What do I need to connect my iphone 6 to a Bose SoundDock portable speaker?

You can use the Audio In with a 3.5mm audio cable, ro if you wanted to maintain usage of the dock, you can try one of these:

Lightning to 30-pin Adapter - Apple

or

Lightning to 30-pin Adapter (0.2 m) - Apple

Presumably the SoundDock does not have Bluetooth but does have an AUX input, so your options are a cable (3.5mm headphone to RCA), or if you want a wireless connection look for a Bluetooth receiver to plug into your Bose, or an AirPort Express or Apple TV if you want to connect via AirPlay.

Without knowing what the speaker has in the way of inputs. It's impossible to answer that beyond a guess.

As rocky points out, likely a 3.5mm to 3.5mm stereo cable would be the easiest option.

We can be more accurate if you identify the exact model of speaker or at least its inputs or connections.

Hi

Just turn Bluetooth on in settings on iPhone Then press Bluetooth button on sound dock leave them to pair together.

Cheers

Brian 🇬-1F1E7;