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Amp power, box design, and hz tuning


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Posted

So, I'm getting back into this whole system building thing. I'm no expert! I'm actually self taught, so I'll probably be a little backwards.

So what I have got for speakers now is

Kicker

KS6" x4

KS4x6" x2

CVR12 x2

And I'm looking at swapping from my 98 blazer to a 83 chevy k20. And I just want to get my amps right,

so for the 4x6 they are 30w RMS, 60w PEAK. And I'm looking at the kicker ZX250.2 which gives me 85x2@4ohms.

Now the dumb question cause I forgot. Is that 85W coming out of each channel, or is it 42.5W coming out the channel? Making 85w between the two, in my head it's 42.5W/ch. to get the 85w from both. Is that correct?

Then also, I'm pulling the bench seat out of the truck and installing buckets seats. And making a middle console that's gonna hold two subs, see if this makes sense... One sub facing the back of the truck cab, and one in the front part of the console on a slant so the sub faces the windshield from the floor, so a wedge style box, this angle allows me to put in a armrest above the sub, this box alone with my current measurements, gives me roughly 1.5cuft. That's enough for one sub but I have 2, so could I possibly make up the extra airspace by going around behind the seats. (Think Tetris, the block that was three blocks wide, 2rows, and 1 in the middle of the first row...) so the single block holds the subs, while the three block in the second row holds the airspace required for the 2subs.

____________

|___________|

........| | < bad design, but that the basic shape of my idea, the vertical lines are holding the subs, between the seats, and the rectangle is the airspace behind the seats, if I am able to design the wedge part to be even in airspace I'll divide the box, and have one sub blow to the right, and one blow to the left, (ports) but I think staying in middle and going behind the seats will provide the 3+cuft I need for these subs.

I think this could work, as I have seen a single small 10 in a 40"x12x12, I'm just curious of air flow around corners, I plan on putting eased corners, not 90* corners, so that should helped right?

And then how do you decide where to tune your box what does 40hz have over 32hz, and vise versa. I know how to tune, but I don't know why, when and where. I love hard hitting body shaking, seeing the lights on trees jump up from your vision impaired from the subs vibrating every hair in your noise, ground pounding that you swear you vehicle is about fall apart. Just not sure where my box is tuned, but it sounds phenomenal!! Current set up is 2cvr12 of a mono block alpine MRP-450m, @ 4ohms which I believe is delivering 225W.

Posted

Google is a great tool to use to find the answers to some of your questions. 85 watts per channel at 4 ohms. 125 per channel at 2 ohms. If I read it right you're gonna need another amp for the 4x6's. I couldn't find the specs on your door speakers but I doubt they are 30 watts rms, unless they're kenwood. I think if you explained it right you are only getting 112 watts per sub. As far as box design you should do more research. On box tuning lower tuning plays lower frequencies more efficiently. If you like rap and hip hop tune low. 40 hz is what most prefab boxes come tuned to. Learning how to fiberglass can add a lot of airspace in tight areas. There are a lot of youtube videos teaching you the stuff your asking. Do searches like car audio for beginners, car audio 101, and a really good one is car audio fabrication. I studied for months before I bought my first piece of equipment. If you go to fast your just gonna end up broke buying more stuff than you need to have a system that you're really not happy with.

Posted

As far as research goes, you have no idea how long my bookmark page is for audio, how long I have searched google, and it's not just speakers, it's box design,

Basic audio, beginners guides, watched youtube vids, built my own spl boxes, and fiberglassed, just haven't done it in years, and I'm having issues one detail

And you tell me do more research. I have 900w in speaker power, and 1600 in sub power making a total of 2500W.

I plan on feeding my 4-6 off 42W

My 6" off 125W

And my subs I plan on feeding them 500+ might change From the zx1000.1 to the zx1500.1 not sure.

And IT IS NOT SAYING 85 PER CHANNEL, IT IS SAYING 85Wx2 channel. So since it's by 2, do I divide the 85 between the 2channels.

Here is there spec on the 4x6's

http://www.hifisoundconnection.com/Shop/Control/Product/fp/vpid/5103262/vpcsid/0/SFV/30046. It says right there 60W peak. AND 30RMS.

I have done my research, what I am now asking is if I'm still correct in remembering the way the wattage comes out the amp.

Also I plan in having three amps,

http://www.hifisoundconnection.com/Shop/Control/Product/fp/vpid/5103182/vpcsid/0/SFV/30046 <that one on my kicker KS4x6's

http://www.hifisoundconnection.com/Shop/Control/Product/fp/vpid/3141591/vpcsid/0/SFV/30046 < that one for my 4 kicker KS6's

http://www.hifisoundconnection.com/Shop/Control/Product/fp/vpid/5508793/vpcsid/0/SFV/30046 < that amp for my 2kicker CVR12's

So as far as the amp goes for the 4x6's, WHICH ARE 60W peak, and 30RMS(check the link above), AN AMP WITH 85w x 2CH. If it's 80w/ch, it's to big for my speakers. But if it's 85w split

Between 2 ch, it will give 42.5w/ch, which above the RMS 30w, and below the PEAK OF 60w. This 250.2 zx series amp I think will work just fine, BUT IM NOT WANTING

TO WASTE MY MONEY. SO HERE IS PART OF MY RESEARCH ASKING QUESTIONS, cause someone's video on youtube can't explain what I'm thinking mostly

Cause their not in my head, thinking my thoughts, Is my thinking correct?? Yes or no?.

Posted

Ok first of all, this is all confusing as hell.

Your 250w 2 channel amp will do 85w PER CHANNEL @ 4 ohms, since you like caps lock. So you aren't gonna get 42w unless you ran them at 8 ohms. Which you probably can't, depending on the coil configuration.

Second of all, how did you go from running 250w to your subs and 85 to your 4x6s, to suddenly being a pro and running 2500w? What have you done to your electrical on your vehicle? What vehicle is all of this going in? Do you have an aftermarket battery or alternator? Have you done the big 3? What size wire are you running to all this power?

Thirdly, the amp you are currently running, 400w @ 2 ohms, 220w @ 4ohms, and you are running 2 subs off of one channel, so you are only getting 110w to each sub like dude2800 said. And that's if you you have the subs wired to 4 ohms. What are your coil configurations on the subs? 2 ohm dual or 4 ohm dual?

Lastly, to answer your last question, is your thinking correct? No. If you don't wanna waste money, pay someone to do this for you. Bc since you have tons of "bookmarks" of all the things you know and have learned, and you don't understand how amps work, you probably need to hire a pro. But hey, it's not my money to waste.

sigpic24465_1.jpg

2 - Sundown SA 8V2 | CT Sounds 1400.1 | Pioneer DEH-X8500BS | 4/0 Big 3

Posted

Oh I see, you are rating your system off of peak power capabilities. Lmaoooooo. I think you should run 1600w to those subs. Make a video when you do. Release the magic smoke

sigpic24465_1.jpg

2 - Sundown SA 8V2 | CT Sounds 1400.1 | Pioneer DEH-X8500BS | 4/0 Big 3

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