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Questions & Answers
How do you install the hk-401sx amplifier?
A 4 Gauge or even better a 2 Gauge power cable Starting from the Battery going thru a fuse block which should not be more than 12 inches away from the battery then to the battery connection on your amplifier the states 12V.
A similar gauge cable connected from the GND negative (minus) of the amplifier to a good clean and cleared of paint location on the chassis somewhere in the boot (secure well)
A cable connected form the blue and white cable at the back of your head unit to the remote input of your amplifier which is next to the speaker outputs on your amplifier and clearly indicates REMOTE.
A stereo RCA interconnect from the output of your head unit to the line in of your amplifier. Best if there is a dedicated sub woofer output.
You then connect your sub woofer.
Amp is in protect mode
If you have'nt fixed your amp by now I thought I'd tell ya a couple of things why it's going into protect. The basics. Blown subs, bad power suply or mosfets, and blown output transistors/mosfets. Still need help let me know. I repair amps for a living and i'm the cheapest you'll find and honest. I also give the longest warranty. I'm tired of other people rippin people off on repairs. Let me know. Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/mark_b53a7494531bf96d
When the rca cords are
You have a bad ground in most cases.
Because of this the amp tries to pull ground from the RCAs which are connected to your grounded headunit chasis.
To make a solid amp ground. Find a piece of metal (not the back deck), scrape off the paint and then use 2-3 self tapping screws with washers to keep the ground from moving.
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I have 2 dvc 4 ohm alpine type r 15's and 2 svc american bass
Hi mate very nice amp you got there here is the specs for it
Model: MA Audio HK401SX
Hard Kore Series 1800 Watt 1 Channel High Performance Class
X Car Amplifier
1 x 1800W RMS @ 0.5 Ohm Mono
1 x 1200W RMS
@ 1 Ohm Mono
1 x 650W RMS @
2 Ohm Mono
1 x 500W RMS @
4 Ohm Mono
Fully Unregulated MOSFET Power
2 Ohm Stable @ Mono
1 Ohm Stable @ Mono
0.5 Ohm Stable @ Mono
if you have 2 12s just bridge them and you will have 650wrms at 2ohm running to them or one sub at 4 ohm 500w rms ps they should pump iam running 2 12s with just 360rms at 2ohm and they do the job good luck
How do i drop it down to 0.5 ohm
there are no settings on the amp, if it is made to be stable at .5 ohm you will need 8 voice coils to make .5 ohm, if your subs ar 2 ohm, you will need 4 coils to make .5 ohm when hooked in parallel
My brand new system isnt working right...
All righty then, This is most often gaused by bad grounds. Make certain the ground of the amp is a solid clean connection. The best place is under one of the rear seatbelt bolts, next check the condition of the ground at the battery this has to be clean with a good connection to the chasis, third make sure the Head Unit also ahs a clean positive ground.
If these do not yeild results then get hold of any littel portable radio, cassette player, mp3 player as long as it has a earphone jack. Get one of those cables that have a earphone plug on one end and RCA plugs on the other. Disconnect the RCA's from the HU and hook up the player. Power up the system and play back from your portable player, mess with the gain on the amp and see if you still have the same problem when playing back from the portable device. If the problem goes away then you probably have blown grounds on the RCA's on the head unit and only a repair shop can fix that or a new HU. If you still have the problem with the portable player then adjust your lowpass filters and cut off to a higher frequency until the problem goes away. The gain on these amps should never be used to make up for low output from the Head Unit. (another cause for this condition) Get a HU that has 4 to 6 volt sub outputs and crank the gain down on the amp. That gain control is to control distortion (over driving the amp) not to make it louder. If you want louder then go for the HU with the higher sub output voltage or go with a SUB with a lower ohm rating. Your amp is stable down to 1 ohm. Oh and double check if you have your subs wired correctly improper wiring at the subs can m ake this problem worse.
Does the amplifier do this when you don't have the sub hooked to it? If so, you have a pinch/short in your ground or power wire. If not, the subwoofer has a short in its voice coil or the amplifier needs to be repaired as it cannot handle a typical load.
Have you installed Kicker capacitors? With the extra power you have you will need them to help with the load.
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