That is correct Long if you go to a 1ohmn load you need an amp that says 800-1000-x1 @1ohmn. I know Rockford's are only rated to go to 2ohmns. Not sure about audiobahns though.

 

see i dont get how you can have a mono amp or a amp with one output and hook multiple speakers to it.

the speakers just evenly distrubite the power? is that how most of its done?

 

Ok here we go someone just had to call my bluff rolleyes.gif . Well there my dear Iceman I think you need to educate yourself alittle more before you start talking reason being they do make a 1000.1 (I'm sorry did in 2001) if you don't beleive me look for yourself www.rockfordfosgate.com or you could even go to www.crutchfeild.com see I am so nice I even gave you links to educate yourself. As far as the other question all three were in one sealed box they were facing up to the window in my 99 Tib I compete in the 2-3 sub modified trunk class all DB drags I participate in are all sanctioned events the meter is the dash mount one with the base on the floor the mic pointed towards the window with a brace on the dash the only one that is cleared to be used at all IASCA and DB drag events. Any other questions I am sorry don't think I was lashing out at everyone just people that think I am using imaginary equipment and Long I am sorry for going postal in your post again my appologies.

 

Yeah Long is pretty confusing if your not use to it. But on most amps there is a switch that will allow you to change the amp to a mono one or not. Are you wanting to run the speaker at a 1ohmn load or a 4ohmn load?

 

Ya i dont know aobut a 150 with 3 12's bein sealed, and were they the Power 1000's or 1000bd's well any ways good luck at any other DB drag shows u goto. BTW i am a certified installer and i know my audio shizit pretty good so hopefully i will c u in the db drag lanes in pro-street 3-4 tongue.gif

 

Long,

Not sure where you got the info about wiring in two 4ohm subs to make a 1ohm load. I am kinda' fuzzy on my Ohm's law theory but I don't think that's exactly right, please correct me if it is. The 12 Volt has some excellent articles about all that kind of stuff.

But I do know that if you wire two 4ohm loads in series, you get a 2 ohm load. I believe that is why JL makes some 6ohm subs (so that you can wire 3 in series and get a 4ohm load, again, please correct me).

In regards to connecting them to your amp, it works like this:

- 1 wire goes out from the mono (bridged) channel of your amp into 1 sub running at 4ohms
- You then run another wire FROM your 1st sub into your 2nd sub. Thus giving you a "series" circuit with a 2ohm load


That is my understanding of how it all works and I've got many friends who have systems setup in this fashion.

Hope this helps!

 

Iceman,

I checked out your DB Drag stats, looks impressive. I don't compete and I don't have the system for it. But I still keeep up on it.

Just curious what this is:



It's in that lil' text box on your DB Drag page. 190 db's?

LOL

And I love the 91000 watts RMS, it's funny how many people actually believe some of this stuff.

Where'd you find the 24inch subs? hehe...

j/k

[ January 10, 2002: Message edited by: 97Accent ]

 

The reason that some many companies are making dual voice coil speakers is that you can cause one speaker to become a 2 ohm load. That is if each individual coil is rated at 4 ohms. When you read up on Ohm’s Law remember that a speaker is (more specifically the voice coil) is a glorified resistor. It is difficult to find it in English but when you wire resistors in series you half the resistance (the ohm load) of the circuit. Therefore to make a speaker with two 4 ohm voice coils into a single 2 ohm resistor do this. Run your wires from your amp to one side of the speaker. Then take and run wires from that side to the other side of the speaker. You now have a 2 ohm load for that one speaker.
Now don’t confuse the wiring of the speaker to the output wiring from your amp. Your speaker does not care whether or not you have your amp bridged down from four channels to one or any other combination.

 

Well, I think you've got series and parallel confused. Resistances wired in series just adds. So 2 4 ohm speakers in series presents a load of 8 ohms.

An example series circuit would be:

Wire comes from the (+) terminal of your amp to the (+) terminal on the first sub. The (-) terminal on that sub is wired to the (+) terminal on the second sub. The (-) terminal on the second sub is wired to the (-) terminal on the amplifier.



Well, close.

Ohm's law for resistance is a bit more complicated...

Rf=1/(1/R1 + 1/R2 + ... + 1/Rn)

So if you apply that formula for a pair of 4 ohm loads, you get 1/(1/4 + 1/4) = 2 ohms.

Just for clarity, an example parallel circuit would be:

Wire comes from the (+) terminal at the amplifier to the (+) terminal of BOTH subs, and a wire from the (-) terminal of the amplifier goes to the (-) terminal of BOTH subs.

In the case of DVC 3 ohm voice coils, you can use 3 of those to present a 1 ohm load 2 ohm load or a 4 ohm load, or stereo 1 or 2 ohm loads.

If you wire each sub in series (3 6 ohm loads) then run all three in parallel, you get a 2 ohm load. (1/(1/6 + 1/6 + 1/6)) Alternately, you can wire voice coil #1 from all three subs in parallel, and voice coil #2 from all three subs in parallel (1/(1/3 + 1/3 + 1/3)) for a pair of 1 ohm loads, then withe those in series for a single 2 ohm load.

Or, if you want to run a pair of 2 ohm loads (Stereo,) you can wire 2 subs in series, and then run each one in parallel with 1 voice coil on the third sub. (1/(1/6 + 1/3))

For a single 4 ohm load, wire as for a pair of 2 ohm loads, and put those in series.

If your amplifier can handle a 1 ohm load, wire as for a pair of 2 ohm loads, and put those in parallel.

And of course, if you have one of those amplifiers that can deal with really low impedances, just throw the whole works in parallel, and give me some of that money that you have to burn. (Nominal Resistance should be 0.5 ohms = 1/(1/3 + 1/3 + 1/3 + 1/3 + 1/3 + 1/3) )

So basically, the 3 ohm DVC subs are aimed at versatility with 3 subwoofer systems. 6 ohm subs, single voice coil subs are also pretty much aimed at this kind of configuration.

Anyway, you tailor the subwoofer configuration for what the amplifier can handle. If your amp can only handle 4 ohm mono loads, then you set up your subs to give it that. If you can handle 2 or even 1 ohm loads, then you wire your subs accordingly, and reap the benefits of increased power.

[ January 10, 2002: Message edited by: Dan ]

 

ok here we go..... im confused and yall are making me even more confused.

i have 2 12" w3 d4 subs. per jl audio site.. http://www.jlaudio.com/subwoofers/12w3.html
if you click on db monster or any of the boxes at the bottome (must have adobe acrobat) then you can see they provide a wiring diagram.

per there info. if i have two 4ohm subs. i can wire it make a 1ohm load or a 4ohm load. im not guessing and i dont know. im just saying what jl said. ok. so with that...

which would be better? a 1ohm or 4ohm? rockford is rated at 2ohm load. so that wouldnt work well. unless i got more subs to make it a 2 ohm load.

im not worried about how to wire it because im going with what jl says. say what the maker says! anyways. what type of amp should i get. im not going audiobahn any longer. rockford wont work. anyone else have ideas?

and if you look at the diagram you see its only two wires out. so i need a mono amp?


ok i just checked the rockford site and it says i can bridge the 800.2 amp to get
400w x 1 @ 4ohm rms. so if i bridge the amp i can get 4 ohms to match my setup right. how do i bridge it.

[ January 10, 2002: Message edited by: long ]