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Could be a number of things. First try another sub, your current sub could have a problem. Second could be to low ohms going to the amp. Is it a new install or was your current setup playing fine then your current problem happened. I need to know what kind of amp and sub and how do you have it hooked up. If it's a 2 channel amp and your running it bridge mode then the amp needs 4 ohm sub hooked up unless specified that it can except a lower ohms. Could be a voltage problem as well. You can contact me at email@example.com let me know if this helps.
If the Pioneer has only one sub output connect it via a single RCA to the mono one. If it has two outputs (L&R) connect it to the L&R on the sub via a dual lead.
The other connections on the sub are for those amps without a dedicated sub output.
The manual for the sun can be seen online.
Ok, your post has two different models listed. Let's start with something you need to know about your amplifier. Is it one ohm or two ohm stable. This will make a difference. Also, whether your subs are single voicecoil (HFI12s4) or dual voice coil (HDI12d4).
Let's start with the easy scenario. Let's say your amp is two ohm stable and you have two single voice coil subs. It's simple. You go from the positive of the amp to the positive of both subs and the negative of the amp to the negative of both subs. This will provide a 2 ohm load to the amplifier, thus pulling all the power out of it.
Unfortunatley, if you have two dual voice coil subs, you won't be as efficient. You will only have the options of a 4 ohm load or a 1 ohm load.
This is where having a one ohm stable amp would come in handy. If the amp is one ohm stable, hook the positive of the amp to all 4 of the positives on the subs, and hook the negative of the amp to all 4 negatives of the subs. This produces a 1 ohm load.
WARNING!! If you have a 2 ohm stable amp DO NOT use the last wiring scenario. It will fry your amp.
Now, the last is a little trickier. This is for two dual 4 ohm subs. Follow closely. Hook the positive of the amp to one of the positives of each sub. (do the next step to both subs) Go from the negative of the voice coil that you hooked positive from the amp is hooked to, and hook that to the positive of the unused voice coil. Then go from the negative of that voice coil and hook to the negative of the amp. Make sure this is done on both subs. This will give you a 4 ohm load.
on the back there should be 4 AV style receivers. 2 are for speakers and 2 are for sub. the sub will more that likely be labeled SW with a red and a white. If there are only two AV receivers than you probabally cannot hook up a sub properly. But you can always use the speaker ones, just wont be as good
First I hope you remove the speaker wires from the speaker that come from the built in amplifire. You cannot hook the powered sub to the amp without doing that first. Then all you need to do is run speaker wire from the sub out of the box to the amp. In no way can you hook up any other part of the powered sub, but the sub itself, to the amp. If you know the wattage of the sub and the ohms then wire it to the amp correctly. Your phoenix amp will put out 125 watts x 2 at 4 ohms and 250 watts x 2 at 2 ohms and 500 watts x 1 at 4 ohms bridged. Remember, only the sub itself in the sub enclosure can be connected to the amp. Hope this helped you. Let me know if you need more help.