Electronics > Beginners

Can I connect a 100W subwoofer to the 40W+40W rear speaker outputs of a stereo?

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james_s:
Why not just spend $20 or so on a small sub amp and use the actively filtered sub line out that almost every head unit has?

Zero999:
It might not even be necessary to cut the high frequencies to the woofer, which could have a poor treble response anyway.

AVGresponding:
It will have a poor treble response.

Generally crossovers are only needed where you need to power share between different frequency range speakers on the same output. Using them with a single speaker just wastes power.

As has been already mentioned, don't connect outputs together, they are almost certainly already bridged. Though some can be connected together depending on the amp configuration, this almost always involves bridging front and rear on each side.

Dual voice coil subs are easy enough to find, this is probably the simplest solution.

Audioguru again:
Almost every speaker "shrieks" at its cone-breakup frequencies. You do not want to hear the shriek frequencies of a sub-woofer.
Here is a typical small 4 ohms 100W sub-woofer:

AVGresponding:
Given the OP's intention to use it in lieu of rear speakers, I'm not sure it would be hugely noticeable, especially if it's going to be in the load area, covered over with a parcel shelf etc.

One could always stick some old chewing gum on the dome/cone joint to interfere with this resonance   :box:

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