Originally Posted by Draconian616
I do like the sound from the Grados, I thought upgrading the headphones would require a better amp, especially for the headphones you mention, the RS2i are my budget alone £685 UK.
USB Dacs? I had no idea what a DAC (digital analogue converter) was until on went on What Hi Fi yesterday.
Remember I have not looked at upgrading my system for 15 years, and the problem with computers they crash/die and you loose all data, I would have to look into it.
I found the manual to the DSP-A590 amplifier, it states the headphone output impedance is 390-Ohms :(
For your 32-Ohm Grado SR60i headphones, it would be recommend to use a headphone amplifier with a output impedance of 4-Ohms or less.
The DSP-A590 should have been causing a very bloated (louder, less detail) bass, for the SR60i headphones.
Which maybe for someone who listens to metal, the bloated bass might have been to your liking.
The AKG K612 Pro (120-Ohm) headphones sell for 159 Euros (135 GBP), at Thomann (UK)
I'm assuming you use speakers with your audio setup?
So replacing the Yamaha amp with something newer should help with the impedance (Ohm) issue.
I would think you could maybe spend 200-300 GBP for a receiver (new or used).
Check the website AVforum, someone there should be able to point at good deals on receivers (new or used).
Then you could just use a S/PDIF (optical or coaxial) cable to connect your Marantz CD-67SE to the receiver.