How Do I connect a Samsung HW-H450 sound bar to a Toshiba 46SL417U TV?

Question edited for a lot more clarity.
Question moved to a Samsung Sound Bar category.

It is wireless and uses a non proprietary system according to this, so No.

https://eu.community.samsung.com/t5/audio-video/ps-wh550-sub-woofer-compatibility/td-p/3627892

https://www.google.com/search?q=Samsung+ps-wd550+sub

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OK, If its the Samsung Sound Bar, this item should have 2 HDMI input, 1 3.5mm audio jack input and a digital audio input (fiber optic). Since there are various input, the remote control should have a source button, or it will probably read O/A Input, this is to change thru the inputs from the sound bar. If you connected your TV HDMI output to HDMI 1 from the Sound Bar, then press the source button to reach HDMI 1, maybe it will be display with a different name, like sound 1, or DIGI.1 Give it a shot and let me know in the comment section. Good luck.

yes, hdmi cabels carries audio signals as well as video.

Really depends on what you're switching. If you plan on using a DVD, Cable/Satellite receiver, or more than you'll want to plug all those sources into the HDMI inputs of the TV. From the TV you'll want to run an SPdiF cable to the back of the sound bar. These cables can be had for less than $6 on Amazon unless you have one already. This is the simplest and cleanest way to use the soundbar as the TV's speakers. Go to MENU on the TV and select AUDIO and then turn off the TV's speakers. This will enable the SPdiF output to the soundbar.

Not sure why you would want to set things up this way, but you have to set the audio output in the receiver hdmi setup menu to tv. This will allow the receiver to pass audio info out of the hdmi jack. By default, this is turned off.

Because your TV is not Bluetooth-enabled and you are trying to connect it to a Bluetooth-enabled soundbar via Bluetooth. There are other ways to connect your TV to the soundbar:

1. analog AUDIO OUT (L/R) of your TV to the AUX IN on the soundbar (use a 3.5 mm.-to-RCA audio cable).
2. Optical OUT on your TV to Optical IN on the soundbar.
3. HDMI port to HDMI port (this may not work if your TV is not ARC compliant you have to try).

You get better sound quality with option 2.or 3. (if this one works for your TV)

Here is the link to download the soundbar's User Manual for help with the connections:

http://downloadcenter.samsung.com/content/UM/201411/20141114104022428/HW-H450-ZA-1114_Bookmark.pdf

Here is a link to your product description. When you get to the web page, click on the "Manual" tab to read the user's manual to find out how you can connect your soundbar to your TV.
HW H450 Wireless Audio Soundbar Samsung Home Audio

I think your set up is correct. The only other thing you may have to do is to set the sound on your TV to 'External Speaker' (or something similar) from your TV's remote accessing the menu.

HW H450 Wireless Audio Soundbar Samsung Home Audio

Click on the "Manual" tab to read hook up instructions, etc.

ook up to what? your tv? best way would be via optical cable