need some help with either hu or amp.

[trunks9_us 10+ year member]

Ok first of all i used to run a zapco reference 1100.1 on a treo ssi 12 ported

Now i run a zapco 9.0 on 3 jbl wgti12's sealed

The 1100.1 does 1100 rms at 2 ohms and thats what i was running on the treo ssi

the zapco 9.0 i have is a 4ohm at 2200 rms and i got 3 jbl running on a 4 ohm load.

Now heres the problem why does the reference sound louder for one? shouldnt the 9.0 be making my car way louder?

question 2 now i am having a problem with either my amp of hu. Seems to be the problem is when i turn up the hu at a certain point the amp goes into protection mode regradless where i have the gain set if i have it set at 2db or 20 db it still cuts off. each song makes it go in proection mode at different volumes. my kenwood can go up to 35 it usally goes into protection mode btw 25-30 depending on song. Now i tried turning the subwoofer down on the hu but then i can just turn up thevolume it kinda work a lil better but the amp still seems to shut off? So even when i have the gain at 2db it will shut off at 30 on volume and its not even that loud either. can i get somehelp plz.

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[69420potsmoker 10+ year member]

It could be alot of things but I would first check the wiring at the subs and make sure everything is in good shape.

I had a amp doing the exact same thing at a certain volume point and it ended up being a bad connection at the speaker terminal that shorted out when enough air was moving.

 

[trunks9_us 10+ year member]

well i dont think it can be that cause i alrdy checked that then i got a socket head and tighented them all up.

 

[envengineer 10+ year member]

How do you have the gtis wired up.

To get a 4 ohm final load you need to have the terminal jumpers removed so you can wire the coils in series and then the subs in parallel. Just checking to make sure you don't present a low load to the amp. The gtis are a little different in their wiring configuration than most subs.

 

[trunks9_us 10+ year member]

los and confused on what your saying make me a pic.

and the ppl who made the box did it but i looked at it last night and its like the did it how you would from

http://www.the12volt.com/caraudio/woofer_configurations.asp~Q~3~I~62

ubt it looks like the just solder all the wirtes together instead of putting multiple wires in the voice coils.

How do you have the gtis wired up.
To get a 4 ohm final load you need to have the terminal jumpers removed so you can wire the coils in series and then the subs in parallel. Just checking to make sure you don't present a low load to the amp. The gtis are a little different in their wiring configuration than most subs.

 

[envengineer 10+ year member]

From the manual available @ http://manuals.harman.com/JBL/CAR/Owner's%20Manual/GTi%20MkII%20Sub%20OM%2005.pdf

Note: Unlike conventional DVC

subwoofers, the two sets of terminals

are configured so that both positive (+)

terminals are on one side of the frame

and both negative (–) terminals are on

the other side. GTi Series subwoofers

are shipped with terminal jumpers

installed which configure the two 6-ohm

voice coils in parallel for a 3-ohm load.

Look at figures 6 and 8. Figure 6 shows how the jumpers need to be removed to wire the coils in series, and figure 8 shows how to wire the 3 subs in parallel with the coils in series in order to have a 4 ohm final load. You want each sub to present a 12 ohm load since you have 3.

The jumpers are just those little gold plates that bridge the terminals.

 

[trunks9_us 10+ year member]

ok i found those gold little plates but i need to run a 4ohm load and not a 12ohm load i guess maybe this is why this is happening.

From the manual available @ http://manuals.harman.com/JBL/CAR/Owner's%20Manual/GTi%20MkII%20Sub%20OM%2005.pdfNote: Unlike conventional DVC

subwoofers, the two sets of terminals

are configured so that both positive (+)

terminals are on one side of the frame

and both negative (–) terminals are on

the other side. GTi Series subwoofers

are shipped with terminal jumpers

installed which configure the two 6-ohm

voice coils in parallel for a 3-ohm load.

Look at figures 6 and 8. Figure 6 shows how the jumpers need to be removed to wire the coils in series, and figure 8 shows how to wire the 3 subs in parallel with the coils in series in order to have a 4 ohm final load. You want each sub to present a 12 ohm load since you have 3.

The jumpers are just those little gold plates that bridge the terminals.

 

[envengineer 10+ year member]

ok i found those gold little plates but i need to run a 4ohm load and not a 12ohm load i guess maybe this is why this is happening.

You need 12 ohms per sub. So you want the voice coils in series. The plates put the coils in parallel.

Take the plates out. Wire each sub up so the voice coils are in series, like Figure 6. Then you can parallel them by either running several wires back the amp (3+ and 3-) or you can jumper from sub to sub.

12 ohms per sub across 3 subs will give you a 4 ohm load.

High impedance will never cause your amp to stop, it will only reduce power and therefor output. Driving high power at low impedance will toast your amp if it is not rated at the lower impedance.

PS: If you parallel the coils, and put all the subs in series, you will end up with 9 ohms, which is not what you want either. You can not use those gold plates and get to a 4 ohm impedance with three subs.

 

[trunks9_us 10+ year member]

called my dealers and he took didnt install them and he explained it to me also i think i am going to be checking voice coils.

You need 12 ohms per sub. So you want the voice coils in series. The plates put the coils in parallel.
Take the plates out. Wire each sub up so the voice coils are in series, like Figure 6. Then you can parallel them by either running several wires back the amp (3+ and 3-) or you can jumper from sub to sub.

12 ohms per sub across 3 subs will give you a 4 ohm load.

High impedance will never cause your amp to stop, it will only reduce power and therefor output. Driving high power at low impedance will toast your amp if it is not rated at the lower impedance.

PS: If you parallel the coils, and put all the subs in series, you will end up with 9 ohms, which is not what you want either. You can not use those gold plates and get to a 4 ohm impedance with three subs.

 

[trunks9_us 10+ year member]

well never got to the voice coils but i did figure out the problem!

Turns out that i was using 0 gauge to my amp but only 2 gauge fit in it so i cut some off which was bad and i was using 4 gauge for ground so i took somr distro blocks for both of them and put the 0 gauge in on hot and ground and then ran 2 gauge to hot and gnd on the amp and now it bangs hard thats why it was going into protect mode cause it could not get enough juice to it. But problem is solved and i am very happy with my zapco 9.0. How ever i would like to rat the jbl w12gti subs i like them but i was very dissappointed that they can not take my 9.0 at full power //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif. How ever i do not it can take a beating. Thx for help everyone.

 

[envengineer 10+ year member]

In a proper enclosure, the 3 w12gtis can take ever last bit of the power you have available and more.