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What is bad for speaker/amp ?

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What is bad for speaker/amp ?
#1
I'm curious about something, can't get a clear answer from google ..

What is bad for speakers and/or amplifier:

1. 8ohm speaker connected to a 4ohm amp

2. or a 4ohm speaker connected to a 8ohm amp

(maybe 'ohm' isn't correct spelled here, but i'm talking about the 'resitance' or 'omega' ..)

Thanks!
linkmark
#2
1 is ok you just get half the wattage
2 is not your amp will run hot and eventually die
#3
Great, good to know. thanks !
#4
this is out of experience...

If you drive a lower rated spk with a higher rated amp,
eg a 6ohm spkr with a 8ohm amp, the sounds seem to be deeper and softer
While if you use a lower rated amp with higher rated spkrs,
eg a 4ohm amp with 8ohm spkrs, the sound is really hard, and the base is stiff and knocking, its also slightly distorted

Just a few things ive noticed over the yrs
#5

%1$s a écrit If you drive a lower rated spk with a higher rated amp,
eg a 6ohm spkr with a 8ohm amp, the sounds seem to be deeper and softer


you hear it "softer" beacuse you are saturating the speakers with more signal than they can handle.
this way you are compromising the life of your amp.

%1$s a écrit While if you use a lower rated amp with higher rated spkrs,
eg a 4ohm amp with 8ohm spkrs, the sound is really hard, and the base is stiff and knocking, its also slightly distorted


this looks more like a broken amp...