Question about Pioneer Gm-d8400m 1200w Max, Class D Mono Amp Gmd8400m
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Posted on Jan 02, 2017
SOURCE: witch is better
hi there. ill start with the wiring. you should have a blue remote lead going to the back of your head unit, the power cable running straight from the amp to the battry, the earth should be earthed in a fairly decent place, any metal inside the car realy, and then your wires pos and neg from the amp to the subs. the reason why the kenwood might not have much base on it is to my knowledge, there should be a switch somewhere on the amp that will increase or decrease the power input for the speakers, if this is set very low then hense why theres not much base comming from them. if the amp is on and its giving something to the subs it probably isnt the wiring. try checking the amp for the switch first, if you cant find it try the pioneer amp and see if theres any diference.
dont hesitate to contact me if you get stuck
Posted on Nov 18, 2007
SOURCE: My Pioneer GM 5300t amplifier
Do not continue to put new fuses into the amp until you have figured
out what is causing the problem. It will only increase the chances of
causing more damage to the amplifier. I have been repairing car and
home amplifiers for over 18 years and have a lot of experience with
Pioneer amplifiers since I work at an authorized Pioneer service
This post will be long, but if you bear with me and forgive my long-winded answers you may be able to determain your problem even tho I really don't have enough information to figure it out yet. If not, we can get a little closer with more information.
Does the amplifier blow the fuse as soon as you connect power to it, or as soon as a new fuse is put into the amp? If so, the amplifier has some shorted components in the power supply. They have a bank of mosfet transistors in the power supply that sometimes get shorted when the amp has been pushed beyond it's ability, or just from a random part failure, or if the impedance of the speakers is too low. Your speaker is a 4 ohm speaker, if it is at a lower impedance than 3 ohms when measured with an ohm meter then it will need to be replaced. Even if it still plays, it is too low of a load for the amplifier and will cause more current to go thru the amp than what it was designed for. If you are using more than one speaker and have them bridged it will do the same thing. This amp is rated at 4 ohms bridged and 2 ohms per channel stereo. When you connect 2 speakers together and then bridge them they become a 2 ohm load which causes double the amount of current to flow thru the amp. It was not designed for that. Sometimes you can get these component failures just because there may be a solder joint or two inside the amplifier that is cracked and not making connection very well and this can cause components to short out because they are not operating at the proper voltage.
If your amp blows the fuse only after it has been turned on by your head unit, you will most likely have a blown channel. This would require the replacement of the output transistors of the bad channel as well as a few resistors and sometimes a few other parts.
If your amp will turn on and play for a while and then blow the fuse at higher volume levels or after a long time playing the problem can be either a bad speaker at a lower impedance or one or more components that are breaking down after they get hot or at a certain volume level.
As you can tell by now there are many reasons that an amplifier can blow the fuses, and figuring out just what the cause is can sometimes be a difficult task. It may require that you have a multimeter to do some checks on the amp and a power supply to power the amp on a bench so you can do those tests.
If this information has not helped you to determain the problem, please give me as much information as you can about how you are using the amp. How many speakers, where they are connected, at what point does the amp blow the fuse, and anything else that you can think of that may or may not be important. You never know what might give a better clue, too much information is always better than too little.
Thanks and good luck,
Posted on Nov 13, 2008
Length (L) = 31.9 cm =
12.6 inches (approximately 12 1/2 inches)
Width (W) = 51.5 cm = 20.3 inches (approximately 20 1/4 inches)
Depth (D) = 19.7 cm = 7.76 inches (approximately 7 3/4 inches)
Posted on May 04, 2010
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