Tell me Im crazy

[88crxsi 10+ year member]

my setup

deh-p6700mp head unit

Hifonics BX1205D

2 kicker L710's

Power acoustic p24-240 4 channel amp

Planet audio p30tw tweeters

Kicker dx 46 door speakers

coustic digital crossover

Ok now the problem

I go to get my shit installed. Spend two full days doing the install and building the box. I dont know how to build a box so I had a local guy help me. The box he built was amazing looking with a slide out amp rack thats hidden and everything. However this system sounds like shit. I talked to a bunch of people wacthed people on here talk about how the kickers get loud as shit. There not doing any of it. I had jbl 12's with a 300 rms jbl amp with the cone surrounds busted off and they sounded 100 times better and cleaner. The install is clean as hell crimped the wires, every wire hidden, nice clean box. We hooked everything up and we had interference because of some cheap rcas for the component amp. So right now Im just running the door speakers off the amp without the crossover and no tweets. The door speakers sound good. Here's what I believe to be the problem. I went sealed because he reccomended thats what I should do since I listen to country, rock and rap. I have heard speakers with less rms power to them way louder and cleaner in sealed so I did it. I heard alot of people on here and sound domain say there loud as shit in sealed but if you want them to really wang go ported. What I think wrong with the box is calculations. Kicker reccomends .66 cubic feet for the 10's. I asked him at the end how many cubes and he said around .66 Im also positive that its a faulty box. They dont get loud at all. When I play rap over 3/4's my cd's I cant play. It wont hit the notes and just flattens out. Even country. I turn it up on country and it sounds like some slamming a hammer against a chair. I know this box has to have somthing wrong with it. He tried telling me its the amp. He said that he doesn't think the amp has nearly 1200 rms. I know it has to have **** close because alot of you guys use them and talk about how great they are. Someone please give me advice what could be going wrong. Im about to go by a prefab fleamarket ported box. The ported box I got for my g/f's 12 type r has more low end hard hitting bass with 300 rms running to it. I know there is somthing really wrong because kicker is a spl sub. I don't have skills to build a box. Should I just get a pregfab ported? O tried tunning the amp and the cd player and it still sounds like ***. The guy that built it thought it was good and loud. I have heard 2 10's from walmart with cheap *** amps louder then this so i know im not crazy. If I am tell me haha

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[supa_c 5,000+ posts]

Your crazy

 

[ss3079 5,000+ posts]

Maybe the box isn't completely sealed.

Drivers wired out of phase? Hopefully you have the dual 4ohm L7's so it's wired to 1ohm for that Hifonics.

Were the gains and filters set correctly?

If all else fails, build a ported enclosure ~ 2.5-5.0ft^3.

 

[swaptrex 10+ year member]

something is obviously wrong.........

 

[88crxsi 10+ year member]

Yeah there the dual 4. Idk if its not sealed or whats going on. Am I wrong shouldnt it be pretty **** loud even sealed? Can someone help me out before I spend more money. I already payed a bunch of money for this stuff I want it to sound good. Does the hifonics put out 1200 rms? Or is it overated? If I get a ported box it should be loud shouldnt it? I always here people talking about these subs are so loud you can hear the person coming down the street. These are no where near that. Is anyone running a hifonics amp to there kicker l7's so I can get a oppinion on if they things should wang or not?

 

[88crxsi 10+ year member]

No one has any ideas? The two 10's should hit hard shouldnt they? If I go ported with my amp I should be able to get loud right? I need some input so I can figure out what to do here.

 

[WheresTheButta 10+ year member]

ABSOLUTELY sounds like they're wired out of phase. try that first, if you dont know what that is or what it will do, i'll tell you. it means one subwoofer is hitting out, the other is hitting in, and they're canceling each other out big time. This problem is due to a simple wiring mistake. Make sure the wiring is done properly, get the box opened up and take a look - use the manual you got with your subs to find a diagram of how they should be wired, follow that. This would also screw up your ohm load if i'm not mistaken, further ruining the sound potential of the setup. You are right though, that setup should be loud as ****, my friend has 2 L710's. If my recommendation doesnt fix it, try getting new rca wires, I had a bad pair of rca's and it ruined everything - they'll do that to you.

 

[Savstyle 10+ year member]

^ im with him does soun like ther out of phase. and check 2 c if ur box is sealed.jus turn on ur system play it and move ur hand aorund the edges were the pieces of wood r glued together. buy a good pair of rcas cus tehy cna mess up everything.and yes those l7s should b really loud.

Edit: what r your gains and your corssever set at along with yopur bass on your deck

 

[88crxsi 10+ year member]

Ok guys thanks alot for the input. I'm going to go outside today and play with it and see if I can figure somthing out. They could be out of phase because they were wired up orignally the wrong way and would play. I knew I wasn't crazy because kicker's are meant to be loud. Im thinking maybe also the design of the box could be faulty. I will take pics later and give you further info once I check it out a bit. Maybe you can help me from there.

 

[saywhat? 5,000+ posts]

please do, i would love to see the setup that u described.

 

[AznRevlAzn 10+ year member]

your picture is too big on your sig.

 

[saywhat? 5,000+ posts]

yours is as big/bigger with all your writing.

 

[88crxsi 10+ year member]

thats what I was thinking.

 

[Rawr-DQ 10+ year member]

Yeah it sounds more like something not set right. The wires are not switched around are they?

Maybe it's cancelling really bad, is it a cube? Try moving your box around facing diff directions like the back of the car.

I looked online about boxes and it said that in cubes w/ paralle sides cause sound waves to get all fudgy and sound bad, try stuffing your box with a lot of polyfill which will make it seem bigger and will help stop some of the "bad" waves being created by the paralle sides.

And definitly check all the settings, bad RCA's aren't as much of a problem as they said ^, I highly doubt thats the reason. Maybe a factor atmost, as long as it is not run right by the power wire.

 

[Rawr-DQ 10+ year member]

To be more specific about the "bad" waves I was talking about, here:

Avoiding Standing Waves

Most boxes are roughly shoebox or rectangular in shape. Technically speaking, this is a square prism. Unfortunately, these box shapes have a built-in flaw: box shapes with two or more sets of parallel sides will be prone to a phenomenon called “standing” waves. Standing waves are sound waves that reflect back and forth between two parallel sides inside the box. The frequency of a standing wave will have a wavelength equal to twice the distance between the two sides. For example, if two parallel walls are 24 inches (61 cm) apart, the standing wave that will develop between them will have a wavelength of 48 inches (122 cm). This corresponds to approximately 283 Hz. You can use the wavelength calculator to convert from the wavelength to the frequency.

A cube is generally a bad box shape since all of its parallel sides are equidistant. This means that all the standings waves inside the box will have the same frequency and will sum together, making them louder. This reduces the fidelity of the loudspeaker. But all is not lost if you really like the cube shape because there are ways to overcome standing wave problems. Here are a few suggestions:

• Add damping to the interior of the box. Bear in mind, that most of the commonly-used absorption materials have poor absorption coefficients at low frequencies. If your box is large, you should probably calculate the frequencies of the standing waves and check the absorption coefficients at those frequencies for the damping material you plan to use.

• Add one or more angled walls to the interior of the box. In this way, the outside of the box still has parallel walls, but the inside does not. These walls must be rigid and either have openings or be short in one dimension so that air can flow around them without any restrictions. Without parallel walls, standing waves will not develop.

• The frequencies of the standing waves can be spread apart so they do not sum together. It uses a 1.62 : 1 : 0.62 ratio between its three dimensions (height, width, depth) to spread apart the frequencies of the standing waves.

• Pick a box shape without parallel sides"