ryan_green1337

Im somewhat of a noob when it comes to car audio but i have a cheap 1000 watt interfire 2 channel amp that ive had for about 2 years now, and a recently installed 12" kicker CVX. I had 2 12" kicker comps installed, one sub per channel. When i hooked up my cvx i put it into bridged mode. It started to play just fine, but i went to turn up the head unit and the fuses blew. theyre 20amp rated fuses and im POSITIVE that all my power and grounding wiring is alright because the prior comp setup ran like a champ. any ideas?

djfrestyl

iTrader: (89)

The fuses on the amp? Are you sure you wired the subs correctly with the right impedance?

http://www.crutchfield.com/S-crzddPP...rs_wiring.html

ryan_green1337

yea, the amp fuses blew. i didnt do the wiring on the sub myself, it was a loaded enclosure so it could be that but it said it was ready for a 2 or 4 ohm load. when the amp is bridged is it not a 2 or 4 ohm load?

djfrestyl

iTrader: (89)

"Ready for a 2 or 4ohm load" - no such thing. It's either 2 or 4, and that needs to be identified so that you can properly wire it in accordance to the specs of the amp.

ryan_green1337

fair enough, well lemme pop the sub out of the box and see how its wired.

ryan_green1337

the subwoofer is wired for 2ohm, i replaced the fuses and im running the cvx on only one channel instead of bridged but id rather it be bridged.

importcf

the amp might not be able to go down to 2 ohm. is it DVC (Dual voice coil). ide also check your ground and maybe even make sure the right fuse is in the amp.

ryan_green1337

it is dual voice coil and the ground is perfect. im not sure which type of fuse is supposed to go in. the amp is an older model so its not on the manufacturers website so i cant check which fuse is supposed to work. i have 2 20amp fuses in it currently but i called the local audio shop that carries it and he says that it can handle 2 30 amp fuses but im scared to put them in because im not trying to blow up anything lol

djfrestyl

iTrader: (89)

Dual voice coil - and each coil is how many ohm? I'd take a look at the Crutchfield link, and I'd DEFINITELY open up that box to see how the sub itself is wired.

ryan_green1337

im not sure how many ohms per coil and i cant really make sense of the crutchfield link because the 2 channel bridged pictures are the same no matter the ohm rating

importcf

how bout some sub model numbers and amp model numbers that should help. ide check the wiring of the voice coil wiring 1st and then possibly change fuses 20amp seems low but i might be wrong. these fuses are on the amp correct not on the power wire? what gauge wire for power and ground? what are you grounded to? just fig ide ask all this so we can eliminate any possible problems

ryan_green1337

i thought 20amp fuses seemed low, and yes the fuses are on the amp, not the power line. i dont remember what gauge wire but its about the thickness of the face of a penny. im grounded properly and all the wires power and ground wires are installed correctly, remember i had a system prior to this that was NOT bridged. i had 2 kicker comps (one on each channel).

here's the sub
http://kicker.com/comp_vx

and for the amp...uuuh about that lol. i cant find anything ANYWHERE about this amplifier. this is the newer model of my amp, but not the amp i have.

http://interfireaudio.com/ampsAB.html (its the 2.1000 one)

importcf

sounds like 0ga. ok so looks like the new model goes down to 4ohms stable. these subs come with either 4ohm voice coils or 2ohm and this is kinda key for setting up the wiring. you very well could be dipping too low for this amp see if u can get a full model number like my JL is 10w3 d6 for dual 6 ohm voice coils. let me know and i can show you how to wire up for a 4 ohm load if it isnt already that way. I am also assuming the wouldnt lower the handling cababilities on the new model

ryan_green1337

ok sounds good, ill have to do it tomorrow though because i have to go in for work. first thing in the morning. thanks for all your help

djfrestyl

iTrader: (89)

Then you're not reading it right. It tells you how to wire the sub to achieve the correct impedance, not which terminals to connect to the amp. You have to determine how low your amp can go, and then pick the right setup of the SUB to get there.

ryan_green1337

ok so i took the sub out of the enclosure today and saw that the two negative terminals were connected together and the positive coils were connected together. thats the best i can describe it, sorry if its difficult to understand

Calcvictim

if the positive and the negative are connected together that means it's wired in parallel

1)figure out what is the impedance of each coil, should be on the sub itself
2)divide the impedance by half because the 2 coils are wired in parallel
for example if each coil is 4ohm, the resulting impedance of the sub as a whole the way it's wired is 2 ohm
3)find out if the total impedance is less then what the amp is stable at, most amps should be able to handle 2 ohm loads but probably not 1 ohm loads

4)bridging is done when you have 2 amplifiers powering the same speakers, what it effectively does is make both act as a single amp and the power of both is combined(Captain Planet baby)

because you only have one amplifier no bridging should be happening

djfrestyl

iTrader: (89)

Do you own a multimeter? Need to know what impedance each of the voice coils are on the sub. You're making this overly complicated.

djfrestyl

iTrader: (89)

Based on your info, you're using one of the two configurations:
http://akamaipix.crutchfield.com/ca/...4-ohm_mono.jpg
http://akamaipix.crutchfield.com/ca/...2-ohm_mono.jpg

All we need to know is the impedance of the voice coils.

ryan_green1337

its 2 ohm impedance

ryan_green1337

its 2 ohm and wired like the first link

Calcvictim

ok, what is your amp specs, is it a single channel or a 2 channel amp

ryan_green1337

2 channel

ryan_green1337

i was told if i plugged the subwoofer into the 2 outer speaker ports on the amp that it would "bridge" the amp and put the full power of the amp into the one subwoofer. is this correct or bs?

Calcvictim

it looks like you have an amp similar to this one, everything I say will rely on these specs
http://www.interfireaudio.com/ampsHighCurrent.html

1)the amp is not bridgeable running in 1 ohm(which is what your sub is wired to be)
2)it does work in 1 ohm mono, which means you should be able to connect it to your sub fine

3)un-bridge the amp and it should work fine



the way to bridge an amp is to connect one channel positive to the second channel negative and use the unocupied terminal for the speaker/sub

ryan_green1337

ya i have it unbridged right now, is there a way that i can wire my subwoofer in a way so i can hook it up to my amp bridged?

importcf

your amp is not stable at one ohm so u need a new sub or an amp there kinda not computable. you can prob run it but it will beat on the amp

importcf

try to wire like this http://akamaipix.crutchfield.com/ca/...2-ohm_mono.jpg then bridge

Calcvictim

he will lose power if he wires it that way, if his amp is 2 ohm stable which it is it doesn't make sense to wire it into 4 ohms



I am guessing you want the most power out of the sub, if that is the case then you want to wire each coil seperately to each one of the channels

looking at the specs on the website you can wire the sub and amp 2 ways

way 1)2 coils are wired in series as importcf suggested, resulting in your sub having one 4 ohm load, then you can bridge the 2 channels and in result you have 250 watts of power
way 2)seperately wire each coil to each channel and you have 2 2ohm loads, which give you 2 channels at 200 watts each


I would choose way2

ryan_green1337

well the amp is old anyways so i was planning on replacing that anyways. so all i need is a mono amp that can handle a 1ohm load?

djfrestyl

iTrader: (89)

Yep. You have dual 2ohm VC's, so you can wire it down to 1ohm.

ryan_green1337

sweet, thanks for all your help guys. definately learned a lot. sorry im such a slow learner. does anyone have a recommendation for an amp? no more than 750 watt rms and has to be able to handle a 1ohm load. not sure what my budget is but im not trying to fork over a leg or anything.

Calcvictim

just my opinion but the sub does not need the most fidelity, get something that is reputable but not too expensive. you do not need necessarily 750 watts RMS, something less powerful will suffice also

I would probably get something like this, cheap, reliable and efficient
http://cgi.ebay.com/2009-KENWOOD-KAC...1|293:1|294:50

Pearl96Max

iTrader: (151)

Earlier you said that the enclosure is 'ready' for either 2 or 4Ohm correct ? You later found that it is wired for 2Ohm leading to believe that you have dual 4Ohm coils. If the amp is shutting down, then chances are quite good that it cannot handle a 2Ohm mono load. Not sure where Any of this 1Ohm load stuff came from ..

Also quite confused how anything can be 'ready as 2 or 4 ' unless referring to the enclosure itself and having a different model sub in it at ship time. With a dual coil driver it is im possible to achieve 2 or 4. 2 or 8 - yes, 1 or 4 - yes. It is either going to essentially double or be cut in half from the root.

Pearl96Max

iTrader: (151)

What ?!?!?!


Did you just suggest he connect two outputs to each other ?

ryan_green1337

looks good for the price but it says that the 1 ohm load will provide 900 watts. is that max watts or rms? 900 is too high for just one cvx

Pearl96Max

iTrader: (151)

So your back to being 1Ohm ? Is final impedance 1 or 2 ??

If 1, then simply wire it in series for 4.

choray911

iTrader: (1)

This chart does not apply to OPs situation, completely disregard. Traditional amps are not 2 ohm stable bridged. When you bridge the amp the left and right outputs are combined internally and the impedence is cut in half. The maximum load that can be bridged is 4 ohms, which internally is 2 ohms when the left and right channels are combined. If you were to put a 2 ohm load bridged on the amp, it would really see a 1 ohm internal resistance, which would cause the power supplies pull more current, thus blowing fuses.

With your set up there is no power difference between a 2ohm stereo connection and a 4 ohm bridged connection. The amp will produce the same amount of power either way.

Calcvictim

I was unaware that the amp was a 2 channel amp, so I said no bridging should be done.


Amps are bridged by connecting the possitive lead of one channel to the negative of another channel and using the remaining leads to connect the speaker.


an instructions manual for a JL Audio amp is here, if you want to verify
http://safemanuals.com/user-guide-in...AUDIO/300-2-_E

Pearl96Max

iTrader: (151)

Taken directly from the exact manual you sent:

To bridge a pair of channels, use the
“Left +” and “Right –” speaker connectors
only (the “Left –” and “Right +” remain unused).

Please, for your own safety do not try your theory. Perhaps you misunderstood what you were reading, so please do not try it. You should Not be connecting the amplifier to itself.