Passive headphone correction filter for Beyerdynamics DT770 Pro 80 headphones
The Beyerdynamics DT770 Pro 80 headphones sound very good. However, the lower frequencies are emphasized which sometimes results in 'rattling'.
Solderdude from 'DIY Audio Heaven' was so kind to send me the details of a passive filter to suppress the lower frequencies. This has to be placed between the headphone amplifier output and the headphones. See DIY Audio Heaven.
|soldered to the cable|
|showing the process of shoving the filter into the pipe|
|with a closeup|
|sealed with hot glue, but not air tight due to a ventilation hole|
|heat-shrink tubing applied, looks nicer|
|from left to right: PSU, filter, headphone amplifier|
How does it sound? Definitely more neutral, lineair. Bass is not exaggerated anymore as was the intention and voices are more pronounced than without. I will keep the filter inserted, I like it.