Looking at the 712 and 612. I am a musician who also does production. Why would I want to spend the extra money for the 712s? Thanks.

I own the 712's and 702's, but not the 612's so I can't fully comment on your question. However, I can say that the 712's are much better than the 702's. The 712's have a richer bass tone, which more than makes up for the lack of bass in the 702's. With the 702's I was producing mixes that actually had too much bass to compensate. The 712's are extremely clear, clean sounding, yet extremely flat too (except maybe a tiny boost in the bass, but it is not a boomy sound - still very clean). You can listen to them for a long time without getting fatigue. Also, they are more comfortable than the 702's. Another headphone that I really love is the Audio Technica ATH-M50's. They are definitely more fun to listen to than the 712's, and way better than Dr. Dre Pro's, but the highs and lows seem to be a bit more exaggerated (which is why they sound so good). They are closed back too, which makes them not quite as good for mixing as the 712's. But, they are in the $100-$150 price range. I hope this helps...

I just got this. The small disc on the outside of the left earpiece is falling out. I can press it into place but falls out again. How to fix it?

What disc? The disc behind the earpad that is a part of the earpad? Or the gray disc that is a part of the outer headphone itself? If it's the outer part I have no idea. If you're talking about the clear disc you will need to attach it with some kind of apoxy to the earpad.

Headphones Jack	3.5 mm Jack
Model Name	Reference Studio
Connectivity Technology	Wired
Wireless Communication Technology	Bluetooth
Included Components	Cable, Ear Pads
Age Range (Description)	Adult
Material	Leather
Cable Feature	Detachable
Item Weight	235 g
Customer Package Type	Normal Package
Item model number	2458X00140
Is Discontinued By Manufacturer	No
Color Name	orange
Connector	Cable
Material Type	Leather
Speaker Diameter	4.44 inches
Wattage	200 Milliwatts

AKG Reference Studio Headphones K712PRO 【国内正規品】

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