out the bass you so desire.

So, heres the setup: 4 channel amplifier powering your factory speakers. You would have to use the line-in for the signal input (meaning no RCA cables). You will lose fade/balance controls. But most people dont worry about that. You will have to run the speaker wires from the amplifier to the individual speakers. Not as hard as it sounds. You only want treble and midrange from these speakers. So set the crossover accordingly. Even the factory speakers will sound 20x better with proper amplification.

For the sub: You can actually use a line-in for the input here also. There are a few different ways to go. Class-D would be preferred. That means that it handles lower ohm loads (typically down to 2 ohms, some amps handle 1 ohm loads). I would go with a dual voice coil (DVC) sub. Best bang for your buck. Each voice coil will attach to one channel of the amp.

As far as sub sizes, it really depends on how loud you want to go and what kind of music. I go for music quality. A single 12" sub would be great. Alpine Type-R is my favorite by far. You can use a smaller enclosure for those. Make sure you get the right size box for what the sub calls for. And I dont really like ported boxes. They sound sloppy. I like the tight, accurate bass. And stay away from bandpass boxes. They are a joke.

You may want to think about getting a capacitor. It goes inline between your amp and the battery on the power wired. Helps prevent lights from dimming due to the power system being constrained.

Hope this helps. Any questions let me know.
 

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Registered
2015 Optima Optima LX
Joined
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5 Posts
So a 2 channel amp bridged down to 1 ohm is just as good as a class D amp thats 1 ohm stable? Nope. Will overheat. I know that Class D amps are switching amplifiers. Thats what keeps them cooler. That coupled with the fact that the low pass filters are already integrated means they are perfect for running subs.

Almost every setup Ive done for someone with 1 sub was a DVC. Even 2 subs. Yes, I think its better bang for your buck. More installation and wiring options. And yes, there are single voice coil subs that are great. I never said that there werent.

Most ported boxes Ive seen/heard werent as good as a sealed box. That is my personal opinion. I hate the way they sound and dont think they are accurate. Sure, for a slight range of frequencies they are decent. Overall, I like sealed.

Most people putting systems in cars arent upgrading the entire electrical system. I understand what you are saying about a band aid fix. But some people just want better sound without upgrading all of it.

Ive put plenty of systems in Dodge Neons. Ive seen a LOT of lights dimming. Thats even using 0AWG wires.

So, oh boy... I do know what Im talking about :)
 
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