If you want the audio spectrum artificially boosted in some way, forget the DAC2. It is neutral - which some *#"~* people describe as boring. They are probably the people driving down the High Street with bass blasting out of their cars.
I used a Benchmark DAC1 for a few years. It was neutral and super-detailed without any artificial edges but somehow it did not sound realistic. It was, nevertheless, the best DAC I could find at the time and with the right amplifier could portray a full orchestra well enough to be able to listen to each instrument individually if that is what you wanted to do.
I changed to the DAC2 because: A. it added a tiny bit of warmth B. it was neutral and naturally detailed, C. it gives a fantastic 3D sound-image, D. it streams and plays 'all' hi-res and DSD without any problems and E. It completely removes the need for a separate pre-amp.
With a good recording, an orchestra playing on my speakers now seems to extent outside the sides and behind the speakers, well into my back garden. Magically, the image also has a bit of height. Its imaging creates a superb illusion of reality. If you play a simple recording of musicians that could actually fit in your listening room, it really can sound as if they are there. When Nigel Kennedy wanders around whilst playing his violin, you can 'see' him moving. Very few systems can manage that and it was not the case with the DAC 1 nor with a dozen other DACs of all prices that I tried. The DAC2 is still the best DAC I have heard. Many expensive DACs sound like jokes in comparison, desperately trying to impress by altering the sound. Many cheaper DACs do this deliberately or accidentally. That may of course be useful for balancing out a shortcoming in your system but it leaves you with a problem if you ever want to upgrade your system.
HEADPHONE AMP
My favourite headphones are my Beyerdynamic DT 990 PRO (250OHM), which some people criticise for being a bit harsh, I'm not sure why. I don't have many dedicated headphone amps to compare it with but the DAC2 makes them sound better than anything else I have. It gives an unforced, close-up presentation of the performance with great texture, timbre and subtlety with no hint of a 'U' shape, a 'V' shape or any other shape. Dying echos, when they exist, can almost be counted. I also get a great performance using my Shure SE535s - which are again the best earphones I have heard.
For head-phone amp comparison, the next best I own is an Oppo HA2. The Oppo is good enough that it even made me sell my A&K but the DAC2 is significantly better. It seems to grab the headphones and make them do what IT wants rather than what they want. So, if you don't want 'neutral', don't buy a DAC2, but if you really want to hear the recording, I have yet to hear anything better.
I have not yet heard a DAC3 but I am told they are very similar sounding but 'technically' better.
I used a Benchmark DAC1 for a few years. It was neutral and super-detailed without any artificial edges but somehow it did not sound realistic. It was, nevertheless, the best DAC I could find at the time and with the right amplifier could portray a full orchestra well enough to be able to listen to each instrument individually if that is what you wanted to do.
I changed to the DAC2 because: A. it added a tiny bit of warmth B. it was neutral and naturally detailed, C. it gives a fantastic 3D sound-image, D. it streams and plays 'all' hi-res and DSD without any problems and E. It completely removes the need for a separate pre-amp.
With a good recording, an orchestra playing on my speakers now seems to extent outside the sides and behind the speakers, well into my back garden. Magically, the image also has a bit of height. Its imaging creates a superb illusion of reality. If you play a simple recording of musicians that could actually fit in your listening room, it really can sound as if they are there. When Nigel Kennedy wanders around whilst playing his violin, you can 'see' him moving. Very few systems can manage that and it was not the case with the DAC 1 nor with a dozen other DACs of all prices that I tried. The DAC2 is still the best DAC I have heard. Many expensive DACs sound like jokes in comparison, desperately trying to impress by altering the sound. Many cheaper DACs do this deliberately or accidentally. That may of course be useful for balancing out a shortcoming in your system but it leaves you with a problem if you ever want to upgrade your system.
HEADPHONE AMP
My favourite headphones are my Beyerdynamic DT 990 PRO (250OHM), which some people criticise for being a bit harsh, I'm not sure why. I don't have many dedicated headphone amps to compare it with but the DAC2 makes them sound better than anything else I have. It gives an unforced, close-up presentation of the performance with great texture, timbre and subtlety with no hint of a 'U' shape, a 'V' shape or any other shape. Dying echos, when they exist, can almost be counted. I also get a great performance using my Shure SE535s - which are again the best earphones I have heard.
For head-phone amp comparison, the next best I own is an Oppo HA2. The Oppo is good enough that it even made me sell my A&K but the DAC2 is significantly better. It seems to grab the headphones and make them do what IT wants rather than what they want. So, if you don't want 'neutral', don't buy a DAC2, but if you really want to hear the recording, I have yet to hear anything better.
I have not yet heard a DAC3 but I am told they are very similar sounding but 'technically' better.