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On amps and speakers



Ohm = resistance,  the lower the number the less resistance. … car stereos 4 ohms home stereo 8 ohms*

4ohm speaker with 4 ohm amp - great
4ohm speaker with 8ohm amp - BAD
8ohm speaker with 4 ohm amp - OK not optimal
  
"Never use a speaker with an ohm rating less than what is recommended for the amplifier you are using. Because the lower resistance will allow more power back to the amp causing damage. (Higher is fine although not optimal.)
https://www.quora.com/What-is-the-difference-between-4-ohm-and-8-ohm-car-speakers

"Generally speaking, it's fine to connect higher impedance speakers to an amp; what you don't want to do is plug low impedance speakers, let's say 4 ohms, into an amp that specifies a minimum 8-ohm limit.

50 watts Continuous Power into 8 ohms," meaning the amp will output 50 watts into an 8-ohm speaker."
https://www.themasterswitch.com/how-to-match-speakers-and-amps

*In car audio, 4-ohm speakers are the norm. That's because car audio systems run on 12 volts DC instead of a 120 volts AC. A 4-ohm impedance allows car audio speakers to pull more power from a low-voltage car audio amp. Car audio amps are designed for use with low-impedance speakers. So crank it up and enjoy.
https://www.lifewire.com/speaker-impedance-3134705


Speakers in phase 

RED POSITIVE

Single stripe or dashed lines (these usually indicate the positive end)  - RED POSITIVE

The positive speaker terminal (red) on the receiver or amplifier must be connected to the positive terminal on the speakers, and the same applies to the negative terminals on all the equipment. Technically, the color or labeling of the wires doesn't matter as long as all the terminals match up. However, it's usually best to follow the indicators in order to avoid potential confusion later.
https://www.lifewire.com/quickly-test-speaker-connections-3135135

Testing polarity of speaker wire
Speakers, speaker wires, and batteries all demonstrate positive and negative polarity. 
To test speaker is working…If attached to speaker pick up a speaker wire and hold one of its ends to one battery terminal (either + or –). Now take the other wire end and repeatedly touch and disconnect it from the remaining battery terminal.

 If the wires don't provide any clues to polarity, you can figure out which is which by the way the speaker moves. Observe the cone each time you brush the wire against the battery. If the cone moves out then in, the polarity is correct. If the cone moves in then out, reverse the wires on the battery and test again. 

AMPs we have 
Digitec Amp: 18w per 4 Ohms speakers….

Nob sound ( just bought)
Output power: RMS 100W×2(4Ω, 20Hz - 20kHz, 0.04% THD
https://www.amazon.com/Nobsound-Channel-Audio-Amplifier-Digital/dp/B07CXNJ2L3







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