heres how to make 2 D4's, run @ 2 ohm...

[mgaidica 10+ year member]

well i made a post about "jumping voice coils" a while back, and finally got to calling circuit city today to ask about it. This is what they said...

http://gallery.caraudio.com/pp/showphoto.php?photo=1079

I know on my amp although its mono it has 4 terminals, or 2 channels. So basically that diagram was wiring 2 Dual 4 ohm coils, to a 2 ohm amp load. Please comment...

Click to read more...

 

[avistar23 10+ year member]

it looks like they just wired every thing in parallel.....

 

[mgaidica 10+ year member]

yeh, it all makes sense, except im not familiar with the way the amp works using that 2 channel thing. Obviously its not running 1200 watts per channel, cause then it would be a 2400 watt amp, not 1200.

 

[ngsm13 5,000+ posts]

Originally posted by mgaidica yeh, it all makes sense, except im not familiar with the way the amp works using that 2 channel thing. Obviously its not running 1200 watts per channel, cause then it would be a 2400 watt amp, not 1200.

well, if u do this with your 1200.1....even though it has four speaker inputs (or 2 sets) the amp is internally bridged. SO, it will still be a 1ohm load. peace

NG

 

[HUDI 10+ year member]

it look parrel to me what sort i dont know it not series parrel ??what amp u got the crossfire vr when wired like that daul 4 ohm voic coil the amp will see them as 1ohm sounds weard but that what they say (i have thm working like that ) but i have seriesparrel on 1 side of sub hook the+ to the - the other side su from that +&- to ur amp

 

[fantomas 10+ year member]

i had the same problem with my mtx 81000d. it has 2 channels but its not 1 ohm stable. but ive been running 2 4 ohm dvc subs i guess at 1 ohm and its been fine....but shuts off when i do a sine sweep @ about 40 hz...probably gets too hot? i didnt have a very good air circulation. oh well.

 

[mgaidica 10+ year member]

my friend has the mtx 8100D, and he's the one doing this... i dunno..

 

[MikeofTulsa Moderator]

click on the link below for wiring help in my sig......will teach u alot about wiring...enjoy

 

[fantomas 10+ year member]

Originally posted by mgaidica my friend has the mtx 8100D, and he's the one doing this... i dunno..

is that the amp you asked about? the 81000D? do all mono amps have two channels? ive actually been wondering about this for a while...but its ok to run 2 dvc 4 ohm subs on that amp? ideally it would be 1 ohm (1/4+1/4+1/4+1/4 = 1) but technically theres two channels...so it might be actually seeing 2 ohms x 2 channels and 750 watts x 2. !?@?!$? //content.invisioncic.com/y282845/emoticons/furious.gif.fc81ca146dbff91fede3ed290dbc4f4c.gif//content.invisioncic.com/y282845/emoticons/mad.gif.c18f003ab0ef8a0d9c27ca78d77a6392.gif//content.invisioncic.com/y282845/emoticons/banghead.gif.8606515f668c74f6de0281deb475b6fd.gif :banghead:

 

[Wonderbread 5,000+ posts]

the reason it shuts down oin sine sweps is that as you play a sine wave... the impedance on teh coil drops... it is dropping significantly below 1 ohm... that's causing the trouble..

 

[fantomas 10+ year member]

Originally posted by Wonderbread the reason it shuts down oin sine sweps is that as you play a sine wave... the impedance on teh coil drops... it is dropping significantly below 1 ohm... that's causing the trouble..

ahh...true true..but they sure are fun.

i played one with me in the the driver's seat, my friend in the passenger seat, and my friend's girlfriend in the back seat....i think i made her 'moisten' herself lol. //content.invisioncic.com/y282845/emoticons/eek.gif.771b7a90cf45cabdc554ff1121c21c4a.gif//content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif

 

[paikiah 5,000+ posts]

Originally posted by fantomas is that the amp you asked about? the 81000D? do all mono amps have two channels? ive actually been wondering about this for a while...but its ok to run 2 dvc 4 ohm subs on that amp? ideally it would be 1 ohm (1/4+1/4+1/4+1/4 = 1) but technically theres two channels...so it might be actually seeing 2 ohms x 2 channels and 750 watts x 2. !?@?!$? //content.invisioncic.com/y282845/emoticons/furious.gif.fc81ca146dbff91fede3ed290dbc4f4c.gif//content.invisioncic.com/y282845/emoticons/mad.gif.c18f003ab0ef8a0d9c27ca78d77a6392.gif//content.invisioncic.com/y282845/emoticons/banghead.gif.8606515f668c74f6de0281deb475b6fd.gif :banghead:

surely you mean two sets of inputs?

mono should be mono... 1 channel... they are there to ease installation,so you don't have to cram in wires. The two sets of terminals supposedly lead to the same points of the circuitry board.

 

[fantomas 10+ year member]

Originally posted by paikiah surely you mean two sets of inputs?

 

mono should be mono... 1 channel... they are there to ease installation,so you don't have to cram in wires. The two sets of terminals supposedly lead to the same points of the circuitry board.

it has one pair of inputs(l+r) , one pair of pre amp outputs(l+r), and two sets of sub terminals...im sure the amp can handle it...and with the new box imbuilding..the ventalation system will be more than adequete (14 intake fans and 14 exhaust fans)

 

[paikiah 5,000+ posts]

Originally posted by fantomas it has one pair of inputs(l+r) , one pair of pre amp outputs(l+r), and two sets of sub terminals...im sure the amp can handle it...and with the new box imbuilding..the ventalation system will be more than adequete (14 intake fans and 14 exhaust fans)

14 pairs of fans???? //content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif what are you trying to do?

a pair of 80mm push-pull fans should be enough, don't you think?

 

[n2audio 5,000+ posts]

It's not 2 seperate channels - if you were to open up the amp you'd see that just inside the amp those terminals are actually the the same output - they're parallel to each other. If you hook a 4 ohm load to each sub terminal on the amp the amp sees 2 ohms.

That diagram you posted is a series/parallel configuration. On each sub the voice coils are in series - resulting in a pair of 8 ohm loads, and the subs are paralell at the amp which would be a 4 ohm final load.

To get 1200 watts from the JBL you need to go parallel/parallel. On each sub just hook the pos's together and the neg's together with a "jumper" wire. That will make each sub 2 ohms - then just connect one vc from each sub to the amp. You'll have a 1 ohm load on the amp and you'll be getting full power from it.