I purchased sennheiser HD 428. They sound alright. What is the cheapest amp I can get for them that will improve sound the most?
428 HD Headphones Specifications:
* Frequency response: 18Hz-22kHz
* Impedance: 32 ohms
* Sound pressure level (SPL): 110 dB
* Ear coupling: Circumaural
* Transducer principle: Dynamic, closed
428 HD Headphones Specifications:
* Frequency response: 18Hz-22kHz
* Impedance: 32 ohms
* Sound pressure level (SPL): 110 dB
* Ear coupling: Circumaural
* Transducer principle: Dynamic, closed








