SOURCE: dhd ntx 2009
With two 4 ohm svc subs and a 4ch amp the best way to hook it up is as you have described. There is no way of wiring it to get a lower ohm with your set up.
SOURCE: Hooking up speakers to amp
YES ! This is usually ok, the speaker cabinet should contain a high pass filter or crossover on the tweeter to decouple it from the low frequency signals. My Linn Index speakers are wired like this.
SOURCE: component speaker not working
The easiest thing to test is to try swapping the connections of the front component speakers at the amp connections. If the problem follows the speakers, the issue is probably with the speakers. I would triple check (again) the speaker wire connections. It's also possible the crossover for the driver side component speakers has an issue (thus why the tweeter worked for a while).
If the problem stays on the drivers side, the issue is probably with that channel on the amp. Triple check the RCA connections for that channel.
It's much easier to test other speakers on an amp channel versus trying to check it with a meter.
If the driver's door is "abused" often, my initial thought is the wiring at the speaker or the wiring in the speaker (to voice coil, within the crossover, etc) is the most likely culprit.
SOURCE: how to hook up 2 10 inch speakers
For best results the output resistance of the amplifier must equal the combined resistance of the speakers. So if the amps says 8 ohms and you have two 4 ohm speakers you put them is series or if the amps says 4ohms and you have two 8 ohm speakers put them in series. If it says 4ohm and you have two 4 ohm speakers best to use only one. It Depends on the output resistance of the amps. It is usually written at the terminals where the speakers are connected.
SOURCE: multiple speakers on zone 2 0r 3 speaker output terminals
I wouldn't hook anything up except what Yamaha recommends to the speaker output terminals. That's pretty much asking for trouble!
barneyluc
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