This is about my Iphone 6 plus I got a few weeks ago?

I just got my new iPhone 6 plus a few weeks ago, and it, s been working well since then. But I realized just now as I play my music, my loudspeaker sounded not good. It sound perfectly fine with the earphones. And I have never dropped it or got it wet. I just don't know what to do. I Really NEED Help.

Contact AppleCare or the shop you bought it from

If the speaker has always sounded that way maybe there's nothing wrong with it and its supposed to sound that way. Your question doesn't adequately describe how it sounds so it's anybody's guess to say why it sounds "that" way.

Do you have the phone in a case? Maybe its blocking the speaker.

In the future you can increase your chances of getting a good answer by including your question in the question header, or at least something about it. Millions of people have the iphone 6.

Highly probable that something must have gone inside the speaker grill, if that's the case enclose the speaker grill with your mouth and try to suck out whatever that's trapped inside. If it doesn't work give your phone to the Apple Store. It must have been a manufacturing default.

All the best!

Take it back to where you got it from & have them check it out for a repair/replacement.