I have two 900w Sony Xplods, but a 480w amp. I know they suck and that's horrible balance but they were given to me as a gift.

I'm not an audio expert, but when I had them hooked up to my old car (02 Pontiac Sunfire) these things hit HARD. I'd have to keep them on the lowest setting possible to keep my amp from overheating and they shook my whole car. but With my Maxima, now it's like I can barely hear them when theyre turned up to max from my head unit. I didnt change any connections, they are bridged and both pushing out just as much power as they were before (if not more). They just seem real quiet. I'm thinking because the layout of the vehicle is different and larger compared to the Pontiac, but it doesnt seem like a big enough difference to make that much of a difference in sound quality. Am I doing something wrong?

 

Are you running it through the Bose head unit or aftermarket?

 

attach to chain and drag behind the car the bouncing and beating the box gets from dragging it will give you more rumble then the speakers themselfs.

 

Cool thanks

 

subwoofers are not directional. It matters not where you put it.

 

not directional yes but subwoofer placement in the trunk CAN affect the overall volume in the cabin.

 

Make sure your polarity is correct

 

I purchased a new amp (1200w) and i'm waiting for it to ship. Hopefully the more powerful amp will have an affect, but I still dont understand why they rumbled more in my Pontiac

 

Different cars have different peak frequencies. For example, your old car may have a peak of 40hz and that may have also been the peak frequency of the sub which would make the bass sound louder in that range.

In every car I've owned, the sweet spot for the sub box is facing the rear of the car about 6 inches from the trunk lid.

 

Way too many factors, were you using a line out converter in the old car? What setup was in there with the subs and amp? Any aftermarket HU? Does the Max have an aftermarket HU?

 

Sorry for not being more specific. I'm using the same wiring technique as my old car (6 gauge power amp to battery, 6 gauge ground, RCAs and blue remote wire down opposite side flooring to HU). I have the same aftermarket head unit I was using in my old car (with sub out control). I've attempted every position of the box in the trunk and I get the same overall sound.

 

A few other factors I should have listed was that the guy that helped me wire my subs in my old car didn't bridge them correctly (or maybe he did). He kinda spliced all 4 speaker wires together and lodged them in one of the speaker terminals of the amp, but I forgot where.

I have them bridged correctly (I think). I took L+ and R+, spliced them together, and connected them to the + bridge terminal, then L- and R-, spliced them together, and connected them to the - bridge terminal. They're both pushing out power, just no rumble

I'm not a professional, this is kinda the second time I've done a sound system myself. I did my friend's in his Crown Victoria. He had two 10" subs with huge golf ball size holes in them and a 500W amp, and his car rumbles. Like what the s h i t...

 

AND that's another thing. The Crown Vic is larger than the Maxima, so size shouldn't play a part like that.

 

Make sure all your settings are right. When I first bought my speakers. I had to play with some buttons on the amp and change some settings in the headunit to make it hit as hard as I was expecting it too. When it was all said and done it was 10 times louder.

 

I've tried every combination possible. I'm thinking I need to bridge them differently. Not sure how the hell to do it, but I'll experiment. Reverse polarities or something idfk

 

Everything is plugged in? Nothing is hanging loose?

 

Correct. I thought that was the case too so I replaced the ring terminals I was using for the speaker wires, but still nothing. I'm yet to check the speaker wire of the actual subs yet because I have to unscrew them from the box, but that will be my first step before I start reversing polarities and s h i t.

 

So I rewired everything and tried every wiring combination possible, and I'm still getting weak sound. I really just don't get what the hell is wrong. Could it be that my subwoofers went bad?

 

dual voice coil? 1 could have gone bad

 

have a multimeter handy? measure the coil(s) on the sub and see what you get. post what you find. hell, snap some pics of the wiring and what-not.

 

On both of them though? At the same time? That'd be weird, but possible. What'd be the best way to check this?

 

Placement should be rear facing (subs facing trunk) and pushed baxk as far away from trunk lid as possible

 

And since theyre most likely single voice coil. Wire them at 8ohms to handle your amps max 4ohm mono load. Its easy check rockford fosgate.com tgey have a wiring wozard

 

Thanks for the help all. I think I'm going to just replace the entire system (other than my amp) and I think it was a problem with the box I had. I'm gonna give these ones to my girlfriend though since they still work, just not what I'm looking for.

Cheers.

 

cut out the rear decklid, mount them in the rear decklid, please look at my post in the audio forums, i have two twelves in a sealed box mounted in my rear deck, my seal on the back glass is probably going to fail soon, my roof also moves quite a bit, im loosing alot of sound because of vibration though, although you can feel the compression in the car, also at proper frequencies my eyeballs rattle.

 

Another thing to consider is the vehicle itself. There is a lot of sound insulation between the trunk and cabin, that didn't exist in your previous car.

The most bass is usually seen (If you aren't isolating from the trunk) with the box against the front of the trunk (rear bumper), and facing toward the cabin. You reduce back waves and allow the lower frequencies room to grow before hitting obstructions.

Though, in the 20Hz range, it doesn't matter, as the standing wave is 20' long.