Originally Posted by armysgt1
I'm assuming the 4 ohm version will drain my battery slower.
That is an interesting statement. Offhand, I was going to post that the impedance of the subwoofer won't affect battery drain. BUT! Losses in amplifiers are proportional to current, which is inversely related to impedance, so what you say is actually correct, though not by a huge amount.
I worked in this area for many many years, and due to those losses I do NOT believe in loading down amps to their lowest impedance. Even if the amp is rated at 1 ohm, for example, I'd run at 2 ohms, to get just as much real-world power with less heat and less current drawn from the battery. This is my firm belief based on measuring a lot of amps, testing with the PowerCube, and intimate familiarity with the real impedance of speakers (which are NOT like the resistors amps are tested with).
--> Yeah do the 4 ohm sub
Speaker power ratings are meaningless (see below). That amp will play those speakers and sub pretty loud. Loud enough for you? That I can't say.
I can say to play a lot louder I'd be getting into like 8" woofers with horns and massive subs, and yes separate and significantly bigger amps-probably not what you have in mind for your pontoon.
Here are "Head_Unit’s Rules Of Protection" to digest:
1) If when things start to sound distorted or odd you TURN IT DOWN, you are unlikely to ever break anything.
2) If you constantly "turn it up to 11"
you will break something.
3) The amp and speaker power ratings do not matter. Don’t bother “matching” the amp and speaker power. That is a seemingly sensible yet actually meaningless exercise, because:
- Speaker specifications are 92% useless (and I say that as a loudspeaker engineer).
- Specs for amps are not thorough since they are measured into resistors for pragmatic reasons and speakers are not resistors at all.
- You are less likely to damage speakers with a big amp, since let’s face it everyone cranks it up sometime, and a small cheap amp is then more likely to clip and possibly put out DC and ultrasonics
- Car amps' 2 ohm or even 1 ohm rating is the most meaningful even if your speakers are 4 ohms. Should be 20-20k Hz, distortion under 1% or it's baloney.
- For amps "more" power means (IF specs are comparable) at least three times as much due to the logarithmic nature of hearing.