How it matters to you is that 2 ohms is less "resistance" than 4 ohms.
Specifically, it is "less resistance" against current flowing through a circuit.
The lower the impedence (or resistance), the more current will flow.
And, the more current flows through any electronics, the more heat is produced.
What makes a fuse blow? Too much current flowing through it, right?
Why does it blow? The element melts - heat.
This is important in car audio, because you don't want your amp internals to melt, by hooking up too low of an impedence to it. It's not just fuses that melt.
...which is why amps are rated as being "stable
down to..." a specific impedence. 2 ohms, 1 ohm, whatever. You don't want to hook up a lower impedence than what it's been designed for.
Speakers come in many impedences (plus, you can wire them in combinations to either double, or halve the impedence for each combination of two you connect) so that you can wire them to the proper impedence you need, given whatever amp it is you have.
How it matters to you is that 2 ohms is less "resistance" than 4 ohms.
Specifically, it is "less resistance" against current flowing through a circuit.
The lower the impedence (or resistance), the more current will flow.
And, the more current flows through any electronics, the more heat is produced.
What makes a fuse blow? Too much current flowing through it, right?
Why does it blow? The element melts - heat.
This is important in car audio, because you don't want your amp internals to melt, by hooking up too low of an impedence to it. It's not just fuses that melt. ;)
...which is why amps are rated as being "stable [i]down to[/i]..." a specific impedence. 2 ohms, 1 ohm, whatever. You don't want to hook up a lower impedence than what it's been designed for. ;)
Speakers come in many impedences (plus, you can wire them in combinations to either double, or halve the impedence for each combination of two you connect) so that you can wire them to the proper impedence you need, given whatever amp it is you have.