Question about Kenwood KAC-9102D Car Audio Amplifier

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Ohms if i have two 3.3 ohm subs what will be the impedance

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Re: ohms

If you put the 2 in series you will get 6.6 ohm's of impedance or if youput them in parallel you will get 1.65 ohm's of impedance.

Posted on Nov 30, 2006

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How come my two subs wont get powered with a 12 ohm load. is it to high of a load. they are 12

HelloCheck the output impedence [indicated in OHms]]. You can get it from its manual. If it is designated as; 8OHms for example; you can connect one 8OHMs speaker direltly, or two 4 OHMs speakers in serieal connection. Likeways, if the output impedence is 6OHms, you can connect one 6OHms speaker direltely, or 2 12OHMs speakers in parellel. Just see, when we connect thow speakers in serieal, the impedence will be the sum of both speaker impedences. if we connect the same in parellel, the impedence will get halved. OK.

Dec 19, 2011 | Car Amplifiers

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How do you hook up the speaker wire to the ab sub out and what is the best way to hook them up at what ohm

Not sure what you mean by AB but being that this is a monoblock or 1 channel amplifier you can only hook it up 1 way. Verify the polarity from your speaker box. + to + and - to -. As far as your impedance is concerned this amp is stable to 1.5 ohms but for this case we will assume you have two 4 ohm subwoofers. When you parallel these together you will have a total effective load of 2 ohms on the amplifier. This is a stable operating impedance for the amp.

Other impedance options are:

two 8 ohm speakers = 4 ohm load
three 8 ohm speakers = 2.66 ohms

If you have dual voice coil subwoofers then parallel the coils on each sub + to + and - to -. Depending on the impedance of each sub you may then have to wire the individual subwoofers in series. Here is an example.

2 dual voice coils with 4 ohm taps

Each subwoofer with the coils in parallel would be a 2 ohm load if you were to then parallel the two subwoofers together you would have 1 ohm total load on your amp. This is BAD for your amp. Your option is to run the subwoofers in series.

To run the speakers in series is simple. The + from one speaker and the - from the other will be connected to the amp. The other + and - from the speakers will be connected together.

Here is a wiring diagram from kicker.

Jun 11, 2011 | Jl Audio Slash 500/1 Car Audio Amplifier

1 Answer

I have the MRP-M1000 amp. I want to hook up 2 alpine subs to this amp. Which alpine subs would be the best for this amp? Please be specific with ohms and watts.

Your best bet will be to wire 2 subs in parallel to the amp. Each sub should be rated for at least 300 watts rms at 4 ohms. This will give you a total impedance of 2 ohms, and your amp will put out 600 watts rms at that impedance. That way, each sub will receive 300 wats rms. I would not recommend wiring subs in parallel, as you will need two 1 ohm subs at 300 watts rms, which are harder to find and will be more expensive. A parallel circuit is the most efficient way to do it.

Feb 23, 2011 | Alpine MRP-M1000 Car Audio Amplifier

1 Answer

I have a audiobahn a400t and im running 2-12''jh45 mtx jackhammers the speakers are wired in parallel stabel @ 2or1 ohm. the speakers are in a ported box. how do i run my wires to my hook these up right to...

Hello rattle822,

A pair of JH4512-04's can be wired to 2 ohms if the subs themselves are paralleled. There's only one voice coil and it's 4 ohm. If wired in series, the final impedance to the amp would be 8 ohms. They cannot be wired to 1 ohm.

In bridged mode, your 4-channel amp is only stable down to 4 ohms. You can bridge 2 of the channels to provide a relatively low 200 watts RMS X 2. The best power solution for your subs would be to bridge channels 1 and 2 and wire one sub to it. Likewise, bridge channels 3 and 4 and connect the other sub. If you connect both subs in parallel, the impedance will be too low causing the amp to overheat and possible fail.

As for the settings: Low pass filter on, crossover somewhere between 80-100, input levels to match your receiver, and bass boost to your personal preference.

Hope this helps.

Aug 13, 2009 | AudioBahn Car Amplifiers

1 Answer

Subwoofer Dual voicecoil wiring

1 ohm will draw too much current.those are designed for a 2 channel 2 ohm drive for each sub.running 4 ohms will be easier on the amplifier and since impedance is not constant it may run 3 ohms at some frequencies anyway. another solution if your power amp is bridgeable....put the coils in series on each woofer making 4 ohms.then parallel the two 4 ohms to make 2 ohms and run the amp in bridge mode at 2 ohms.since bass is omnidirectional,you can do it

Jun 13, 2009 | PPI DCX-500.2 Car Audio Amplifier

1 Answer

Sub Wiring

Hello jtkpay,

Rockford-Fosgate claims their latest V-power 1500bd is stable to 1 ohm, and I would think that your Oldschool would also be. The 2 wiring options for 3 subs with 2 ohm dvc would give you a 1.34 ohm load and a 3 ohm load. The 1.34 ohm option would mean more watts to the subs, but the amp will run hotter. The diagrams look like this:


Using just 2 of the Kickers, you can wire 3 different ways, with final impedances of 0.5 ohms, 2 ohms, or 8 ohms. You do not want the 0.5 ohm load. It's bad for the amp. You don't want the 8 ohm load. It doesn't allow the amp to produce as much power. So that leaves only the 2 ohm, with coils in series and subs in parallel. It looks like this:

Hope this helps. If it does, please rate as "FixYa".

Apr 27, 2009 | Rockford Fosgate Power 1500BD Car Audio...

1 Answer

Need help

Hello bully_bread,

Your amp will be powering the sub at 4 ohms.

The impedance or "load" that the amp sees is determined by the number of voice coil(s), the number of sub(s), and how they are connected. Whatever that final load, it is the impedance or "ohms" that the amp is supplying power at.

A single 4 ohm sub with a single voice coil cannot present a 2 ohm load. However, a sub with dual 4 ohm voice coils wired in parallel will present a 2 ohm load.

Here's a link to Rockford_Fosgate's "wiring wizard" where you will find all combinations of subwoofer wiring and the resulting loads.

Hope this helps.

Apr 13, 2009 | SPL Audio Phantom DK2-1000 Car Amp

1 Answer

Heating up and clipping

A number of things could be wrong. First off, how do you have the 3 subs wired that will actually give you 2 ohms? For instance, if you had 3 single voice coils and they were each 4 ohms You would be sitting around 1.5 ohms. Or if they were dual 4 ohm subs then you could have wired the voice coils in series then the subs in parallel and came up with about 3 ohms. Unless the kickers have an odd impedence then there is no way you have 2 ohms from the subs to match the 2 ohms at the amp. So what I would do is try to match the impedence as well as I could. Also, make sure the amp is well ventilated. do not screw it directly down to a surface, put some 1/4" spacers on the screws so some air flow can get under the amp also. I hope I could help. Good luck
-Andrew Hawkins

Jul 14, 2008 | Kenwood KAC-9152D Car Audio Amplifier

2 Answers

Dual voice coil wiring to class d amp

The easiest way to think of wiring voice coils and subs is this:
  • Two items of the same impedance in parallel = Half of the impedance
    • 4 ohms in parallel with 4 ohms = 2 ohms
    • 8 ohms in parallel with 8 ohms = 4 ohms
  • Two items of the same impedance in series = Double the impedance
    • 4 ohms in series with 4 ohms = 8 ohms
    • 8 ohms in series with 8 ohms = 16 ohms
In this case, you want to wire two subs, each with dual 4 ohms voice coils, so that the total equals 2 ohms. Your options are:
  • DVCs in parallel, 2 subs in series = 4 ohms
  • DVCs in series, 2 subs in parallel = 4 ohms
  • DVCs in parallel, 1 sub = 2 ohms
With two, dual 4 ohm subs, you can only have 1 ohm or 4 ohm total impedance.

Mar 16, 2008 | Car Amplifiers

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