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Right now, the stereo is connected to power and the speakers are connected to the stereo and that's the only thing that's connected. So, either the 60 hertz hum is being picked up by the speaker wire which is unshielded as far as I can tell. Or are you saying the stereo itself could be poorly designed? Because that is probably the most likely thing with an Amazon stereo.
For some reason, this stereo only comes with a two-prong power plug, not a grounded one, so that's probably a bad sign.
So i could write an entire book here about this topic as ive spent most of my life around audio.
But the simple part is, even if its a 2 prong, you may still have a chassis ground on the metal casing you need to hook to an outlet plate screw or other ground.
The other issue could just be your house wiring. Some houses are not wired correctly and may not have proper grounding so you are picking up noise there.
The other issue is, cheapo pots (like volume controls) sometimes make noise when they are all the way off due to imperfect contacts being used in their build.
Speaker wire is always unshielded.
If you have a bunch of wires running parallel to 120v you'll get noise. If you have lot of cables coiled up you'll create an antenna and possibly pick up a radio station.
What make and model are these speakers? Its very possible they have a crossover in them with bad capacitors.
They are AR something from the 70s or 80s (?). They might have been built from a kit. I'll update when I get home.
I'll look for a ground conntector on the chassis.
I have other speakers in the house, which connect to a whole home stereo system with wiring in the walls, which have a very very slight hum at 0 volume, compared to these. That may be the whole house being slightly ungrounded? But it is different from my test setup, which has a noticeable hum.
This "test" setup is on top of the dining room table with the stereo plugged into a wall outlet via an extension cord. About 10ft each of 16 gauge twisted wire speaker cable connects the stereo to both the L and R speaker.
The stereo is this one: Daakro AK45 Stereo Audio Amplifier,300W Home 2 Channel Wireless Bluetooth 5.0 Power Amplifier System, Home Amplifiers FM Radio, USB, SD Card, with Remote Control Home Theater Audio Stereo System : Electronics
https://www.amazon.com/gp/aw/d/B0BX8TGZZF
Thank you for sharing your expertise!
I see! OK looking at that unit, it doesn't appear to have a separate ground. Although it does seem to be a low build quality which could be causing your issue. If you wanted you could try running it on DC power since that would be filtered, it could fix your issue.
Are the in wall speakers on a different amplifier?
I am leaning toward it being your house wiring or the amplifier. The speakers and their wiring are likely fine.
Yes the house speakers (almost imperceptible hum, with the wires in the wall) are amplified by an Onkyo Tx-8011, which goes through a Niles audio HDS-6 high definition speaker selection system, with the protection toggle always engaged.
For protection, it says:
Disengaged:
1-2 8 ohm
1 4 ohm
Engaged:
3-6 8 ohm
2-6 4 ohm
But honestly I don't have the users manual and I don't know what it means.
Back to the test setup (with the louder hum; speaker wire NOT in the walls, just draped over the dining room table), the speakers are AR18s, U028144. The 2 pronged plug is NOT polarized. I'll look for a DC power supply and see how that goes.
Looks more like bad design unless there’s a ton of other cables or if some of your cords/cables are in loops. I just checked my amp/preamp, and surprisingly they’re not using grounded plugs either, and it’s fairly high-end gear.
Only other thoughts:
Unfortunately, it’s been long enough since I’ve dealt with ground hum issues that the I’ve forgotten all the tricks. :( You might need to find an audiophile group. Because even cheap-ass gear shouldn’t do that.
I'll try the tricks! I'm betting the volume knob / potentiometer is a cause.
Update: twiddling the knob does nothing.