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It depends on the speaker and receiver inputs/outputs. If The speakers have bare wires, and the receiver has spring clamps, you are in luck! Check out what I mean by spring clamps in the image linked below. If you can give the model number of the receiver and describe the wires coming from the subwoofer, I can help a lot more.
I don't recall correctly if your Pioneer has a sub out RCA connector, and if the Kenwood SW-07 has a low level input. So the usual way is to connect it using the speaker wires.
You connect either the FL or the FR to the sub and it should work.
if you have your front and centers set to 'small' you want your Bass out to be subwoofer only, and the rca jack labeled 'sub out' is the only place to connect your sub to if you want to control the frequencies with your reciever. I dont know the brand of your sub, or the inputs on the back of it to advise you where to connect, but it sounds like it worked for you at one time, but suddenly it does not
On the back of the sub woofer you have two sets of binding post / some have spring clip terminals ( red & black ) labeled Speaker In ( sometimes High Level In ) and Speaker out. Take 2 pairs of speaker cables and connect one end to the speaker out socket of your amplifier ( left & right ) . The other end of the cable should be connected to the sub woofer's Speaker In socket , Red to red and black to black. Now on the Speaker Out socket of the sub woofer connect your existing pair of speakers using another pair of speaker cables. If your sub woofer has a Hi Pass filter built in , you may not hear bass coming from your existing speakers with this kind of connection. Good if you have small satellite speakers.
The connection on the receiver would be the sub woofer out. Not a sub woofer out LFE, a sub woofer out with speaker wire connection. From there you plug it in to the top section of the available terminals on the sub you are referring to (speaker level input). One in positive and the other in negative matching what you did on the receiver with correct ends. The speaker connections underneath the top connections is for additional speakers like surrounds to be able to be connected directly to the sub woofer speaker level out for sound. This of course would be for an older receiver connection. I do not think it is possible to convert this connection to an LFE and have it work properly. If the receiver does not have sub woofer speaker connection and only a RCA out then you can try to connect both rear speaker connections from the receiver to the speaker level inputs on the sub and then connect your rear speakers to the speaker level output on the sub to power them. This is an active sub woofer but for some reason they made it connect as if it was passive. I am not sure if this sub is designed for really low frequencies required for movie or if it is better for music.
You need to use an amplified sub. The Yamaha receiver is only sending "Pre-Amp Signal" not amplified audio like the rest of your speakers. If your sub has a crossover built in, connect it's speaker level (wires) to the "B" side of the receiver which will send audio to your sub and it will cross it over internally. Not the best sounding, but it works. Amplified subs range in price from 200 and up. Hope this helps
Your receiver should have an RCA connector on the back panel that will be marked "sub woofer" or "LFE out". That connects to your sub woofer with a standard RCA type cable. Also, some powered subs have left and right speaker level inputs and outputs in which you would indeed run the sub woofer through the speaker outputs. The down side of that type of connection is that the line level converter inside the sub woofer will take a slight amount of your receiver's output power, although that is rarely detectable. Also, if you have a Dolby Digital receiver, using this connection method will take away systems ability to accurately control the low frequency effects of a soundtrack.
Get a powered sub-woofer that has speaker level inputs, then run your front speaker wires into the sub-woofers speaker level input and then run a set of speaker wires from the sub-woofers speaker wire output to your front speakers. This is a common way to use a sub-woofer with a receiver that doesn't have a sub-woofer output.
Most powered sub-woofers have these connections, just check it out first before you buy one. They look like speaker jacks on the back of the receiver.