Need Sub install help

tyhuck · June 8, 2013

OK, well I might have a problem. The subs and box came in today, but the HU wont be in till Tuesday. So, all I can do it test fit the sub box. While doing so I noticed that the subs will be rubbing on the back of the seat, and its keeping the seat from latching in position. Anyone else have this problem?

Carder09 · June 8, 2013

I like the MIDI fuses

Only problem with those is that they don't handle higher end systems like the ANL's do so I typically stay away from them also.

As for your box and subs rubbing, yes, I have the same issue, the best thing you can do for now is remove the trim paneling from the back along with relocating your jack to get is as low as possible to the floor, leave the jack screw and drill a hole into the box and that will act as a safety type and you can run a washer and bolt on it to prevent theft or at least slow him down if you hear it taking place. I have been working on a design that moves the rear seat an little bit forward, just enough so that the subs aren't hitting the back seats. For now, I usually will throw the back seats down and jam if not, I put the the SW setting to -5 and still get enough bump to satisfy me.

Chris · June 8, 2013

I am only running a 750 watt amp to 2 JL 10w3's

Carder09 · June 9, 2013

I am only running a 750 watt amp to 2 JL 10w3's

I'm guessing you have an down firing sub box under the back seat? My uncle had a box with two tens in an down firing box he had in his old Chevy and they were loud!

tyhuck · June 9, 2013

Only problem with those is that they don't handle higher end systems like the ANL's do so I typically stay away from them also.

As for your box and subs rubbing, yes, I have the same issue, the best thing you can do for now is remove the trim paneling from the back along with relocating your jack to get is as low as possible to the floor, leave the jack screw and drill a hole into the box and that will act as a safety type and you can run a washer and bolt on it to prevent theft or at least slow him down if you hear it taking place. I have been working on a design that moves the rear seat an little bit forward, just enough so that the subs aren't hitting the back seats. For now, I usually will throw the back seats down and jam if not, I put the the SW setting to -5 and still get enough bump to satisfy me.

Damn, why didnt I see this post sooner. I already removed the screws from the floor. Damn, damn, double damn!

Oh well, If I sell the truck I will just put the stuff behind the seat and call it good unless I let the subs go with the truck.

So, with eth subs that close to the seat, do you notice any muffled sound? I have 2 small children so I will not have the ability to drop the seats due to carseats being strapped in. (Dont worry, Im not one of those parents that jams out with kids in the car. I will wait until they arent with me)

As far as hearing theft, I doubt that will happen. I actually slept through someone cutting donuts in my front yard last night. Thats a whole other rant though.

tyhuck · June 9, 2013

OK, a couple more questions.

1. I was hooking up all my wiring and i noticed that there are two positive terminals and two negative terminals on the amp, as if there was two channels. I thought this was supposed to be a single channel amp. How do I wire things up? Does it matter which terminals I tie into?

2. I am concerned about how I have my subs hooked up. Each sub is rated at 150w RMS and 300w Max. The amp puts out 250w at 2ohms. Does installing 2 subs in parallel divide the wattage in half, or is each sub receiving the full 250w? If they are each getting a full 250w, is it safe to overpower a sub that much? I dont want to burn anything up, but I dont want my system to be barely audible from behind the seat either.

Chris · June 9, 2013

OK, a couple more questions.

1. I was hooking up all my wiring and i noticed that there are two positive terminals and two negative terminals on the amp, as if there was two channels. I thought this was supposed to be a single channel amp. How do I wire things up? Does it matter which terminals I tie into?

2. I am concerned about how I have my subs hooked up. Each sub is rated at 150w RMS and 300w Max. The amp puts out 250w at 2ohms. Does installing 2 subs in parallel divide the wattage in half, or is each sub receiving the full 250w? If they are each getting a full 250w, is it safe to overpower a sub that much? I dont want to burn anything up, but I dont want my system to be barely audible from behind the seat either.

1. It is still Mono. The positives and negatives go to the same terminal on the inside of the amp. They know we bridge 2 subs on mono amps so they decided to help us out

2. Each sub will receive 125 watts depending on the true resistance. My 4 ohm subs bridged have a true resistance of 3 ohms. In theory each will receive 125 watts wired in parallel.

tyhuck · June 9, 2013

So, just so im clear, if I run both subs in parallel there isnt actually any risk of overpowering. If each one is getting about 125w on a parallel circuit, would it be better to run each sub on its own side? Would that send each sub 140w or would it split that and only give each sub 70w? Sorry for so many questions. This is only my 4th system to put together, and my fist with a mono amp.

Chris · June 9, 2013

Both positives are tied together in the amp. So even if you use both positives and it looks like you wired them separately, they are still wired in parallel and will still be receiving 125 watts.

tyhuck · June 9, 2013

Thats right. Sorry, i had a brain fart. I keep thinking 2 channel.

Thanks.

tyhuck · June 11, 2013

Well, I got it all hooked up, and I will have to say, the JVC KD-R80BT head unit I bought it Amazing. I spent hours just playing with the colors, settings, handsfree phone connection, etc.

BUT,

I will have to say that Im disappointed with the amout of bump that comes from the subs. Under normal listening level, which is probably low by others standards, it adds a nice level of bass to the sound, which is a nice addition to creat a nice rounded sound. However, when I play some songs with a good bit of bump to them, the performance is kinda disappointing. With my old 10" Kicker Comps, I could rattle the mirrors if I wanted. This setup just wont. Im not sure if its the subs, if the box is not big enough, or if the amp just isnt big enough.

Subs: Rockford Fosgate R1S410 10" Prime 4-Ohm Svc, 150w RMS, 300w Max.

Amp: Kicker Refurbished 11Dx250.1, 140w @ 4 ohms, 250w @ 2 ohms

Box: sealed box of unkown build, 1/2" MDF, .6' air space per chamber.

Subs are wired in parallel, with amp gain set all the way up, and bass boost setting toggled on.

What do you think the most limiting factor is?

Chris · June 11, 2013

Not sure. I have my subs turned damn near all the way down

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99k1500 · June 11, 2013

In my opinion:

Box Size is too small
Amp is underpowered
entry level sub

That being said REALLY look at you box size 1st off is it really .6 cu ft per sub? On the inside? This sub has a recommended air space in a seal enclosure of .75 cu ft. Keep in mind that is .75 left over AFTER the sub takes up some volume The sub itself takes up 0.007 cu. ft. Which is not much at all, but it is a subtraction. Remember the enclosure is a means to effeciently transform mechanical motion into sound waves. The space factor is a big reason many guys go with a single sub setup in these trucks.

1/2" mdf is pretty thin. I know you are trying to get the maximum volume in a tight space but with any kind of motion the 1/2? flexes quite a bit.

You could try some polyfil. Polyfil (essentiall pillow stuffing) acts in such a way the box behaves like their is a larger air space. Sometimes up to 30%. Using polyfil will slow down the back wave coming off of the sub. You should end up with some deeper low's, and loose a little punch.

Your subs will need a little time to break in and loosen up.

Is your crossover set correctly?

tyhuck · June 11, 2013

By crossover, I assume you mean the HPF or LPF setting? If so, I have it set to low, I think. Ill double check that. If thats not what you mean, you will have to educate me.

Carder09 · June 11, 2013

I have kicker shallow mounts in mine since they were the only ones that I could fit such a small box. I also matched my amp with my subs so they hit perfectly. I also poly filled my box even though it didn't necessarily need it, it helped with the lows. You will also need to fine tune your subs or they won't sound good at all. Could take to a audio shop and pay a small fee to have it fine tuned.