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input and output are for low level ( as with RCA cable connectors) ,, the speaker connections are for high input, (red and black connections. ) you can run the mains to the (rca) from your receiver to run the sub woofers, and from that use the speaker wire connections, to go to the left right speakers, (out only not in) this is done if you want to run the subs and the Rt/lt/ speakers , eliminating the speaker connections coming from the receiver. which you could use for 2 additional speakers if you want
Follow these steps to connect a powered sub woofer to your receiver:
You typically have two options when connecting a powered sub woofer.
Input (1) on the rear of the sub woofer would be used when connecting
the sub woofer to the receiver using speaker wires. You would then
connect the main speakers to the opposite end, or output or the sub
woofer to the main speakers. Option (2) would be using RCA line level
output jacks, input (2) on the rear panel of the sub woofer directly to
the single sub woofer output on the back of an AV receiver.
Depending on the model, there are two ways to connect a subwoofer to an amplifier, receiver or processor. The best way is to connect the subwoofer to the SUB OUT or LFE output of a receiver, but some subwoofers can be connected to the speaker level outputs of the receiver or amplifier.
1. How to Connect a Subwoofer to the Subwoofer Output
The preferred method of connecting a subwoofer is through the LFE or Subwoofer output (SUB OUT) of a receiver. Almost all home theater receivers (or processors) and some stereo receivers have a subwoofer output. The LFE (Low Frequency Effects) is a special output for subwoofers and is often labeled 'SUBWOOFER' not LFE. 5.1 channel programs on DVD discs have a dedicated .1 channel output with bass-only content that is best reproduced by a subwoofer. Connect the output of the LFE or Subwoofer jack to the Line In jacks of the subwoofer using a single RCA cable (the two jacks on the left in the photo). A 'Y-Cable' may be necessary to connect the LFE output to both the left and right channels of the subwoofer.
2. How to Connect a Subwoofer to Speaker Level Outputs Some receivers and amplifiers do not have an LFE or Subwoofer output. In this case you can use the speaker outputs of the receiver to connect the subwoofer. Using speaker wire, connect the left and right channel speaker outputs of the receiver to the left and right channel speaker level inputs on the subwoofer (the speaker inputs on the right side of the photo). Using speaker wire, connect the left and right channel speaker outputs on the back of the subwoofer to the left and right channel front speakers.
Your receiver delivers an unchanged power through its single line out jack. Therefore, if you use a Y cable to connect 2 speakers to that jack, the only thing you will get is to divide the power between the two speakers. Besides, I would not recommend this trick, as the nominal impedance would be strongly mismatched, putting in risk your system. The best solutuion seems to connect an extra amplifier to your receiver line out, and then connect extra speakers to that amplifier.
On the back of the receiver, there could be "pre out-subwoofer". If your subwoofer has the same type cable input, that would indicate it is a powered(amplified) sub. Connect those two. If subwoofer only has red/black speaker inputs, it is a passive sub, which means spkr signal runs thru it and then to your main left and right spkrs.. Run your receiver main or front spkr left (red/black) and right (red/black) to those corresponding sub inputs, and then sub spkr outputs to each of your main left/right spkrs..
For surround, on the back of the receiver, there should be spkr outputs (red/black) noted as "rear".
Hi, You don't need such cable, although you can use it if you have one. If receiver has only mono SUB output (as majority of receivers have), you just connect it to the Left socket on the Sub and it will work.
Using the Y cable would probably cause that you will fed the same signal to both left and right sockets, but half the intensity (you would divide the output from receiver by 2). So in the end the Sub would receive exactly the same signal as when using normal straight cable.
The problem was that some subwoofers (inluding my velodyne model) cannot process the LFE signals through the line level inputs on its amps, so the other way to run your subwoofer is to run the front left and right speaker outputs from your receiver to the speaker-level inputs on your sub, and then plug your front and left speakers into the soeaker level outputs on the sub. you have to set the onkyo receiver to "Subwoofer: No". that way the LFE signals are sent through the front speaker channels and you will get the same BASS output as if using the line-level input. O So yes it does require a bit more speaker cable, but it works fine now.
Just use the left input on the sub. The sub frequency components are generally across both channels, the left and right are to allow for easier integration with systems that have no specific sub output, a low pass filter is applied to the audio, left and right get mixed, and then feed to the subs internal amp. I advise for performance to use line level(low level-NOT speaker) inputs wherever possible. If you have any other questions, I am here to help ya. A "FixYa"rating would help my profile. Thanks.