![AudioTechnology Mag on Twitter: "Review: Sennheiser HD400 Pro - https://t.co/efa0pYN5aU I'll kick off with a philosophical question. What's 'Pro' mean? I'd suggest that Forrest Gump had the answer: 'Pro is, as Pro AudioTechnology Mag on Twitter: "Review: Sennheiser HD400 Pro - https://t.co/efa0pYN5aU I'll kick off with a philosophical question. What's 'Pro' mean? I'd suggest that Forrest Gump had the answer: 'Pro is, as Pro](https://pbs.twimg.com/media/FLq7c8ZVkAE_AXj.jpg:large)
AudioTechnology Mag on Twitter: "Review: Sennheiser HD400 Pro - https://t.co/efa0pYN5aU I'll kick off with a philosophical question. What's 'Pro' mean? I'd suggest that Forrest Gump had the answer: 'Pro is, as Pro
![Sennheiser HD 400 PRO - - Professional studio reference headphones designed for everyday monitoring, mixing, and mastering Sennheiser HD 400 PRO - - Professional studio reference headphones designed for everyday monitoring, mixing, and mastering](https://assets.sennheiser.com/global-downloads/file/21948/HD_400_PRO_In_Use_Shot_P1160525_small_Sennheiser.png)
Sennheiser HD 400 PRO - - Professional studio reference headphones designed for everyday monitoring, mixing, and mastering
![Sennheiser HD 400 PRO - - Professional studio reference headphones designed for everyday monitoring, mixing, and mastering Sennheiser HD 400 PRO - - Professional studio reference headphones designed for everyday monitoring, mixing, and mastering](https://static.pxlecdn.com/photos/469838281/medium/2fec1e20520fe6f4e549.jpg)