No. The resistance in ohms you are running is dictated by the speakers (or load on the amplifier). Your set being 2.7 ohms will give you a slight increase in output, and a slightly bigger draw on your amp, but not enough to cause the amp stress.
it sounds to me like they hooked the tweeters to the crossover (or they would have fried by now) but bypassed the crossover and ran straight from amp to the woofers. Without a high pass filter on the amp (or without it on and set to a high enough frequency) your poor little woofers may be seeing down to 20HZ. Alot of music out there wont reach that low, so you only distort, or get sloppy on certain tracks.
Let us know what comes of it.

Correct polarity means that they hooked up the negative terminals to the negative outputs and positive to positive. If one of them gets reversed (positive to negative) you can get the popping sound you describe.

Sent from my Nexus 7 using Tapatalk

Correct. and yes, you "may" get popping if overdriven. Your main issue with being out of phase would be cancellation, and if only one side is out, your staging would suffer greatly. Your out-of-phase side will play at a lower level.

Did you put a speaker baffle on the door speakers?

If not try to enclose the woofer.

To me it sounds like distortion, what kind of files are you playing? off a CD? Radio? or Mp3? If Mp3 make sure your playing at least 328bps.

I would put a CD in .. one that is professionally made. (you bought in a store)

Keep all the settings on the radio at normal.

Do not use the Loud setting on the radio.

Listen to the CD. do you still have the poping?

If so you could have a blown speaker. you could have the speaker hitting a wire in the door. you could be out of phase, but I doubt it.

If you want to check to make sure the speakers are both in fase. Easy way to do this. take the door panel off, goto the amp, unplug the speaker wire coming out of the amp that goes into the speaker. take a 9v battery, touch the positive lead to the positive on the battery, touch the - to the negative of the battery, if the speaker pushes outward, it is hooked up correctly. If it does not push outward then its backwards somewhere. Do the same for the other side speaker, then make sure you hook back up the speakers (now knowing the correct polarity) to the amp with the correct wires going to the positive/neg.

If that all is working, check your settings on the amp, make sure High Pass Filter/HPF is turned off if it is a switch. If your HPF is a dial turn it to 80 or 120 depending on what you like. If it has both a on/off switch and a dial, turn it on and set it between 80/120.

Also check your settings on the radio, it could be a HPF built into your radio.

If you check all this, still sounding weird, you have a blown speaker/amp, or your trying to get more out of those little guys then what they can do. If so, add the sub.

If the bass drivers are out of phase, there will be a noticeable decrease in volume and the sound will become "muddy." Turn the treble/mid down or disconnect the tweeters/mids. Give a listen with the current setup (center your ears between the drivers for best results). Swap the wires on one of the woofers. Listen again. Should be obvious which way is correct. This will check the whole system from source to driver. Works best with a monaural source but not a big deal for checking bass.

The battery trick works very well to check the phase of the drivers but you may have a crossed-wire problem somewhere in the pre-amp/amp/crossover wiring train.

I just had these same speakers installed and heard a lot of "buzzing" coming from what sounded like the speakers themselves. I turned down my gain (a lot) and then was able to turn up the bass and it sounds a lot better. However, since I also have the base stereo, I need to buy an Equalizer to better adjust my sound and get some of my bass back.

UPDATE:

I took my car to nissan to have them turn off the lights that came on and after keeping my car a full day they called me back with some interesting news. They said the speaker wiring is all over the place and they're afraid to touch it. They said that they had drilled into the floors and that it's just a mess. Nissan recommended I take it back and have them fix the wiring without damaging anything so I can keep my warranty.

In my eyes, wiring is wiring, I can always redo it, cut my losses, file a lawsuit or whatever, but I just want my car to be ok :( I'm really ocd about keeping everything meticulous and new and I think I'm at a point of no return with this one.

Bigaudiofanat's going to socal pretty soon, no? your best bet might be to get his help.

here
http://www.the370z.com/audio-video/4...-build-11.html

Are these wires that the shop installed, or wires from the previous owner?

If its new wiring the shop did, I'd take it back to them and demand at least a partial refund.

The car is new, it's all shop. One shop did the HU which was fine but the shop who did all the other work claims the other guys made a mess which is why they had trouble. I honestly don't want them touching my car anymore but I feel like they have the best chance to find what wires they messed up

Why would your speaker installer proceed with the install and blame the other guy? Did it sound poopie before your polks? Even if the first installer screwed up the wiring, a good installer will be able to troubleshoot and find the source of the problem. If you are experiencing varying results at different times, it is possible the your h/u install has been compromised. The best way is to start from the source and head down the chain. Also,if your tweets are fine, then your crossover may be compromised. If you really like good and reliable sound, just redo the install.

Ya I have talked to kat a little bit about doing this.

:iagree:

I just sent you a PM but a complete redo is probably necessary. ugh what a headache. This is heart breaking for someone who loves his music. I'm never going after market with audio again