20 Most Recent Nitro BMW-481 Car Audio Amplifier Questions & Answers

Disconnect all speaker connections and rca cables. Leave power, ground and remote wires intact. Try turning on again. If you still have a protection light your amp is faulty. Hopefully you have warranty. D .A thumbs up would be greatly appreciated if this answer is helpful to you. http://www.nitrobmw.com/

It sounds like the shield ground in the amplifier is broken. If that's the case, the connections would have to be repaired.

Let me know if you have any other questions.

First you need to determine what kind of subwoofer it is and by that i mean, is it a dual voice coil subwoofer or a single voice coil sub woofer.
Dual voice coil(DVC)
Depending on how many Ohms each voice coil is you will have the amplifier drive a specific load (4OHM stereo (75 RMS x 2) 150RMS total power / 2OHM stereo(100RMS x 2) 200RMS total power) Connect each voice coils separatley to each speaker output of the amplifier for this configaration. Always making sure that the + & - of each voice coil go to the coresponding location of the speaker outputs of your amplifier.

If your sub woofer is a single 4OHM voice coil then your cables should be connected to the coresponding location on your amplifier which states "BRIDGED" It is marked clearly on the speaker outputs of your amplfier.

If it is a 2OHM then do not connect it to the amplifier. The specific amplifier is not stable at 2OHMS bridged and will most likely get damaged if you try to operate it at that OHM load.

IMPORTANT:
On the side of the amplifier where the adjustments are there is a switch that indicates X-OVER. (LPF/HPF/FULL) Make sure to set it to LPF (Low Pass Filter). (not doing so can damage the subwoofer)
On the left hand side of the X-OVER there is the adjustment for the LPF (30-250) the best setting would be at the same frequency that your speakers stop
(example):
If your speakers have a frequency response of 60Hz to 20KHz then setting your LPF to roughly 70 to 80 will be ideal. The rule is that where one speaker drivers frequency ends, the other must continue in order to complete the full range of audible frequencies.

if you have any more questions feel free to ask.
Respectfully
dreamsystems

if your amp has a bridge do nt bridge the subs just connect them normal planet audio subs usually dont have a high potential to withstand too much watts even if the subs say 1200 watts thats not true nwatts check the box the subs came in it will tell u true wattage it may say rms

could be blown fuse could be shorted output or to much a load bad ground bad signal or damaged amplifier take it to a professionall installation facility to many things from that description could be the problem

do you have the right size ground wire, relative to your power wire? If your ground is smaller when you turn it up there is alot of power it needs an exit and if the wire is too small it travels elsewhere maybe your rca, causing your amp to protect.

does it have a diagonstic light ? sub/ spk wires clear and not touching eachother? battery ok? check ground abd turn inon wire to amo w/ test light for "switched" turn on power from head unit

IF FUSE ARE BLWN OFF EVERYTIME YOU REPALCE THEM, THEN THE AUDIO TRANAIATORS ARE DAMAGED, OR POWER IRF TRANSISTORS ARE DAMAGED, REPLACE THEM WITH SAME TYPE OF NUMBER IF YOU CAN DO IT, OR TAKE IT TO QUALIFIED PERSONAL

Hello, if you still have'nt gotten your amp to work still than I suggest making sure that all your power and ground wires running to the amp are good, also make sure you have power on the remote turn on wire. Check the fuses to. If it still does'nt work after all that then something is wrong internally. If you want to have it fixed if it is a problem internally I do amp repairs. I'm the cheapest you will find for any type of amp repair. I have a degree in electronics and electronics engineering with over 15 years experience. Most of my customers I get are from fixya.com Just send me a private message and I'll return it asap. Hope this helps Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/mark_b53a7494531bf96d

Sounds like your amp is probably damaged, maybe you had the ground and 12v wires backwards?