Just bought some passive waterproof speakers to be ceiling mounted in the bathroom. They're 80 watt, 8ohm, pretty bog standard. The problem is this - when we have e.g. an iPod plugged into a cheap Bluetooth speaker via a 3.5mm audio cable, it produces an acceptable volume. However, when we connect the wires for the bathroom speakers into a headphone jack and plug this into the iPod, it is considerably quieter, not really loud enough at all.
The speakers certainly have enough power, so is there something else causing the issue here? Could e.g. the Bluetooth speaker have an inbuilt amp, hence why that is loud enough? The speakers were only cheap, so we don't want to go spending loads on an amp - plus there's the issue that if we needed an active amp, that would mean messing about with batteries/power cables in the attic, which is a lot of hassle. Are we just best to return them or is there a simple solution here?
We'd want to be able to play the speakers from a 3.5mm jack so that we could connect it to phones/iPods etc. Any help/advice much appreciated, thanks.