Is it fine to connect Bose speakers & Bass system to LCD TV with an adaptable cord? Without a proper receiver?

The only problem will be controlling the volume. If your TV has a headphone jack, you are all set. Just get a 1/8 inch stereo to RCA cable. If you don't have a headphone jack, and the TV does not have a "variable audio output", you can try the audio output on the TV, but it will be at full volume all the time. If the Bose speakers have a way to control the volume, it will work.

The bottom line is this...computer speakers are really not meant to be connected directly to a TV. If you are not happy with your TV's speakers, the best thing to do is get a home theater receiver and speakers. They are designed for that purpose and the volume will be easily controlled.

Those are computer speakers but should pose no problems to your television. The only thing you should be checking is if the bass module is magnetically shielded, which will distort your picture. Im not sure if that is even a concern with LCD but just to be on the safe side i would keep the bass atleast three feet from the screen.