Question about Kenwood KAC-X401M Car Audio Amplifier

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How many ohms is this amp - Kenwood KAC-X401M Car Audio Amplifier

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Your amplifier has the following specs:

Output Power at 12V:
1 x 200W @ 4 ohms (0.05% THD, 20Hz - 20kHz)
1 x 400W @ 2 ohms (0.5% THD, 1kHz)
Output Power at 14.4V:
1 x 300W @ 4 ohms (0.05% THD, 20Hz - 20kHz)

  • 1 x 600W @ 2 ohms (0.5% THD, 1kHz)

Posted on Feb 09, 2011

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Posted on Jan 02, 2017

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My speakers is100 watts which stk I'm going to us for the my radio and it's two speakers each one is 100 watts my radio is Sony TA-V715


The watts of the speakers are not too important when connecting to an amp. With large wattage speakers such as yours the amp will drive them. What you only need to worry about is someone turning the volume up to much, but only if the Sony amp can deliver a greater wattage than the speakers. If it can it will destroy the speakers at the highest levels.
However when connecting speakers to any amp, you must look at the Ohms of the two items. You must NEVER connect a speaker of lower Ohms to an amp of higher Ohms than it. Must amps and speakers will fall between 4 to 16 Ohms. If your amp says 4 ohms you can connect just about speaker to it. But if says 8 Ohms, you must not connect any speaker rated lower than 8 Ohms. Connecting a 4 Ohm speaker to an 8 Ohm amp will destroy the output transistors of the amp.

Nov 05, 2016 | Sony Audio Players & Recorders

1 Answer

Trying to connect 4 dual boss 12 to a 5500 boss class d amp


You can only connect an amp which has an output of 8 ohms to speakers that are 8 ohms are greater. You must NOT connect to speakers less than 8 ohms.
If the amp is 4 ohms you can connect speakers of 4 ohms or greater.
If the amp says 4 to 16 ohms then you can't go lower than 4 ohms.
As long as you stick to that rule the choice of speakers is up to you.

Mar 02, 2014 | Numark TTi USB Turntable With BuiltIn...

1 Answer

I have the Alpine MRP-M1000 amp. I want to use 2 subs with this amp. Which Alpine subs would work best with this amp?


this amp is rated at 600w at 4 ohms and 1000w at 2 ohm so as long as you calculate your speakers to match the ohm specs of the amp you can hook up

parallel = pos to pos and neg to neg of the 2 speakres
2 - 8 ohm speakers in parallel = 4 omhs
2 - 4 ohm speakers in parallel = 2 ohms

series = pos to neg of the 2 speakers
2 - 1 ohm speakers in series = 2 ohms
2 - 2 ohm speakers in series = 4 ohms

Feb 22, 2011 | Alpine MRP-M1000 Car Audio Amplifier

1 Answer

Just got two AR 312 HO speakers from my brother. I have a Yamaha HTR 6250. The speakers have (2) sets of cable hook up. One I assume is for built in sub woofers? Do I hook one normal and one to the sub...


do not use those speakers with that amp, those are 4 ohm speakers, which could damage your 8 ohm yamaha amp. you will have to get a 4 ohm capable amp to run the highs, and another 4 ohm amp to run the subs.

car amplifiers are currently 4 ohm, or even 2/1 ohm stable, but few, if any modern receivers can run at anything lower than 8 ohms without a danger of overheating. you may have to get a vintage amp(s), like a 1970's marantz receiver, or a 1980's to early 1990's kenwood power amp, because 4 ohm home amps are pretty scarce nowadays.

whatever amp(s)( you get, verify that they are DEFINITELY 4 ohm stable.

Nov 06, 2010 | Acoustic Research 312 HO Speaker

1 Answer

How to bridge two l7 kickers


It depends on the end ohm load you are trying to achieve. If your amp is rated at 2 ohms stable, then wire for 2 ohms, if 1 ohm stable wire for 1 ohm. EX. A dual 2 ohm woofer can be wired with the positive of 1 coil connected to the negative of the other coil, then connect the amp to the other two open terminals. This cuts the load of that speaker down to 1 ohm. When connecting the other speaker in the same manner, the two speakers a 1 ohm each add together to produce a 2 ohm load at the amp. NOTE- a 2 ohm amp running a speaker wired for 1 ohm will not have enough resistance to limit the power coming from the amp and runs a high chance of burning the amp up.

Oct 30, 2010 | Kicker S15L7 Car Subwoofer

1 Answer

I installed the MTX Audio JackHammer JH300 600W, Class D in my truck. Powering two alpine type-s 10' subs. Im using a 50a fuse at the battery. 8 gauge B and ground. I had the subs working went for a drive...


Your amp should not have a 50 amp fuse at the battery. It puts out 300 watts RMS (continuous power). The fuse at your battery should match the one that is on the amp itself. Your amp is overheating and there is a fault, possibly your speakers are wired to present too low of an impedance to your amp. Disconnect them from your amp, and use an ohmmeter/multimeter and measure the resistance load. It should not be lower than roughly 2 ohms. Depending on whether you bought dual 2 ohm or dual 4 ohm subs, that could be the heart of your problem.

If you bought D2 subs, you can get a 4 ohm load per sub with each sub's voice coils in series, and then parallel them together to get a 2 ohm load at the amp, which is perfect for your amp. Or you can wire each sub's voice coils in parallel, so that they're 1 ohm each, and then series them together at the amp for a 2 ohm load. The first method is simpler. Be sure that you haven't wired each voice coil in parallel (1 ohm per sub), and THEN also wired both subs in parallel to the amp (1/2 ohm load). That would definitely send your amp into protection mode, probably before it would have a chance to overheat. This is another reason why you should not have used a 50 amp fuse under the hood. If for whatever reason, the fuse on your amp doesn't blow, the amp is getting way too much current for it to handle, because of that 50 amp fuse under the hood.

If you bought D4 subs, you have a problem. If you've wired each sub's coils in parallel (2 ohm per sub) and then wired both subs together in parallel at the amp (1 ohm load) you're presenting too low of a load to your amp. Again, this will overheat your amp and send it into protection mode, both of which are what you're seeing. You never want to have two D4 subs with an amp that only handles 2 ohms, because you can't get a 2 ohm load with two D4s. You're stuck with 4 ohms or 1 ohm. 4 ohms cuts your amp power in half, 1 ohm cuts it off completely.

If you know for sure which way you've wired them, then you now have the information to tell you whether you've done it incorrectly or not. If you're not sure, first disconnect your subs and measure the resistance as I described in the first paragraph. If your amp is seeing a 1 ohm or 1/2 ohm load, there's your problem. If you see a 2 ohm load (subs are wired correctly after all) then you may have a bad ground connection, or your amp is bad and needs to be serviced/replaced.

Nov 15, 2017 | MTX JackHammer JH300 Car Audio Amplifier

1 Answer

Have a 2000 gmc sierra ext cab pickup and two type R swr-1042d subs and would like to know the best enclosure for the subs to get maximum performance and the best ways to hook up a one channel mono alpine...


it depends on the amp what can it handle. will it do 2 4 or 8 ohm is it 1 ohm stable are the subs dual 2 ohms or dual 4 ohms. 1042s are dual 4 ohm subs so if you wire them both in paralel it will drop both subs into a 2 ohm load for each sub that is pos of one coil to pos of sec coil then pos to pos on amp and same with neg to neg to neg on amp. now if your amp is 1 ohm stable i would do both subs the same way you will get the most power out of the amp. but itll run a littl hot if you dont have adaquate power running to the amp. now i wanna think your alpine amp maybe only 4 ohm stable. i would run both subs like i had said pos to pos then neg to neg now both subs will be a 2 ohm load so what you do to bring it back up to 4 is you run the 2 bridged subs into a series which is pos from one sub to neg of the other sub the remaining pos and neg will run to the amps pos and neg. which will make it into a 4 ohm load. now the last scenereo is your amp is 4 ohm or 2 ohm stable. this is how to wire it to 2 ohms and not 1. take one sub go pos to neg then pos to pos on amp and neg to neg on amp this will make an 8 ohm load with one sub take other sub and do the same neg to pos on sub then pos to pos on amp and neg to neg on amp this will tell amp to run a 2 ohm load. 2 ohms is a good run for these subs if the amp can handle a 2 ohm load. now if you would have given the amp model number i could have looked it up to just give you what you needed but with this short info i gave all possibilities.

Apr 20, 2010 | Alpine Type-R SWR-1042D Car Subwoofer

1 Answer

2 12" dvc subs 2 ohm stable amp


+ on amp output to + on speaker #1 to + on speaker #2. - on amp output to - on speaker #1 to - on speaker #2. This is a parallel circuit....4 ohms in parallel with 4 ohms = 2 ohms. IF it were wired in series....would represent 8 ohm load.

Nov 12, 2009 | Kicker KX2500.1 Car Audio Amplifier

1 Answer

IF THE WOOFERS HAVE 2 VOC.COIL EACH HOW DO YOU CONNECT WITH THE AMP THAT HAS ONE CHANNEL WITH TWO + AND TWO -.


it depends on the load you want to present to the amp. un 12, 2009 - If woofers are 2 coil, then you definately need to know the impedance of the coils (are they dual 2 ohm, or dual 4 ohm?). For dual 4 ohm speakers you will only be able to acheive a summed load of 1 or 4 ohms. If your amp can handle 1 ohm, then connect this way: 1 ohm: Connect both the positives and the negatives together on each speaker. This puts them in paralell which will result in a 2 ohm load per speaker. After you connect the two 2 ohm loads to the amp, it will see 1 ohm as it's load. If your amp can handle this, this is usually the lowest configuration capable by consumer stuff, (if you are not doing competition or some crazy thing), and few amps are rated for 1 ohm so it's not really recommended and may heat up or blow your amp. 4 ohm: Connect one negative to one positive terminal on one speaker. Drive the other open terminals with the amp. This places coils in series and results in an 8 ohm load per speaker. After connecting both speakers to the amp, the amp will see a 4 ohm load. In both cases, the rates power of the amp (at that load) will be divided equally between the speakers. Jun 12, 2009 - For dual 2 ohm speakers, the only loads you can achieve are .5 ohm (1/2 ohm), and 2 ohm. The connections are the same as above, and this results in: ...If coils for each speaker are wired in paralell, the results are 1 ohm per speaker, and after connection, the amp sees 1/2 an ohm. (.5 ohm) ...If coils are wired in series, the result is 4 ohms per speaker, and the amp will see 2 ohms after both are connected.

Jun 12, 2009 | Volfenhag ZX-4712 Car Subwoofer

1 Answer

Ohm calculations; 4 and 8 ohm sub woofer?


+ output from amp to + input of 4 ohm to + input of 8 ohm AND - output from amp to - input of 4 ohm to - input of 8 ohm is a parallel circuit = 2.66 ohm impedance load for amp
+ output from amp to + on 4 ohm - on 4 ohm to + on 8 ohm - on 8 ohm to - of power amp is a series circuit = 12 ohm impedance load for amp. Clear as mud??
Clear as mud?

Jun 11, 2009 | Jl Audio 12W0 Car Speaker

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