Question about Kenwood KAC-8104D Car Audio Amplifier

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My kac-8104d is powering a hifonics brutus 10 inc sub 500 watts rms @ 2 ohms but it constantly goes into protectmode ive checked everything and im lost.

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Is the amp 2 ohm stable? does the amp have enough watts to support the rms of the sub

Posted on Sep 12, 2010

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I have 2 12 inch jl audio w7's with a kicker crossover and a powerbass equalizer 5 bands. i wanted to know if add a hifonics brutus 2100 d class amp to my subs at 1 ohm would it over power my subs. please...


Short answer: NOPE!

The Hifonics Brutus 2100 is stated to produce 2100 watts RMS @ 1ohm load. Most amplifier manufacturers overstate their claims. The 2100 watt output is most likely at 14.4 volts and not the 12.6 volts your car will actually be providing the amp.

But, even if the actual output was 2100 watts that would be 1050 watts to each 12w7. The 12w7's are rated at 1000watts RMS and 2000watts peak. As a MECP certified installer, any system I have done using 12w7's have had a MINIMUM of 1000 watts being provided to each speaker. My personal preference is to run 1500 watts each and keep the gains adjusted lower on the amp. Thus allowing the amp to run cooler and allow the additional headroom for those "show-off" moments!

Dec 22, 2010 | Hifonics Car Audio & Video

1 Answer

My system is running hot!!!!!


your subs are the problem, not your amp, your wiring your subs paralelle, means dropping input ohmage, allowing your amp to over heat with minimal load, check the amp specs for running at low ohms, most hifonics amps are rated 2 ohms and higher, some however will run at 1 ohm, only on class b-a amps though.(competition) dropping ohmage will allow the amp to push more power to the voice coils, however the voice coils may not be rated for 1 ohm power, what ohmage are your coils rated at? do you have a min. of 100 amp inline fuse on your 1-0 awg wire? do you have internal fans? you can add mosfets to the amp but if you do so, you'll have to re-program your amps mother board.

Jun 08, 2010 | Kenwood KAC-728S Car Audio Amplifier

1 Answer

I have a alpine M500 amplifier running a hifonics brutus subwoofer and i think it is blown. I don't understand how this could happen as the amp is only pushing 500 rms and the sub takes 600 rms. I got no...


Hmmm, let me see here. Did you mean to say you have TWO subs connected to this amp? A single sub can only be wired in series with the amp. Even if you have a capacitor wires in parallel, the capacitor is not a load, but a souce equivilant, and therefore can be merged with the amp as a single source when put on paper.

When they say a sub or amp is so many watts rms, that means that the device can function safely, without worry of failure. THERE IS NO LEGAL METHOD FOR DETERMINING THIS NUMBER AND NO REGULATIONS ON VARIANCES. Having said that, if an amp is 500w rms, it could very well push double that for long enough to blow your speaker. It all depends on how much power went through that speaker. So since you have a 4 ohm speaker, not two, and it would actually act like a two ohm speaker if you put another one in parallel because 4||4=2ohms equivilant. never never never, turn the bass all the way up if your gonna beat loud. Low frequencies draw lots of power and can damage your system.

you can tell if your speaker is blown by turning the volume to a medium listening level and placing your hand on the cone. you will hear a crackling sound if it is blown

GOOD LUCK AND PLS RATE THIS POST!!!!!!

Jun 05, 2010 | Hifonics Brutus BX12D4 Car Subwoofer

1 Answer

I have 2 15'' CVRs and a 1200w amp


1 OHM...ONE... sheesh now thats a low resistance for anything... If they are only 500 watts and they are in parallel, series well NO.. your amp puts out wayyyy too much for those speakers.. 1200w versus 500 watts by 2... srill NOT enough "Head room" for it to be safe... about half is all you could expect before Pop.. sound is heard.

Mar 05, 2010 | Kicker CVR152 CompVR 15 2/4 ohm 1000W...

1 Answer

Can i run just 2 subs on this 1200 watt kenwood 5-4-3 and if so what way will i get the most power, i mean do i bridge it or pute the speaker wires in other ports


you can run 2 subs given that you dont go over 2 ohms of resistance and that the subs are rated at 1000 watt max each around 4 or 500 watt rms. if your not sure about ohms dont bridge it and get single voice coil subs. this amp is capable of about 700watts constant power 1200 max spike if the voltage stays at 12 or higher.

Feb 05, 2010 | Kenwood KAC-X650D Car Audio Amplifier

1 Answer

Which are the differents diagrams to wire two sub dvc 4 ohms


I guess this Amp is stable down to 2 ohms. 500 Watts X 1. Unfortunately there is no way possible for you to present a 2 ohm load to the output of this amplifier. Here are your options.

Speakers in series with VC in parallel = 4 ohm total Z
Speakers in parallel with VC in parallel = 1 ohm total Z (not good)
Speakers in parallel with VC in series = 4 ohm total Z ( Whats the point)
Speakers in series with VC in series = 16 ohm total Z ( Whats the Point)

So your best option to maximize power transfer from your amp to your speakers would be option 1. (Z = Impedance)

Dec 13, 2009 | Kenwood KAC-8104D Car Audio Amplifier

1 Answer

I have 3 hifonics zeus Size: 12 inch Impedance: Single 4 Ohms Peak Power Handling: 800 watts RMS Power Handling: 400 watts Sensitivity: 89.9 dB Aluminum Cast Basket American Spider For Reliable Performance...


Hello king3132,

Three 4 ohm subs can be wired parallel for a 1.34 ohm final load or series for a 12 ohm load. If you have the channels of the amp bridged, I hope that the subs are connected in series because the Sony XM-2200GTX is NOT rated for or stable at 1.34 ohms. It's only stable down to 4 ohms.

You definitely will not get the maximum potential of the subs from that amp. They can handle 400 watts RMS each (total 1,200 watts) and the amp is only capable of 500 watts RMS into 4 ohms (less at higher impedance), so each sub could only be getting a maximum of 166.6 watts RMS.

Hope this helps.

Jul 20, 2009 | Digital Audio Car Audio & Video

3 Answers

Price check


that is 2 12 hitting 150 db you got to know what you are doing


Sep 14, 2008 | Kicker Solo-Baric L7 S15L72 Car Subwoofer

3 Answers

Hifonics bxi 1206d


make sure you have a 40 amp fuse in it
im going to try to describe this to you
to bridge a amp this is for 2 ch AMP

+ - + -
I 2 2 I
I 2 2 I
I I 22
I I 22
I I 22
I I 22
#1 SPEAKER #2 SPEAKER
WIRE WIRE
ONE GOES ON THE POSIVE OF ONE SIDE AND THEN THE NEGATIVE OF THE OTHER
HOPE THIS MAKES SINCE
PLEASE LEAVE MY RATING

Feb 11, 2008 | Hifonics Brutus BXi 1206D Car Audio...

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