u/Civil-Raisin-2741

I got 2 free Bose speakers that are rated 50W each, I bought a ZK-502MT 2.0 amplifier and when using the aux-in in there is constant static noise/buzzing from both speakers. The sound is not bad, but the static is annoying especially when watching movies in quiet scenes.

What can I try to fix this?

The setup is:

• ZK-502MT amplifier
  • plugged into desktop via (shit) 3.5mm jack aux cable
  • powered by laptop 18.5V 4.8A power supply that has a ferrite core near the end of the cable
  • volume knob on amp at 80%
• 2.0 Bose 141 speakers
  • connected to the amp using CCA cables

Behavior is:

• If I unplug the aux-in from the amp side speakers are dead quiet
• Increasing or decreasing volume from the amp also increases or decreases the static noise
• On BT if I play a song and pause it there is static noise for a few seconds then drops to dead quiet. If I play something quiet the static noise is also there. But this noise seems much more like interference than the static the aux-in gives, they seem like different noises to me

I tried:

• Plugging aux into another PC (laptop, unplugged from AC), same static noise
  • A thing to note is that my PC PSU is very shit, with earbuds plugged in sometimes when I move the mouse I can hear some weird noises, this didn't happen with the previous good PSU I had. As I tested with another PC and the situation didn't change, this is most likely not the issue right now

From what I've read here I could try:

• Different aux cable, as the current one is pretty shit
• Buying a 3.5mm jack ground loop isolator, but I'm not sure if it applies to my case

Any pointers? I'm a newbie at audio stuff and electronics so idk really

Edit: a half-solution I found would be to set the volume on the amp very low until the noise disappears and put the volume to the max on the pc, but it's too quiet

I have 2 slots, I want to make these two have the same length (the 20mm) so that if I resize one the other is resized too. I also want them to do this for the radius and all other properties.

Another problem I have is that I'd like to have both slots aligned vertically to the center of the rectangle (50mm/2) but I can't find a way to do that. If I use the symmetric constraint on the top 2 edges and the top radius of the top slot then the radius is attached to the top line of the rectangle (in the middle), but I want it to be 10mm away from it, not on the line itself.

I wanna make the top and bottom slots both 10mm away from the top and bottom lines of the rectangle, but how to enforce that? I don't wanna hardcode every single number when it's symmetrical

https://preview.redd.it/4j8doaz7fk0h1.png?width=456&format=png&auto=webp&s=f85cc4f0f636b2b8c746f3376eb402c75b9c843b

Edit: this is how I can do it, but there's many duplicate things, how to not do this? I watched many videos on constraints but I feel dumb as hell not figuring it out. I would like for some distances to be dynamic, for example if I increase width from 50mm to 60mm the slots should be 30mm away from the edge horizontally not 25mm as it's hardcoded now

https://preview.redd.it/kx1a70spgk0h1.png?width=514&format=png&auto=webp&s=736b85f75f9b3120efbcf38988456f1c5224d6fb

I would like to make a few holes in the back of the speakers to put them on a wall arm but the 5 holes in the back seem to have plastic rivets instead of screws, what can I do?

Is there no way to tear these apart without breaking something?

Also, would making a few holes in the back change the audio quality? What about holes on the side with a different mounting arm?

front of speakers

rear of speakers

close up of one of the 5 holes

Thank you

Total newbie here. Got for free two Bose 141 speakers but I don't have the stuff to make them run, what's the absolute cheapest I can spend to make these work without too much static noise and acceptable audio quality?

Speakers are rated 50W max each. I think I need a >=100W amp and power supply. I found some amp options:

• 4$ TPA3166 board 120Wx2 how?
• 20$ TPA3251 board 220Wx2

If I understand correctly: I can get one of these boards, plug the speakers and power supply, plug the board to the pc, and it should work?

I don't really want to spend more than 40$ total for running these speakers as they're not good.

Thanks