I recently replaced my two 12" subs due to a problem in the voice coils. It seems they were pushed beyond their limits and they broke. These I had installed in parallel and enclosed in a dual bandpass box. I replaced them with a pair which I initially thought would provide more options a pair of dual voice coil 12" subs. The problem that I have is that when I initially wired them in parallel I believe that presented my amp with a 1 ohm load, this was only temporary as both of the 20amp fuses in my amp blew and I discontinued testing. I disconnected the box and tried rewiring the subs dvc in a 4 ohm configuration, which is a combo of parallel and series wiring. This when reconnected and with fresh fuses in my amplifier provided a different but equally disappointing outcome. It worked for a short while and when then the amp began going into protect mode. What happens here is the logo which lights up and the clipping light blink on and off, the clipping light is red not yellow as it normally would be in a clipping situation. So once again I disconnected the box pulled the subs and wired them exactly as if they were single voice coil subs, only connecting positive and negative to one set of terminals. this time when I hooked it back up to the system and did a test with the vehicle off they sounded fine. so I turned the vehicle on and they worked for about ten minutes as I was driving the vehicle then the same thing happened. The amp went into protect mode, blinking on and off. Another thing I noticed was that there seems to be no problem in operation at a voltage of about 12volts, when the vehicle is running this is obviously not the case and the voltage is around 14volts which the amp never had a problem with before. Is there any way to fix this without taking the amp apart or having it serviced? Also as part of my system I have two other amps which run the full range speakers and they have not been affected. The sub amp is an Eclipse d class XA1000, its power is taken directly from a 2.0 farad capacitor and I've only had it for two months. Any help or thoughts would be greatly appreciated.
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Re: eclipse XA1000 and protect mode
It's likely that the output transistors failed. That's the most common cause for an amplifier to go into protection.
With no power applied to the amp, set your meter to ohms and measure the resistance between the terminals of the output transistors. You should find none that have anything close to zero ohms between any of the terminals. If you find one or more that have ~0 ohms between therminals, they need to be removed from the circuit and checked. If you have several in parallel, it may seem as though the entire group is shorted but generally one fails and the others are OK. Of course, when you have one defective transistor in a group of parallel transistors, you must replace all of the transistors in that group.
Open or broken emitter resistors can cause an amp to go into protect. If you don't find any shorted outputs, make sure there are no broken terminals on the emitter resistors.
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It will depend on the capability of your amp. Each sub has dual voice coils (DVC). Each voice coil is (probably) 4 ohms. If your amp is a single channel, 1 ohm stable amp, you can connect all of the voice coils from both subs in parallel on the amp output. Other configurations will depend on the amp's number of channels and minimum resistance your amp can withstand.
This could be caused due to the impedance load being to low. Your amp is stable to 2 ohm load however its very possible that you have your subs wired to a 1 ohm load that would cause the amp to go into protect mode. The subs you have are dual 4 ohm voice coils and would need to be wired in series/parallel. I've included a link that will show you how the subs should be wired.
If both subs are dual voice coil, you can wire one voice coil to other voice coil on each sub. Do this by running the ground of each coil to the ground of the other coil. Do the same for the positive. After doing this on both subs, you should have one ground and one positive per sub. Hook one up to the left channel of amp and one up to the right....This should work for you. If your amp plays for a while then goes into protection mode, then it cannot handle the ohm load.
You likely have a speaker with a swollen voice coil. Voice coil becomes hot due to under powered amp being clipped. Voice coils swells and rubbs. shoteing amp output causing amp to go into protect. replace speaker before amp is damaged. The more capacity an amp has wattage rating. the easier it is on speakers. Most speakers are damaged by underpowered amps being clipped rrather that too high of amp reting.
If you have a dual voice coil sub, make sure that you have the positive and negative terminals connected properly. If you have ONE of the coils wired backwards, it will cause the speaker to produce little or no sound.
Have you set the gains properly?
Are you sure the amplifier is receiving a strong signal from the head unit?
Hi Saint108. You're describing it well, and i know what the problem is already. The MA audio amp, can't hold with a 2 ohm load. It's too low for that amp, that's for sure. Those are budget amps and they are not well built enough to handle low ohm setups like that. It's overheating and there's no ways around it..
Other than wiring your subs differently ! Just wire your sub directly (not in parallel) in a 4 ohm load, you will notice it will stop overheating that much. Do it quick, you'll most likely fry your amp giving it such hard work !!
The HUM you're hearing could be related to it also. Try that, and keep me posted on the status. Thanks ! Cheebster.
if you push a sub too hard for too long the varnish on the coil windings will melt, causing parts of the coil wires to short toghther. This will change the impedance of of sub (or speaker). Since the speaker is hooked up to the amp and the amp requiring a steady impedance (usually 4ohm or 2 ohm). if the coils go bad , the impedance will change, the amp hopefully will go into a protect mode, if not the amp will damage itself. Warranty does not cover overpowering a sub of amp (if the can tell it was.)
hope this helps.
I run one sub on my Kenwood Amp also. It does over heat also. My conclusion is that we are both trying to push that one sub too hard and the amp is having to work really hard to make that sub do what we are asking. Also, not having enough power or a good ground will cause it to over heat. I am going to go with the voice coils are heating up though.