Insignia NS-PDVD10 Speaker Volume Control

The manual mentions nothing about a 'Volume Safety'.

https://www.manualslib.com/manual/282784/Insignia-Ns-R2001.html?page=9&term=volume&selected=1#manual

No one else has heard of it either.

https://www.google.com/search?q=insignia+NS-R2001+%22volume+safety+control%22

..

The installation of a volume control will not make the speaker louder, for that you need a speaker amplifier, check the web for them I have one for my headphones, found it on ebay, Check under headphone amps.

Headphone socket connection fault. Not cuts off the internal speaker. Replace the socket with an identical one.
Electro help

1. Try looking in the taskbar of the Windows screen and selecting the volume control ( a speaker icon) check the mixer see if the volume is not muted or in the "0" position
2.Check the "input port on the sound card where you connected the new speaker assembly.
3. Check the volume control knob on the speaker assembly to see if it is not in the off or lowest volume position.
4. Check the new speaker by connecting them to another computer that has the sound already on and working this will let you know that the speaker assembly is good.
6. check the sound card drivers to the internal sound card that is on the mother board if this is where your sound card is located. Use the "manager" to see if it is working properly. If not then do a "reinstall of the sound card drivers or use the "update feature in the hardware window for the sound card to install the latest version of sound card drivers.
I hope this helps. Have a great day!

As an idea, I was thinking as I read your post, I thought that this would be an ideal application for a pair of "Wireless/Ired Headphones", you could plug these into the headphone socket, and then use these to hear your sounds, these units have a mute on board.
You could indeed wire it into, the unit going in through, the back of the, set. You could wire it up, but in reality, it would be better to use a third party device and that way would not compromise any warranty.

Double click on the volume control at the bottom right corner of the screen or go to control panel (by clicking all programs or windows logo) and choose Sound And Audio Devices. When you are in the volume control panel box, make sure that all volume controls are at its maximum. If this doesn't work, try a different speaker or a headphone. If your speaker/headphone has volume control, set it accordingly. If still nothing, reinstall the driver for your audio device.

Unfortunately, I believe this is by design. The knob does not control the volume of the headphone jack on those speakers. The best you can do is set the volume control in Windows so that the headphone volume is acceptable and turn the knob up higher for speaker listening.

Unlock
Insignia NS pdvd10
It`s really works

1) On the remote control type "SETUP" button
2) Select "PREFERENCES" in the menu with
3) Validate it with the button "OK"
4) Enter the code : "224455"
5) With the direction keys type:
a) Left key : < (Nothing happens)
b) Down key : v (a menu appears on the screen
with all region)
6) Select the Region : 0 (all) with the direction keys
7) Validate it with the button "OK"
8) Finish the process by typing the "SETUP" button.

If it has always done this, then there might be a problem with the speaker board or the hedphone hack (the headphone ports are designed to disconnect the speakers when a plug is inserted).

If this is a recent development, try shooting some canned air into the headphone jacks and see if it doesn't free up the contacts.

Unlock
Insignia NS pdvd10
It`s really works

1) On the remote control type "SETUP" button
2) Select "PREFERENCES" in the menu with
3) Validate it with the button "OK"
4) Enter the code : "224455"
5) With the direction keys type:
a) Left key : < (Nothing happens)
b) Down key : v (a menu appears on the screen
with all region)
6) Select the Region : 0 (all) with the direction keys
7) Validate it with the button "OK"
8) Finish the process by typing the "SETUP" button.