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I like to listen to podcasts while I shower and I always use my iPad Air 2 because it's louder than my iPhone 6. And the iPhone 6 has been tested to be slightly louder than the 6 Plus.

The iPad's are louder than the iPhones.
 
Oh cheers for the reply man, yeah my iPad is louder that my iPhone and didn't know if I had low speakers or something haha. Thanks.
 
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