Question about JBL GTO1202D Car Subwoofer

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Wiering up my subs

I have 2x jbl gto1202ds ive bin told my amp is 4 ohms and i need to wier up my subs changing them from 2 ohms to 4 ohms???? ben

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  • Christopher Renner
    Christopher Renner May 11, 2010

    What's the model number of your amp?

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JBL

Posted on Mar 09, 2008

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Two dual 2 ohm subs cannot be wired in 4 ohms. The only option for you to run those subs off a 4 ohms amp is to wire them in 8 ohms. You will need to wire all the voice coils in series to get 8 ohm load which of course is not recommended. changing your amp is the best solutions here. try to get a 2 ohm stable mono.

Posted on Dec 27, 2008

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Posted on Jan 02, 2017

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What is the best way to wire two kicker comp r 12' s to a two channel amp for max bass?


First, you need to know whether you have the 2 ohm DVC subs or 4 ohm DVC subs. Second, you need to know the minimum impedance the amp can handle (most are 2 ohm, some are less). Putting two voice coils in parallel will cut the total impedance in half (e.g. 2x 4 ohm voice coils in parallel = 2 ohms total). Putting subs in parallel will also cut the impedance in half.
At one end of the spectrum, you could put the 2 ohms DVCs in parallel, then parallel the two subs, and bridge the 2 channels of the amp. That would put 0.5 ohms impedance on the 1 bridge amp channel. If the amp can do 0.5 ohms x 1ch, do it. Otherwise, you may have to run the subs on separate channels.

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I have a JBL GTO 1201.1 mono amp and I have a kicker L5 solo baric with dual 2 ohm coils how do I run it to get the full power out of my amp?


You will not be able to get the full power from the amp without ruining your sub. The amp puts out full power into a 2 ohm load so option -A- is to just run one coil off the sub and it will absolutely pound -until you roast the coil.Then you can use the other coil and roast that one too. But since you do not want to roast anything-first thing to do is take it to the store and trade it in for a dual 4 ohm sub-wire the coils in parallel and there's your 2 ohm load to achieve max power from the amp. Problem there is that you will have WAY too much power for the sub to handle and you'll blow it anyways (in time).Best thing you can do is get an identical sub(dual 2-ohm) wire the coils in series which will make them 4 ohms per sub then parallel the subs to get back down to 2 ohms overall-you get max power from the amp and hopefully enough speaker to handle it.Hope that helps.

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Hello. I have one (1) XS-L1035 being powered by a JBL gts 180X 2/1 channel amp. The sub works fine if i power two(2) subs thru 2 channels BUT if I try to bridge the power to one sub the amp cuts out. Is it...


It sounds like the problem is with the amp. try using the other sub in bridged mode and see if it still turns it off. If it still turns off then its definitely the amp. In 2 channel mode you are using each channel at 4 ohms right? and in bridged mode to 1 speaker it should be throwing a ton of power on a 4 ohm load as well,it should work fine bro -its gotta be the amp

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1 Answer

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Hello saini_jatt_2, On the JBL3501 700 watt monoblock, you have adjustments for low pass and a setting for boost marked DBO, allowing you to select and boost the frequencies sent to the subs. If your amp is not the 3501, but a different JBL amp, the settings may be different. Set the LP to either the white dot (about 100Hz) or slightly below to about 80Hz. Set the HP to about midscale or slightly higher. Set the boost to wherever the bass sounds best. One other setting that will affect bass volume is the "input level" or gain control. It should have been properly set by your installer, but you can "tweak" it for best performance. Turning it up increases the sensitivity and matches it with the output from your head unit. Too high will cause distortion. Too low will result in less bass. So you want to set it just to the point that you begin to hear the distortion and then back it off slightly until the distortion disappears. Hope this helps.

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1 Answer

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Hello lilcylentsur,

It sounds like when you connect both subs, the impedance match is too low for the amp to handle. 2 4-ohm DVC subs with both the coils and subs wired in parallel will present a 1-ohm load which is too low for most amps.

The solution is to wire the voice coils in series, (connect a short jumper from one positive to the other negative on each sub). and then wire the remaining terminals to your amp. This will result in a 4-ohm load which most amps can handle.

Here's a "wiring wizard" which allows you to see the ohm loads of different wiring configurations.

Hope this helps.

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2 Answers

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1 Answer

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You can connect them in a series/parallel configuration. Put two of them in series and then connect the last one in parallel across the two in series. This would give you an impeadance of around 2.7 ohms. Only do this if your amp is stable at 3 ohms or less. I am not familiar with the specs of your amp. If your amp is only 4 ohm stable you can not do this.
This would also give you half the power on the two subs in series as the power for the one that is parallel. The two in series would be sharing the total output signal, where-as the one in parallel would get the entire output signal from the amp.
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If i had a picture to show you it would make sense, two subs in series that are in parallel with two subs in series.

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