How tohook up sub out rcawires with only one pre out wire

Hi, what you want to do is just connect the speaker wires from the head unit straight across to the pre-amp inputs of the amp. If you have a sub, also connect the pre-amp outputs of the head unit to the 2 sub inputs of the amp. Connect the blue wire of the head unit to the turn-on terminal of the amp and connect power wires to both units. May I ask what speakers are you using?

You should have two (or more) RCA plugs on the back of the deck that will act as pre-amp outputs for subwoofer and speakers.
Failing that, your wiring harness should have come with a wiring diagram that will let you know which is the subwoofer output.
Failint THAT, the deck itself should have a wiring diagram on the bottom or side telling your which wire is which.

And if that fails, Your deck may not have a subwoofer output. Just attach your sub to the amp pre-out like everyone else.

Tell your source (receiver???) that it has a sub and set it up to feed LFE out of that RCA jack.

Prove your sub pre-out works. Or send something like FM on Tape Out to the sub and see how that works out.

How did you hook a speaker wire to this model of powered sub? What was on the other end of that speaker wire? It's not designed for speaker level input.

Sorry for the stupid question but is your subwoofer a powered sub? The subwoofer out is just a preamped signal that drives a powered subwoofer. Let me know then we can go from there.

Hello there..Thats normal only if your sub volume and the pre amp is turned up..Your amp is the cause of the speaker jump..Turn amp volume sub level down a few and check your wire from sub to amp..If all of that is good is a normal operation for pre amp warm up in sub if level is turn to max..Try unplugging amp freom sub then turn sub on stand alone(just sub outlet plugged in and no wires from base amp plugged in..If sub stops the its the amp making the problem..If it still is there then the pre amp is either dusty on inside or the outlet plug that it is plugged in doesnt have a good ground..Hope these help to solve your problem..Have a great day...

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_a3369546f8067589

You need to run the RCA cables from the head unit to the sub for the audio signal, and possibly a turn on wire (the blue one on the back of the head unit), unless the sub has an automatic power feature.

The sub also needs power and ground wires attached, but those do not connect to the head unit. Power should be run directly from the battery with an inline fuse, and ground should go to the nearest good ground point (Trunk latch, seat bolt, etc).

Remote wire from Jensen is blue or blue/white. Use Blu/white if there is one. . RCA's, for subs, use the rear if no subwoofer pre-outs are available. If unit has sub pre-uts, use them as the head ubit (stereo) would have a level that can be raised or lowered thus giving you more control over the input to the sub amp.

use the sub pre out and wire it into the left input on the sub.

first make sure the actual sub is powered on .You can tap on the RCA leading to the sub and hear the sub humming..Im assuming you do have a powered sub connected to sub out of receiver .Also you could also connect another type of speaker with RCA to make sure if it has output or not..Also make setup does have sub output ON..thanks

May not necessarily be the out put, discontect the sub from the receiver and see if it still makes a hum, Making sure that you turn auto on, off on the sub woffer.
If it still makes a hum, then you have a earthing problem, you can get a earth filter put on your internal wiring in your home, or you can remove the earth pin on your sub woffer