Porting current box
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Postmaster
Joined: Dec 2007
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From: Jacksonville FL
Porting current box
I originally made this box thinking I would be getting another cvr12" sub but turns out I cant afford it right now. So I was thinking I would port it to get some more bass. How would I port it? Just buy a round port drill a hole in the box and stick it in? If so where would be best to put the port and what size port should I get?
Here is the box I made. It is my 1st box ive ever made so I know its not good.
its 50" long 15" tall 8.5" bottom depth and 6" top depth.
Here is the box I made. It is my 1st box ive ever made so I know its not good.
its 50" long 15" tall 8.5" bottom depth and 6" top depth.
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Postmaster
Joined: Dec 2007
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From: Jacksonville FL
The only reason I dont want to get another 12 and the 750.1 amp is because I was told I would have to add another battery bigger alternator and a cap. Is that true? If I can keep all my electrical system the same I will get the new amp and another 12.
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Joined: Oct 2006
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From: youngstown, ohio
your not adding that much strain to your electrical system. i have a 4000 watt amp and i dont need a new alt, new battery, or a cap. and im runnning it to 4 subs in my standard cab truck! the lights dont dim unless you practically crank it up to the max
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Postmaster
Joined: Dec 2007
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From: Jacksonville FL
Thanks. Should I go with 4 gauge or 2? The amp will be putting out right under 1000rms.
Also does this sound like a good setup? Or should I look into something else?
Am I going to see a big difference adding another 12?
Also does this sound like a good setup? Or should I look into something else?
Am I going to see a big difference adding another 12?
Elder User
Joined: Jan 2004
Posts: 763
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From: Rio Linda, Ca
I would do 1/0 then you won't have to worry weather it's enough or not for a long time.
You could see quite an increase in loudness, if the subs are correct in their box.
More Turbo
Joined: Aug 2007
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From: Washington state
Not to be an ***, but you aren't running a 4000 Watt amp. I state this just because your running under the false pretense that your electrical system is keeping up with a 4000 Watt amp.
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More Turbo
Joined: Aug 2007
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From: Washington state
Is this internal or external measurements, and what thickness material did you use. Which CVR 12" do you have DVC 2 or 4 Ohm? I can see if my Boxpro has that sub in my database and I can run through some port lengths.
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Postmaster
Joined: Dec 2007
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From: Jacksonville FL
Thanks!
Senior User
Joined: Oct 2006
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From: youngstown, ohio
the 4000 watt amp is not running at a full 4000 watts, its a two channel amp of course its not.. i was just stating that i have a 4000 watt amp in my truck that i use without the lights dimming when its cranked up. i surely wouldnt say "hey im running a 200 rms amp x2 @ 2 ohms. no, i say 4000 watt because thats what the damn thing is at max power before going into self destruct mode.
Elder User
Joined: Jan 2004
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From: Rio Linda, Ca
What Don S. is saying is that there very few amps now a days that actually put out their rated power.
Many times people will say I have an amp that puts out this, when in fact its more of a box of rocks then a power producer.
I call most amps max rating the "ALS" rating, or As lightning Strikes
You can do a general power measurement bt taking a DMM and setting it to AC,measure the peak number. times it by it's self then devide it by the ohm load.
AC X AC / ohm load
It's not perfect as the ohm load will change as the drivers move, however it will give you an idea of what your amp is producing
Many times people will say I have an amp that puts out this, when in fact its more of a box of rocks then a power producer.
I call most amps max rating the "ALS" rating, or As lightning Strikes
You can do a general power measurement bt taking a DMM and setting it to AC,measure the peak number. times it by it's self then devide it by the ohm load.
AC X AC / ohm load
It's not perfect as the ohm load will change as the drivers move, however it will give you an idea of what your amp is producing
More Turbo
Joined: Aug 2007
Posts: 555
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From: Washington state
the 4000 watt amp is not running at a full 4000 watts, its a two channel amp of course its not.. i was just stating that i have a 4000 watt amp in my truck that i use without the lights dimming when its cranked up. i surely wouldnt say "hey im running a 200 rms amp x2 @ 2 ohms. no, i say 4000 watt because thats what the damn thing is at max power before going into self destruct mode.
Please realize that that rating will never be attained. I run a 1000 RMS watt setup, yellow top battery, and a 90A alternator. My lights dim slightly. If you believe the amp can attain 4000W then, then I ask how you can make 4000Watts with only a single 30A fuse for amp protection. Even at a 200% rating draw on the amp. 60A x 14.4 Equals 864 watts of input power. And seeing that it is a class A/B amp it's efficency could be any where from 35% to 55% efficent at the most. That would mean that the amp would require 7300 Watts of input power to produce 4000W.
The fact remains MAx watts, andpeak watts means absolutly nothing other than sales to audio manufactures. RMS wattage is the actual wattage you need to consider. Trust me on this one here as a past SPL competitor, and car audio hobbiest for the last 17 years.
78'fordtruckguy i am not saying that your amp won't work, and it will make sound, and honestly properly installed it will get loud, just I am pointing out that telling someone you have a 4000 watt amp and your electrical system is just fine is just not right.
More Turbo
Joined: Aug 2007
Posts: 555
Likes: 2
From: Washington state
Please realize that that rating will never be attained. I run a 1000 RMS watt setup, yellow top battery, and a 90A alternator. My lights dim slightly. If you believe the amp can attain 4000W then, then I ask how you can make 4000Watts with only a single 30A fuse for amp protection. Even at a 200% rating draw on the amp. 60A x 14.4 Equals 864 watts of input power. And seeing that it is a class A/B amp it's efficency could be any where from 35% to 55% efficent at the most. That would mean that the amp would require 7300 Watts of input power to produce 4000W.
The fact remains MAx watts, andpeak watts means absolutly nothing other than sales to audio manufactures. RMS wattage is the actual wattage you need to consider. Trust me on this one here as a past SPL competitor, and car audio hobbiest for the last 17 years.
78'fordtruckguy i am not saying that your amp won't work, and it will make sound, and honestly properly installed it will get loud, just I am pointing out that telling someone you have a 4000 watt amp and your electrical system is just fine is just not right.
The fact remains MAx watts, andpeak watts means absolutly nothing other than sales to audio manufactures. RMS wattage is the actual wattage you need to consider. Trust me on this one here as a past SPL competitor, and car audio hobbiest for the last 17 years.
78'fordtruckguy i am not saying that your amp won't work, and it will make sound, and honestly properly installed it will get loud, just I am pointing out that telling someone you have a 4000 watt amp and your electrical system is just fine is just not right.