Well i have a brand new amp ma hk401sx series and after i installed it i noticed that it has no power at all being feed to it that i kow of no leds or noise at all i hooked up the remote to it and i have no problems gettin a led o the remote only can you help me
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Re: amp is powering on at all
With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.
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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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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.
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
Supply 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
If there is no protection light on, be sure the input is on. Some head units need to be turned on manually (factory set to OFF).
Verify the subwoofers are wired properly.
A list of your components would help to solve your problem.
If it is new, it should still be under warranty - worst case scenario output transistor(s) blown, or power supply bad.
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.
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.