Not all but significant unlucky ones did have faults. I see these sometimes popping up on Ebay with the same faults been sold. Maybe Sennheiser pulled them do to amount of faults.

I think these were discontinued due too many been faulty after a few months. Like mine I always see these been sold as faulty on Ebay with one side not working. I purchased one for £50 with the side that I needed.

My IE300 right side finally failed on me after months of loose connection. The connection does not connect correctly and goes off just slight movement. I ordered a new cable as thought it might be the cable but the connection was worse and the connection was loose. The Left side works fine and...

The Poco F2 Pro has a very good DAC(Snapdragon 865), it's good enough to drive the IE300. Even when I increase Output Gain on Viper4android has no distortion or bass rolloff. Example I used the Poco X3 NFC and its DAC is weak in Comparison. The lows aren't as powerful and has bass rolloff...

My initial view of the IE300 were premature. I listen to Music mainly on my Phone (Poco F2 Pro) and use AOSP Roms. I recently changed Roms and the Sound Quality coming out of the IE300 is so much better. The highs are there and the mid bass is not as prominent. I am really liking these now...

I can't believe Sennheiser released such defective product. Read so many people complain about this issue. That's not even the only problem, the connection is not very strong can easily be pulled apart without much force. Their 2 pin connection was not perfect and had a lot of problems such...

The MMCX connection on the IE300 is really bad. Mine keeps going off and have to push it back in. Anyone know if it's the cable or the iem"s themselves?

I just got IE300 yesterday. After a day of listening not digging them as I would like to. I find the mids near the bass to be way too prominent. I have Viper4android EQ on my phone and have to reduce the 125 to 500 range and boost the Trebles . I prefer Subass around the 20 to 40 range and...

I am thinking of getting the Ie300, does anyone know how they compare with the Ie80s? Is it a worthy upgrade? Is the soundstage large like Ie80s? Thanks for anyone's help.

I think it sounds OK for pop, dance and hip hop music. But for Rock and Metal not so much. I guess Sennheiser focused more on popular music genres for the Mtw3. I also tried the Cambridge Audio Melomania and think they sounded better than the Mtw3. For me they had very bad fit for my ears.

I recently got the Mtw3 and not really digging them. I find the mid-treble to treble highs to be recessed. It seems to be overly bassy with high mid bass. The vocals sound as if something is covering the speakers. Played around with the EQ, boosting trebles gives a synthetic treble sound...

If you own an Android phone and root. Can install Viper4android via Magisk and you use increase volume output via Bluetooth. This always works with my Bluetooth speakers when volume is too low.

Thanks all for the tips and Suggestions. I think I am going to keep them. I have played around with the EQ and got the best sound, I love the bold sound of these, the bass is powerful but not overpowering. And the sound is still great with high volume. But un-equalized the sound is for me...

I have just got a pair of Eph-100 this is week after my IE80 broke.  I really like the Eph-100 as it gives me the best fit and isolation I have had with IEM, I found other IEM's like IE80,GR07 where I had problems with fit and seal.    The only problem I have with these is the Treble Highs, I...

Which is why I had installed a custom Rom with a better Kernel like Boeffla Kernal.  It is similar to what Voodoo Sound did to the SG1.  It boosts the volume higher then the Stock rom.     The SG1 Voodood still louder tho, it had some power.