I have yamaha receiver rxv365 and yesterday i bought subwoofer yst-fsw050 but it doesnt work. Does that type of receiver automaticly recognize sub or must I do something on te setup? Thanx

Question edited for clarity, full make model (what it is)'.
Question moved to Yamaha Audio.

It may be sympathetic vibration and is coming from something nearby. Put it on a folded towel or sit in the floor to test it.

https://www.google.com/search?q=YST-FSW050+bad+vibration

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If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
Search the site by type in the "brand name" to your device; (Exclude the model number), in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

The Yamaha has probably got a setting to switch off the subwoofer port. Look up speaker settings in the user manual.

most yamahas have a setting to lower main speaker volume 10 db, accessed by the remote, or front panel controls in the settings.this is a very small sub, only a 6.5 inch driver and 100w.
sub placement in regard to the seating position is very important in order to get good bass response.

The problem is the Ic or transistor use a tester

It's a standard non-proprietary standalone self-powered sub that accepts any input one could want. Your unnamed electronics will be the determining factor. Manuals spell it all out.

http://www.retrevo.com/support/Yamaha-YST-SW45-Subwoofers-manual/id/320bh343/t/2/

i am wanting to know the answer to the exact same question. did you ever find the answer?

use the left input on the sub. It acts as the main input. Hope this helps

Turn the sub on, then touch the end of the sub lead when you take it out of the back of the amp..it should buzz to show the sub is ok . If the sub is ok then go through the setup on the Yamaha and tell it there is a sub connected in the speaker setup.

Hi,
Here you can find the manual for your subwoofer. Looking at its back side, it has 2 RCA plug input for stereo. Receiver has just mono sub output, but as low frequencies are not easily locatable, mono is perfectly OK.
Just connect receiver SUB-OUTPUT with RCA cable to your subwoofer's RCA LEFT input. Then adjust volume to match rest of your speakers.