Jonathan, need your help on building a box for Avalanche 15
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Silver Member Username: Suleman36Post Number: 672 Registered: Feb-05 | I will be running my Avalanche 15 off of my jl 500/1 or my zapco500m referance. In either case i whould like to go ported. I mainly listen to RAP and Electronica music like Chemical Brothers and Others. I whould like the system to work well toghether like front stage and sub lows etc..... My componant set consists of Image Dynamics CXS62 2 ways that do 150rms each. I will be running them off of a ppi art 300.2 . Having said that, what whould be a good freq. to tune the box to if its going in a camry trunk and what size of a box should i be looking at if im running it off a 500/1 amp? Your expertise will be appreciated. Thank you |
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Gold Member Username: InvainMichigan United States Post Number: 2055 Registered: Aug-04 | MO, ask Chad. I know they like BIG ported boxes, as in 5 - 8 cf, but Chad will be able to tell you everything you want to know. |
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Silver Member Username: Suleman36Post Number: 675 Registered: Feb-05 | To make life simple, i just got this email from chad. "Thanks for your email. Do you have any idea if you want to go ported or sealed? Ported will give you the most output overall with less power, but sealed will have a little better SQ. Both will play loud, but the ported will definitely have the advantage there. A ported enclosure for the Avalanche 15 should be 3 to 3.5 cubic feet tuned arond 27 to 30 Hz. A sealed enclosure should be 1.5 to 2.5 cubic feet. Your available space for the enclsoure may make this decision for you.  Both amplifiers sound like they will do a great job. The Avalanche subwoofers get very loud without a ton of power so I think that either one will do very well. If you want to keep the drain on your alternator in the low side, you might want to stick with the JL 500/1 since it is class D. This is a much more efficient type of amplifier than class A/B and will need less juice from your battery. I don't know for sure if the PPI is class A/B or not, but I think it is." Now that we know its gonna be smaller then 5-8cf that will be a relief for space issues in cars. So it looks like 3 to 3.5 cubic feet tuned to around 27-30 Hz is the optimum choice here guys. |
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Gold Member Username: InvainMichigan United States Post Number: 2060 Registered: Aug-04 | Well MO, to put is simply, the larger the box, the more your gonna get in the low end frequencies. If you made the box 3.5 cf, it'll play the lower frequencies louder than a smaller box. On the other hand, if you make the box smaller, such as 3 cf, then your gonna have better sq, because of a smoother response curve. |
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Gold Member Username: InvainMichigan United States Post Number: 2061 Registered: Aug-04 | I'm also getting an Avalanche 15" (just try and guess who talked me into it). I already have the amp, Orion HCCA 250 G5.1. I just haven't gotten the darn sub yet. I'm gonna go sealed, because of the improved sq and limited space in my car. I am gonna go for the larger sealed, about 2.5 cf, because I personally love really low stuff, and the louder the low's, the better. |
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Gold Member Username: James1115Wilton, Ct Post Number: 2358 Registered: Dec-04 | hey MO I think Nick told you exactly what you needed to hear! dude just make the box and install everything and let us know how it sounds because you are questioning everything way to much, and I can tell my boy Nick is getting perturbed with all of your questions that seem to be repeated way to often! Dude the avalanche will sound good no matter what enclosure you run and dont worry about it so much. |
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Silver Member Username: Suleman36Post Number: 677 Registered: Feb-05 | Im guessing james longo got you into it.lol by the way i have a nice componant set up front (image dynamicCXS62) gonna power that with my ppi art 300.2. I wanna blend my front stage with my lows...you have any other suggestions on what box whould be the better choice in my case. |
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Gold Member Username: InvainMichigan United States Post Number: 2064 Registered: Aug-04 | At what frequency are the ID's gonna pick up? (how low will they go, or how low are are the crossover's set) |
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Silver Member Username: Suleman36Post Number: 679 Registered: Feb-05 | Voicecoil single 2 ohm Nominal Impedance (IMP) 2 ohms DC Resistance (Re) 1.8 ohms Sensitivity (Spl) 91 dB Recomended Power 75-150 watts Frequency Response 45Hz - 25kHz in door i havent installed them yet but cant wait. |
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Gold Member Username: InvainMichigan United States Post Number: 2070 Registered: Aug-04 | I would say with a good component set you can go with the bigger box and get more low end outta your sub. |
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Silver Member Username: Suleman36Post Number: 680 Registered: Feb-05 | So sealed or ported..if ported what freq whould be offer the best in my case.? |
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Gold Member Username: Jonathan_fGA USA Post Number: 3697 Registered: May-04 | Freq would be dependant on the results you want to achieve. 30hz is a good frequency with a 15" for all around SQ/SPL, something lower like 25-28hz (look at your resonant frequency, though, don't want to go at or below it) will give more depth and SQ. Chad gave a good recommendation, 3-3.5 is great for a 15" sub. Now you just have to decide how much space you have to fit this thing in there That will affect how big your port area can be. |
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Silver Member Username: Suleman36Post Number: 681 Registered: Feb-05 | Whats the formula used to determine squarefeet? so i can get the dimensions of my car. |
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Silver Member Username: Suleman36Post Number: 682 Registered: Feb-05 | btw jonathan, i dont know to much about snail shell enclosures..but how whould they compare to a ported box.? I checked out www.powered4sound.com and apparently they build them. |
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Gold Member Username: Jonathan_fGA USA Post Number: 3702 Registered: May-04 | The formula is L x W x H/1728 (1728 is 12x12x12, so if you divide by that you'll get the cubic footage). Snail shells are a varient of a transmission line/horn type enclosure. They use a throat, choke, and the port to produce extra output, basically a transmission line that is made smaller via the choke. SQ is good, SPL is great, but they kinda have an iffy reputation. |
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Silver Member Username: Suleman36Post Number: 684 Registered: Feb-05 | So im probably better of ported. Thanks for the help. |
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Silver Member Username: Suleman36Post Number: 685 Registered: Feb-05 | this was the last enclosure i had in my car http://www.jlaudio.com/enclosures/CVS212RGW6v2.html and it was 4.23 cubic feet which means i can fit the Avalanche 15 ported no problem at 3.5 cubic feet.. |
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Bronze Member Username: Loc_outPost Number: 58 Registered: Feb-05 | MO make sure to let me know how the avalanche sounds! |
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