Get the Ohms right!

[jp56]

so if i have a 2ch 2ohm amp and i have a 4ohm dvc sub and i parallel the sub to bridge the amp that would make the sub 2 ohm and it says that if the amp is bridged it would bring tha amp to 4ohms ? i dont get it would that b ok

[jp56]

so if i run each vc to a dif chan like this
+-+-
+-+- to a 1200 watt amp 2ch it would give me the same effect as bridging my sub to 2ohms and it would stll b able to run 300watt to each vc man i really am confused and its 6.30in the morning and i havent sleeped yet just get back to me if u understand this plz

thank u im a newbe

[Gebrochen]

I'm going to toss out a bit of information because I think there might be a bit of confusion. 'scuse me if I just misunderstood. Subs have 1 or 2 voice coils (a rare few have 4) and the resistance of them is measured in ohms (ok, I think that was obvious). With a dual voice coil, you can either parallel them to divide the resistance of one coil in half, or series them to multiply it by 2. So, a dual 4ohm can be effectively made into a single 2 or single 8 ohm speaker. Amps are rated to operate down to a certain ohm level. You're free to run them at below the rated ohm level if you want to take the risk or know they are of good enough quality to handle it. Lower ohms means you're going to be drawing more current (power) from the amp. Most quality subwoofer amps will handle 2 ohms bridged to a single channel and some will do 1ohm or lower. Cheap ones usually only do 4 before you risk burning them out. So, if your amp is rated for 2ohms bridged, do it.. Wire + to + and - to - on the sub. If it says your amp is rated at 4 ohms bridge you'll either be taking a chance or you'll trigger the protection system and it will automatically shut itself off. ... on the same thought, if your amp is rated at 4 ohm bridged, you'll need a dual 2ohm voice coil or a single 4 to run it at it's specification.

[Ali1]

nice

[jp56]

man im supper confused i have my sub wired up + to + and -to- and that means it would b at 2 ohms right

well this is the amp i got its a cheap one just for starts its a Legacy audio LA790 2ch
and heres the sub i have its an 06/ kicker solo 12" L7 can u tell me the best way to do this

[brad]

Originally Posted by Gebrochen

I'm going to toss out a bit of information because I think there might be a bit of confusion. 'scuse me if I just misunderstood. Subs have 1 or 2 voice coils (a rare few have 4) and the resistance of them is measured in ohms (ok, I think that was obvious). With a dual voice coil, you can either parallel them to divide the resistance of one coil in half, or series them to multiply it by 2. So, a dual 4ohm can be effectively made into a single 2 or single 8 ohm speaker. Amps are rated to operate down to a certain ohm level. You're free to run them at below the rated ohm level if you want to take the risk or know they are of good enough quality to handle it. Lower ohms means you're going to be drawing more current (power) from the amp. Most quality subwoofer amps will handle 2 ohms bridged to a single channel and some will do 1ohm or lower. Cheap ones usually only do 4 before you risk burning them out. So, if your amp is rated for 2ohms bridged, do it.. wire + to + and - to - on the sub. If it says your amp is rated at 4 ohms bridge you'll either be taking a chance or you'll trigger the protection system and it will automatically shut itself off. ... on the same thought, if your amp is rated at 4 ohm bridged, you'll need a dual 2ohm voice coil or a single 4 to run it at it's specification.

ummm... you mean impedance right?? (resistance is the opposition to the flow of direct current )

Originally Posted by jp56

man im supper confused i have my sub wired up + to + and -to- and that means it would b at 2 ohms right

well this is the amp i got its a cheap one just for starts its a Legacy audio LA790 2ch
and heres the sub i have its an 06/ kicker solo 12" L7 can u tell me the best way to do this

i dont wanna re-type whats already been wrote, but if your really stuck, heres a page that just gives you diff wiring combinations for your given type of subs (svc, dvc, etc.) and the nominal impedance of each coil: http://www.the12volt.com/caraudio/wo...igurations.asp

plus they give you a few combinations of using both parralel and series in one circut, which requires more advanced calcalations 8)

[strong4what_matters]

WOW, My computer goes on the crap-tactic on me right after everyone gets confused… ok well after a few months I’m back. And ready to clean up my mess lol. Any new questions I will be sure to answer in very simple terms.

[strong4what_matters]

Originally Posted by pd8731

2/2 does not equal 2. 2/2 equals 1.

He is right, and I just fixed it. My bad, hope I did not mess any one up. but it's good to know people have been reading up.

[pd8731]

Sorry I put that rolling eyes thing in there. That's kind of dickish. I just thought I'd point that out.

[Gebrochen]

ummm... you mean impedance right?? (resistance is the opposition to the flow of direct current Wink)

Most specifications for voice coils are measured in DC resistance as far as I'm aware. Impedance will vary depending on the frequency.

[VikingLax18]

use the rockford fosgate wiring diagram. its great help

[brad]

Originally Posted by Gebrochen

Most specifications for voice coils are measured in DC resistance as far as I'm aware. Impedance will vary depending on the frequency.

DC resistance of the voice coil should actually be lower than the rated impedance of the speaker. ie: 4ohm rated speaker would actually be like 3.3 to 3.8dc

Manufacturers give a "nominal" impedance, example.. if a speaker is rated at 4ohms, thats the nominal impedance where most of the musical spectral power occurs

Although you are right about it changing at diff frequencies

Correct me if Im worng, but thats what Ive read from a few different places

[thechris]

that is correct. the most notable impdance-altering effects are effects due to the moving mass and spring forces from the cone/box/suspension being converted from mechanical energy to electrical energy. this forms the basis for the T/S specs. a port will also affect impedance.

inductance increases impedance as frequency increases, but plays little role with woofers where frequencies are very low and impedance is dominated by the mass/spring mechanical issues.

heat plays a role as well.

[dawgger]

uhhh..... im not a noob or anything but whats sticky???? lol sorry for the dumbass question but i have no clue what that is...


oh btw this is a great topic for people who are new to car audio! good job!

and brad your right, "nominal" impedance is just the average resistance.

[brad]

Originally Posted by dawgger

uhhh..... im not a noob or anything but whats sticky???? lol sorry for the dumbass question but i have no clue what that is...


oh btw this is a great topic for people who are new to car audio! good job!

and brad your right, "nominal" impedance is just the average resistance.

no question is dumb period. a sticky is just a special post thats been chosen to stay at the top of the page because it has correct usefull info that people often ask questions about... its just easier than searching.

nominal impedance is actually the minimum, but i know what you meant

[banging35hzs]

so 2 8ohm DVC will give me a 2 ohm load?

[CerwinVegaHolik]

ok is it pronounced....O.H.M.....or.....Om

[Kay Ot Tek]

Yes 2 8 DVC subs will give you 2. Wire one in parallel and it'll give you a 4 ohm load....if you add another one wired in parallel, it'll be wired to a 2 ohm load.

[banging35hzs]

cool thanks, my boy is geting a couple of 12" pioneer's and a power acoustic amp and the ohm lod is only 2 stable

[banging35hzs]

cool thanks, my boy is geting a couple of 12" pioneer's and a power acoustic amp and the ohm lod is only 2 stable

[Gebrochen]

Originally Posted by CerwinVegaHolik

ok is it pronounced....O.H.M.....or.....Om

Myself and everyone else I know says Ohm like "Home" without the H.

[dirtyg]

can any one tell me what factors cause impendence rise cause if im readin right the port or box size can cause your impendince to drop i.e wire it up as 4 ohm's above mentioned factors drop it to 2 or rise it to 8? if this happens what causes it port,box or freqency?

I'ma newbie too so I gotta question: so if you run an amp to 2 DVC subs you actually divide the ohms by four right for ex. you run an amp to the 4 ohm DVC subs your amps will acutally produce a 1 ohm load (that is if it is capable of doing so)?

[filo-lancer]

i know a fair bit bout audio stuff but im dont get what ohms are all about? im a noob when it comes to ohms...can u please help me,

these are the spec of my amp

4-channnel x 60 watts into 4 ohms
4-channnel x 90 watts into 2 ohms
what does that all mean?

i want to hook up a 1 sub to the 4 channel amp

4 ohm single voice coil sub to it

whats the best way to hook up the sub to the amp?

[filo-lancer]

i know a fair bit bout audio stuff but im dont get what ohms are all about? im a noob when it comes to ohms...can u please help me,

these are the spec of my amp

4-channnel x 60 watts into 4 ohms
4-channnel x 90 watts into 2 ohms
what does that all mean?

i want to hook up a 1 sub to the 4 channel amp

4 ohm single voice coil sub to it

whats the best way to hook up the sub to the amp?