Listened on FiiO m11 Pro, Monoprice THX – optical from PC

I found that these were detailed, really good treble, good mids, great bass and good sub bass. The mid’s were excellent to my ear vocals were not out of place or forward. Treble was excellent, very detailed. I would say these have a reference sound to them with a slight elevation in bass. To my ear they were great, I really enjoyed listening to them. In fact i would say these are better than the Mangrid Tea. They have the same detail in the treble regions and smooth but clean mids. Their bass was better, tighter with no booming. I guess you could say that these were clearer than the Mangrid Tea, like someone took the Mangrid Tea and lifted the veil from it. Which I didn’t really know was there till I listened to these.

Link to IEM on Penon Audio: https://penonaudio.com/isn-audio-h40.html?search=isn%20h40


Tracy Chapman: Very clear and reference sounding with near perfect bass. Best I have heard that track sound yet. Stage was excellent.

Lady Gaga – Joanne: Guitar was great, clear, realistic and detailed. her voice was beautiful. Very melodic and not technical. Mids excellent and bass.

A-Ha  MTV Unplugged – Take On Me: 

Portishead – Mysterions:  Very clear and reference sounding with great bass, very tight and clean. Detail was very good.

Portishead – Sour Times: Sounded awesome,nothing more to say. 

Rodrigo Y GabrielaHanuman: 

Alexis ColeA Beautiful Friendship:

R.E.M. – Try Not To Breathe: Voice was crazy clear, background guitars sounded in the right position and the timbre was excellent.


Miles Davis – Someday my price will come: Detail was excellent, separation. Treble was excellent especially symbols and snare brushes.

Miles Davis – Teo: Drums and snare were crazy good. trumpet was spot on. The highs, mids and bass were fantastic. The stage was the best of all the songs, felt wider than some headphones I have tried.

Cecelia Strange – Bridge – Saxophone felt like I could feel the wind vibration of the instrument but with Mangrid tea still sounded very good but didn’t get that same experience

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