I found a pair of Aiwa SSX-VX77F tower speakers in my uncle's garage. They have two sets of connections (for different speakers,I guess). Anyone have an owners manual they could share, please?

Just undo the wires and connect them

https://www.google.com/search?q=Aiwa+WNA909&

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One pair for low frequency and one for high. U could put them together one each n use it normaly like any speaker ok

Your powered subwoofer should have two different pairs of inputs - one is a line input that is connected to a subwoofer output on your amp. The other inputs are those that are directly connected to the existing speaker outputs on your amp.

When you have all working make sure that the sub output is in phase with your other speakers lest you have bass cancellation.

It's the woofer that will use almost all from this 150 W so if you replace woofer take one of 8 ohm which can handle 150 W and you done

Many Bluetooth devices can only remember a certain number of device pairings. Speakers and headsets typically remember only one or two devices, and forget the previous ones.

Re-pair your speaker to the iPhone.

You should be able to use any decent pair of speakers with an impedance between 8 Ohms and 16 Ohms and maximum power capability of at least 33 Watts. The link provided is for the specifications page of the owner's manual.
http://audio.manualsonline.com/manuals/mfg/aiwa/cxnhmt75.html?p=31

In general, speakers don't connect directly to a DVD player (model unknown) as DVD players generally have no way of amplifying a signal to speaker level.

Assuming the speakers were self-powered, you would not be able to control the volume since DVD players generally have no output controls.

I have found nothing online that matches "aiwa 2.0" as a unique speaker model.

Can you re-describe the speakers and the DVD player piece?

Picture tube is magnetized. Manual degausing is required. already you have done this.

Since you say it is reappearing, you have to check the following.

1. Relocate the TV or relocate if you have placed any tower speakers
or home theater speakers close-by.

2. Check whether auto degauss functioning OK. In the MENU
check whether you switched off auto degauss option. If it is OFF
enable it to ON.

3. Finally re orient the direction of your TV and watch the rainbow
effect. Switch OFF TV, wait for 20 mts, and again switch ON.
Repeat the process. It should disappear.

Magnetic toys or any other devises using magnet will cause this problem.

One pair goes to bigger speaker (woofer) and other pair for smaller speakers in box, to get full frequency response, you need to hook both cables.

I'm guessing that you have Bi-wireable binding posts on the back and your jumper straps are not installed. You'll be able to tell if they are biwireable if there are 4 sets of speaker connections vs the standard two. When you are only using one set of speaker wires you need to have metal straps installed between the upper and lower pair of connections so that all of the drivers are getting signal.