Yamaha SW118V Subwoofer

The sub channel will be switched off. You need to find the speaker settings, locate the sub channel settings and switch it on.

Parts from all-in-one packages like this aren't inended to be pieced out to other applications. Proprietary connections are a huge clue and disincentive.

http://www2.yamaha.co.jp/manual/pdf/av/english/sys/NX-P150_e.pdf

A look at other Fixya queries gives this answer:

http://www.fixya.com/support/t4959365-yamaha_sub_woofer_model_nx_sw150

"I have this sub. The system connector jack needs a 12V DC signal to turn on. If you don't have a suitable Yamaha receiver with this connection, use any 12 V DC adapter with a 1/8 in mono plug (the tip should be positive)."

I imagine the subwoofer could be opened up and whatever circuitry is enabled by the Control signal could simply be jumpered "true" so it is always ON. That would mean the amp would be drawing power at all times, though.

Register and download the manuals for free at retrevo.com

http://www.retrevo.com/support/JBL-ES150P-Subwoofers-manual/id/7098bh340/t/2/

Have you tried just turning the subwoofer amp

Just for clarity, I need to explain what the four inputs are on the KEF subwoofer. There is a left and right RCA input which is the input signal to the subwoofer and there is a left and right RCA output which is the High Pass output from the subwoofer.

On the back of the Yamaha receiver, you said you have a subwoofer output. This output is most likely the mono subwoofer part of the home theater system and can be used if you like. The left right signal input into the KEF is summed into mono so if you only connect one channel you will basically reduce the signal level by 1/2 (-3dB) but it will work fine.

Alternatively, if your Yamaha receiver has monitor out and monitor in, you can run the monitor output signals to the subwoofer and you can then run the high pass outputs from the subwoofer back to the monitor in. This will give you the subwoofer and provide a smoother signal matching with your audio system.

It is not always easy to connect the subwoofer up to an integrated receiver/home cinema system using the high pass channels of the subwoofer as you don't always have access to the analog output and input of the front channels. In this case, just use the Subwoofer output or just the monitor out only.

I hope this solution is helpful.

Poly Switch
All full-range loudspeakers are fitted with a self-resetting
poly switch that protects the high-frequency driver from
damage caused by excessive power.
If a loudspeaker cabinet loses high-frequency output, immediately
remove power from the unit and wait for two to three
minutes. They should allow the poly switch to reset. Reapply
power and check the performance of the high-frequency
driver before continuing with the power reduced to a
level that does not cause the poly switch to interrupt the signal.
On the SW115V/SW118V/SW218V sub woofer, the Poly
Switch protects the woofer and a similar routine should be
followed if its output is lost.

It sounds like you have switched off the sub channel.
Keeping pressing C Level on the remote till you see SWFR.
Press D l / h to adjust the speaker output
level.

The front channels could still go out if one of them
is going out as the relay will shut em both down if it senses a problem! Check also for bad solder connections too!

I too have amplifier and speakers thatI rent for parties, and sometimes when I connect them they don't work and I battle with them for hours before I find the out that its just a little thing that happened, like speaker wire might have cut inside, or the wire conneted for the CD to Amplifier is bad and son on.

But I will advice that you test your amplifier and woofer, with another equipment independently to be sure if they still working well or not. As this will help you to know what to do next.

May somthing happened to one of them the last time you used it and you did not notice, and it might just need some servicing.

Best wishes

Well, as I know, your Cerwin Vega subwoofer is designed for use with stereo systems. Therefore, it has only 2 channels for input, and 2 channels for output as well. However, you can try this out; the first thing I suggest is that you hook up your main front channels through the subwoofer. All you have to do is to connect the subwoofer input to the front channel output on the amp, then hook up your front speakers to the satellite output on the subwoofer. As long as you make sure that system is working on 8 ohms, I believe this can activate the subwoofer.