Overall works great. Of these were large Klipschs with a 10 inch subwoofer and one was a smaller Insignia computer speaker but also had a subwoofer from my iPhone. The two Klipsch speakers worked well, but the smaller Insignia unit suffered a bit and didn't have the same volume as usual. Probably the voltage / resistance / amplifier balance problem is more related to unequal demand than the actual structure of this product, and is a simple three-wire splitter, not an integrated amplifier. For the price, you can not win.
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