Drop x Sennheiser HD58X Headphone Review - What's Wrong and How to Fix It

A review of the entry-level, audiophile HD58X headphones.
You can buy the HD58X here: massdrop.7eer....
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DROP X SENNHEISER HD58X SPECIFICATIONS
- Glossy black headband, gray metal grilles
- Ear coupling: Over-ear (circumaural)
- Transducer principle: Open, dynamic
- Impedance: 150 ohms
- Frequency response: 12-38,500 Hz (-10 dB)
- THD + N: less than 0.1% at 1 kHz, 100 dB
- Sound pressure level: 104 dB at 1V, 1 kHz
- Connector: ⅛ in (3.5 mm) gold-plated stereo jack plug
- Cable: 6 ft (1.8 m) OFC, detachable
- Weight without cable: Approx. 9.2 oz (260 g)
- Individually serialized
- Made in Romania
PASSION FOR SOUND GEAR LIST
(Affiliate links to Amazon and Apos Audio help to support the channel - thank you!)
Desktop Sources
Playback software: Roon roonlabs.com/r...
Primary DAC: Chord Hugo TT2 tinyurl.com/y4... with Chord M-Scaler tinyurl.com/y6...
Secondary DAC for active speakers: Topping D50s amzn.to/2T2GExr upgraded with Muses02 op-amp amzn.to/2FtPmNj
USB cables: AudioQuest Diamond amzn.to/35AX4Qf and AudioQuest Coffee amzn.to/3059qiA
Active Speakers
Bang & Olufsen BeoLab 3 Speakers
Amps
Massdrop x THX AAA 789 Amplifier massdrop.7eer....
Bottlehead Mainline DIY kit tube amplifier bottlehead.com...
Burson Audio FUN: www.bursonaudi... with Sparkos Labs SS3601 op-amps: sparkoslabs.co...
Headphones
Open: Meze Audio Empyrean tinyurl.com/y6...
Open: Focal Clear amzn.to/37Ihgky
Semi-open: Beyerdynamic DT880 Premium LE massdrop.7eer.net/L6633 or amzn.to/3bBg7xs
Closed: AudioQuest NightOwl Carbon (these may have been discontinued)
Closed: Audio Technica ATH-M50x amzn.to/2Y2NeXo
Closed: Meze Audio 99 Neo tinyurl.com/y2...
Portable
Phone: Samsung Galaxy S10+ amzn.to/37MzTUA
DAC for phone: Audioquest Dragonfly Cobalt amzn.to/36AzpAB
Digital audio player: Astell & Kern AK240 Stainless Steel amzn.to/2ZluP70
Earphones
Audiofly AF1120 Mk2: amzn.to/2ZoTuHZ
Noble Kaiser 10 custom IEM (discontinued) - universal version available via Drop massdrop.7eer....
SIMGOT EN700 PRO amzn.to/304xO3R
Shozy Form 1.4 amzn.to/3cIL0Az or massdrop.7eer.net/499YL
Bluetooth Headphones
Nuraphone amzn.to/2N7G2Tu