Connectivity issue (active sub, passive speakers, amp)
Some of the things you are asking about are confusing. But your situation is very simple and yes it can all work together.
I am not sure why you need to connect a laptop or record player to an audio card. You would plug each device into a separate input of the receiver. For example, the laptop would connect to the CD input, a computer can connect to the AUX, and a record player can connect into one of the others.
The amazing benefit of decent Denon products is they typically provide pre-out terminals. These are line level signal, but they are volume controlled. However, they are not amplified to a level as you normally need to drive a speaker. These pre-out terminals, at the very bottom of the unit, can be used to send a signal to the subwoofer. And you would use some music or YouTube videos to help you balance the speakers and subwoofer levels. After that, you use the volume knob on the receiver to control both the speakers and the subwoofer.
Just know it takes a lot of fiddling around to get the balance to your liking. Even then, it can change from song to song or video. It's not a science. You can get a microphone and REW software to help you balance, but I think it's a waste of time unless you have a dedicated theater.
This is my recommended configuration:
Many devices > Receiver > Speakers (using the speaker posts) and Subwoofer (using pre-outs)
Of course you need speaker cable to connect the speakers to the speaker posts. You can get ones with banana plugs on the end and they nicely fit into the back of the posts. And you would need standard RCA cables to connect the receiver's pre-out to the line-in of your subwoofer.
This method will still give you full control of the dials on the back of your subwoofer for adjustments.
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