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Is it possible to remotley adujust volume on Bose Companion II speakers?

i want to use my Bose Companion II speakers as my TV's main speakers. I currently have the directv box connected directly to the tv using HDMI then i have the bose speakers connected to the headphone jack on the back of the tv. needless to say this set up isn’t ideal. The volume isnt as loud as they can be. i have connected to speakers directly to the directv box using A/V cables and the audio was 10 times better the only problem with that is i can only adjust the volume using the knob on the front of the speaker itself. i did a mock up of what i think will fix my problem i am just unsure what i need to do it right. any insight will be appreciated.

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