Audio goodies for the Denali

[lknox21]

Greetings!

I recently purchased an 04 Denali and picked up a bunch of new goodies for the audio system. The line up is as follows:

Pioneer avh-p4300dvd
Rainbow cmx 465 extreme 6.5" three way speakers (2 x 6.5 woofers & tweeter)
Alpine pdx-5 5 channel amp
JL audio 8w7
4 awg kicker amp kit
10 awg speaker wire x 50ft
Monster 4 channel RCA cables (crazy thick insulation)
Monster 2 channel RCA cables (same thickness)
Custom made enclosure for sub w/factory color carpet and Denali logo in raised lettering
Viper 5904 alarm

Plus other goodies like a reverse camera and an auto EQ mic for the head unit. The sub box is sealed and made to fit between the captains chairs in the back. I also have a DVD player and a 15" monitor to mount to the roof. I'm having trouble finding a way to install the monitor since the truck has a sunroof.

I will be installing all this starting on Friday and I will be posting pictures shortly afterwards. My main concern is what crossover settings I should use. I mainly listen to heavy metal but I am quick to switch to rap, dubstep, and everything between. I want to be able to "feel" the double kick from the drummer hence the 3 way speakers and the sealed enclosure. I've been told to set the LP around 65hz. Any suggestions would be more than appreciated.

Here's a teaser pic of the box to keep you visual people at bay.

Thanks

 

[abladeafficionado]

The general rule of thumb is to start at 80Hz LPF and HPF at 12db/octave and work from there. 80Hz LPF for the sub, and 80Hz HPF for the mids/tweets. Adjust from there to suit your tastes. I prefer 60Hz/24db HPF/LPF for my listening habits, but that's my preference. You may find anywhere between 60Hz and 100Hz to be the "magic number" for your ears.

Are you doing a 6.5" in each door? Or two in the front door? With 2 6.5"s, if you seal and deaden your doors, you should have plenty of midbass and that should help with the "kick" you're looking for with metal. Definitely seal and deaden your doors, it can be done for $100 with a roll of RAAMmat. That would deaden your doors, rear hatch, and enough to hit problem areas in some random panels like the rear panels in the third row.

You may find that 8" JL lacking in output, especially in a sealed box.

 

[Midgetclown]

ive got that same head unit and couldnt be happier with it. Cant wait to see the progress pics. Same interest in music too so really interested to see the updates.

 

[lknox21]

The general rule of thumb is to start at 80Hz LPF and HPF at 12db/octave and work from there. 80Hz LPF for the sub, and 80Hz HPF for the mids/tweets. Adjust from there to suit your tastes. I prefer 60Hz/24db HPF/LPF for my listening habits, but that's my preference. You may find anywhere between 60Hz and 100Hz to be the "magic number" for your ears.

Are you doing a 6.5" in each door? Or two in the front door? With 2 6.5"s, if you seal and deaden your doors, you should have plenty of midbass and that should help with the "kick" you're looking for with metal. Definitely seal and deaden your doors, it can be done for $100 with a roll of RAAMmat. That would deaden your doors, rear hatch, and enough to hit problem areas in some random panels like the rear panels in the third row.

You may find that 8" JL lacking in output, especially in a sealed box.

I will be putting one of the 6.5s and the tweeter in the front and the other in the rear door. I have 150 sq ft of fat mat extreme still left over from my OBS suburban to seal all the doors. I hope the 8 will be ok. I'm not really looking for loudness but more along the lines of quality. If its not enough then I may look at adding another. The box should have around 1.35 cubic ft of airspace so I hope it turns out well.

 

[abladeafficionado]

1.35 ft^3 for a single 8 sealed? That's a huge amount of airspace for that little 8. It'll probably unload at high volumes. That box is perfect'y sized for a sealed 12 though.

 

[lknox21]

Give or take a little. Thats also unloaded but it should be ok. If i need to remove some of the space i can put some wood blocks inside.

---------- Post added at 12:30 AM ---------- Previous post was at 12:27 AM ----------



Another teaser to apease the pic gods.

 

[abladeafficionado]

I just modeled up your sub and looked at the frequency response graphs. If you port that box you have to 30Hz, you'll get more output, and a flatter response curve. It's the perfect size for a ported box the way it sits.

The model says you'll pick up 6db from 30Hz-40Hz if you port that box versus leaving it sealed. I don't think you can expect 6db, but you should pick up at least 3db.

 

[lknox21]

I just modeled up your sub and looked at the frequency response graphs. If you port that box you have to 30Hz, you'll get more output, and a flatter response curve. It's the perfect size for a ported box the way it sits.

The model says you'll pick up 6db from 30Hz-40Hz if you port that box versus leaving it sealed. I don't think you can expect 6db, but you should pick up at least 3db.

Not really looking for spl. Ill give the sealed box a try and if im disappointed i will take it back to the builder and have it ported.

Will it make it tighter or just louder?

 

[abladeafficionado]

Ported gives low end extension. So the low bass notes will be louder. With a sealed box, low notes start to roll off at about 40Hz, and once you reach 30Hz the bass is fading out quickly.

It isn't louder all over necessarily, but it allows a flatter frequency response. So if you like bass notes to be loud, ported is the way to go. Sealed is easier to build, and rolls off more gradually, but if your components can cover the mid bass territory, a ported box will help get the added "oomph" in the lowest notes.

A lot of rap and dubstep makes use of those low notes, and you said you listen to those genres so I figured I'd suggest ported.

 

[04gibbstahoe]

I just modeled up your sub and looked at the frequency response graphs. If you port that box you have to 30Hz, you'll get more output, and a flatter response curve. It's the perfect size for a ported box the way it sits.

The model says you'll pick up 6db from 30Hz-40Hz if you port that box versus leaving it sealed. I don't think you can expect 6db, but you should pick up at least 3db.

For that much air space for an 8" I agree that a ported enclosure will sound much better, and of course louder.