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The simplest way is to connect both the left and right channel speaker wires from your amp or receiver into the speaker wire connections on the back of the sub labeled "From Amplifier"
Then connect speaker wires from the adjacent terminals labeled "To Speakers"
What you are essentially doing now is using the internal crossover of the subwoofer where you determine at what frequency the sub begins to blend with the other speakers.
This is done with the Crossover knob just above the speaker wire connections.
Whatever you have this set to, the main volume will now raise and lower the volume of the sub and main speaker together but you can still make the sub louder or softer as compared to the main speakers by using the subs volume control.
Defeat all tone controls on your preamp or receiver and use only the crossover knob and sub volume until you achieve a seamless blend where you cannot tell where the sub is and it is an extension of the speakers from where you will be sitting.
DO not evaluate from the sub itself because the room shape and acoustics are drastically different everywhere ESPECIALLY when you are dealing with bass frequencies.
I manage to slove to my DPX-U5120 Subwoofer level adjustment. In STANDBY mode, Press the Main Volume button and turn to Setting, turn until you find the SW Preout, Swith to normal mode, its won't work if u switch to REAR
Go back to CD/USB Mode, Then Press the Main Volume and find Audio Adjustment and now u can find the Subwoofer Level , Sub Phrase and Sub LPF adjustment.. Um Glad i found this and Happy Setting
You COULD run the Main speaker output to the large Red/Black speaker inputs, then some more wires Out from the other Red/Black connectors to your Main Speakers. That way your amp volume control will affect both equally.
Tweak the sub volume, crossover and phase to match it up to your mains.
It doesn't have a specific low-frequency or subwoofer output.
Depending on your unnamed subwoofer we may be able to work something out. Any sub should be able to work with a full-range Line Level feed.
If you use a Line Level input you won't have volume control of the sub through the receiver.
That would be available at either Tape Out or Aux Out. Just run an RCA pair (or combined to one male out if that's what the sub amp requires).
Whichever one you use, you won't be able to activate that function for listening as it would remove the input to the sub amp.
If your sub accepts speaker level High Level inputs you could drive it with speaker outputs and yoi WOULD have some volume control, assuming the sub had a way to match its initial volume to your other speakers.
Of course, the manual for your sub might explain some of this, too.
Have a good look at your set up in regards to volume output to each channels .
you may have only one channel working due to volume turn down or a faulty connection from the console head unit .
After going through all these , i would suggest to get your sub amp checked as you may have a faulty amp .
Try adjusting the frequency cut off of the sub and also play with the gain control on the sub. Turn your system up to where your front speakers are sounding as you like. Then try adjusting the sub to match the fronts so you have a good balance and blend.