quick ohm question...????

[wickedwitt 10+ year member]

Really don't care if he's trolling, but here's the math anyways. Paralell 2 4ohm SVC= 1 4ohm DVC= 4/2=2 Series= 4+4=8

When wiring parallel, you take ohm load of one coil, and divide it by the number of coils in the equation, ergo: 3 40hm SVC= 4/3= 1.3~ Wired Series it would be 4+4+4=12

 

[Kangaroux 5,000+ posts]

Really don't care if he's trolling, but here's the math anyways. Paralell 2 4ohm SVC= 1 4ohm DVC= 4/2=2 Series= 4+4=8 When wiring parallel, you take ohm load of one coil, and divide it by the number of coils in the equation, ergo: 3 40hm SVC= 4/3= 1.3~ Wired Series it would be 4+4+4=12

not trollin bro. im new to this shit and that impedance question has been bugging the crap outta me. thanks for clarification

 

[ChevyRidinLow]

but you probably do not have a dual 3 ohm sub. Just because you measured that with your DMM doesn't mean it's 3 ohms. Subwoofers are rated in impedence which is AC. Your DMM measures Resistance which is DC. The two measurements are different. Just because they are both rated in ohms does not mean anything.

annd..the impedence isnt on the dot of what it is rated at thats kinda just a rounded number but yeah 6 and 1.5 if it is dual 3...i dont like these oddities

 

[d2k 10+ year member]

thx all....... i dont troll, i just dont know that much!!

here's the situation..... i recived my DMX15 (quad 1ohm) & the guy had hacked off 4 of the 8 terminals & bridged 2 of the coils together, creating a D2 not a Q1.

i thought it was 3ohm each but taking resistance into account they actually make 2ohm a piece...

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now this pissed me off a bit, but the guy said this mod was made to help keep the signal path clearer....???

has anyone seen this done before..... does it affect how the coils are powered..??

 

[d2k 10+ year member]

anyone..??

 

[09civic 5,000+ posts]

Sounds sketchy...

 

[dragonrage 10+ year member]

anyone..??

While it is arguably better/easier for an amplifier to drive a higher impedance load, it's not an issue with any well-designed amp. And it's something you could have wired yourself. So all he did was take away flexibility. That said, I don't really think that quad coils are necessary...

By the way... Impedance is not the same as resistance... a multimeter is going to pretty much measure Re, not impedance. Impedance is made up of resistance and reactance (think of resistance and reactance as the "straight" sides of a right triangle with the impedance being the hypotenuse). Reactance comes from capacitors and inductors (like a voice coil) and varies with frequency. Impedance thus varies with frequency.

 

[d2k 10+ year member]

While it is arguably better/easier for an amplifier to drive a higher impedance load, it's not an issue with any well-designed amp. And it's something you could have wired yourself. So all he did was take away flexibility. That said, I don't really think that quad coils are necessary...
By the way... Impedance is not the same as resistance... a multimeter is going to pretty much measure Re, not impedance. Impedance is made up of resistance and reactance (think of resistance and reactance as the "straight" sides of a right triangle with the impedance being the hypotenuse). Reactance comes from capacitors and inductors (like a voice coil) and varies with frequency. Impedance thus varies with frequency.

thanks......//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

but does wiring the coils like this affect the way it runs..??, b/c in order to get 1ohm im running all the positives together.... & all negatives together, but you can see he's actually bridged the +/- together and soldered them..???

will that not change polarity somewhere along the line..??

 

[dragonrage 10+ year member]

He just put them in series. You can regard the speaker as a D2 for all intents and purposes. You can use it in parallel which would be like a series-parallel connection on the speaker, which is fine, or you can use them in series (for 4 ohms) which would be the same as series with the quad coils.

 

[d2k 10+ year member]

top man........