Koss P9 In-Ear Headphones with Volume Control

[image] Audiophiles are no strangers to Koss. After all, the Wisconsin-based company has been at the forefront of audio innovation since developing the world’s first stereo headphone in 1958. Over the years, we’ve sold many of Koss’s flags...

[image]

Let's just get straight to the point. We all want a drop for koss kph 40. Please upvote this post if you agree. [image]

[image]

After endless capacitor changes (SonicCaps) and op-amp rolling (OPA627AU on Brown Dog Adapters), and adding a beefier 9VDC switching power supply, I’d scored a nice STAX 100VAC with North America 120/110VAC Step Down Transformer off of eBay f...

Given the number of Koss headphones purchased here, a Drop for an upgrade to the energizer would probably have quite a few takers

[image]