Subwoofer I purchased the HTP-2950 and can not get the subwoofer to work. All other speakers work but he woofer does not. Checked the connections and it seem to be making good contact. Instructions with the system is very poor.

3.5 m/m. Normally it is color coded green. The pink connects the subwoofer to the speakers. Any color will work. Just mark both ends of wire jacks.

Look around for a subwoofer which has speaker level inputs.
Something like this;
https://www.parts-express.com/dayton-audio-sub-1000-10-100-watt-powered-subwoofer--300-628

Unfortunately, the most common problem with powered sub woofers, including definitive technology, is that the capacitors inside dry out. To check the speaker, you can connect any line level audio source (like an mp3 player) to the speaker and see if it comes on. If it does come on, then you will know the speaker is ok. If not, then the speaker will need servicing. Powered sub woofers are not usually a DIY project.

Recheck your wiring and instructions. If your woofer is self powered perhaps the amp is no good. Actually it better have amps since the laptop output will not power those speakers.

If the subwoofer has its own power cord seperate from the rest of the audio system, the internal amplifier could be fried or u have a loose connection inside the box

You need to buy an active (self-amplified) subwoofer. Attach it to the Subwoofer Preout connector.

Go into Speaker Setup (SP SYS/SETUP Button near upper right side of Op Panel) and follow the prompts.

The parameter we're most interested in is the question "Subwoofer Yes" or "No".

Some guidance when selecting speaker parameters for the rest of the channels:

SMALL vs LARGE: This has nothing to do with size so much as it deals with the BASS handling capacity of the speakers. If you say SMALL, most low frequencies from those channels will be re-routed from them to the Subwoofer. If you say LARGE the channels will still get the low frequencies they deserve.

I imagine you would be able to answer LARGE for all of your speakers.

Even if you have all LARGE speakers defined the Sub will still have work to do as it will be dealt the LFE (Low Frequency Effects) from encoded movies and all or most of the content below certain frequencies.

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.

Let me know if you have any other questions.

cheak setting in sterio out put for sub on ect does woofer have sperk wire going in and out use them then ok

This means that you have purchased a three piece home theatre system. Two tweeters and a sub-woofer. Assuming you are using a Stereo player (Tape/CD/DVC)you have to connect the Left Output of the Stereo placer to the Left Input at the back of the Sub-Woofer and the Right output to the Right input of the subwoofer by cables. Then take tweeters and connect them to Right speaker and Left speaker output at the back of the sub-woofer ( note if the speakers are marked L/R, then connect them to the subwoofer output accordingly. In case you are using a 5.1 player, then only connect the front right and front left to the Right and Left input at the back of the subwoofer. You are and you can now start playing your music or movies and and you will get theatre quality sound.

Go to the following website www.servicemanuals.net where you can get the service manual for $17.00, unbelieveable, don't you think? The service manual should help you sort out your hookup problems. Good luck.