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Which headphone amp is technically superior? Help

I don't have the electronics accumen to figure out which of these two amps has better specifications. My headphones are Sennheiser HD600s.

The reason is that there are two amps at the same price with two different specs and I am trying to figure out which amp is objectively superior. I understand there are other factors such as component quality at work that determine which sounds better, but right now I need someone to explain the difference in the technical specs. Thanks!

AMP ONE

Power output 150mW/600ohms
Headphone connection>32 ohms
Output impedance 20ohms
Signal to noise 94dB ref. full output
Frequency response 20Hz - 20kHz/0,2dB (10Hz - 120kHz/-1dB)
THD 0,005%
Headphone jack 3-pole ¼" (6,3mm Ø ) phono socket
Power supply type Mains-fed outboard power supply
Output voltage 16V/500mA AC
Power consumption 16V/120mA AC
Dimension W x H x D 130 x 79 x 133mm
Weight 1.000g without power supply

AMP TWO

Power output 700mW/30ohms, 110mW/300ohms
Headphone connection > 30 ohms
Signal to noise 110dB (115dB - A weighted) at full output
Frequency response 20Hz – 20kHz/-0,03dB
THD (IMD) 0,003%/30ohms, 0,007%/300ohms
Gain 12dB
Headphone jacks 3-pole ¼" (6,3mm Ø) phono socket
Power supply type Mains-fed outboard power supply
Output voltage 16V/1.000mA AC
Power consumption 16V/230mA AC
Dimension W x H x D 103 x 72 x 151mm
Weight 1.080g without power supply
blackstonejd

Showing 2 responses by blackstonejd

blackstonejd OP
153 posts
 
Well, I finally got my hands on amp 2, which is the Pro-Ject Headbox SEII with the revised circuit board, and it sounds completely different from the original model. A lot more bass, punchier, quiter, and more pleasant. Also it is a capable of producing more clean volume on my HD600s.

Also build quality seems much better.

So amp two turned out to be a much better amp.
blackstonejd OP
153 posts
 
Ok, well these two amps that I have posted are revisions of the same model! Amp one is the Pro-Ject Headbox SE and Amp two is the Project Headbox SE 2.

Both currently seem to be part of the project headbox line. The Headbox SE has more features in that it has multiple inputs and a switch to change inputs. The headbox ii has a redesigned chasis.

I just got a brand new pair of HD600s and I have the headbox se here. But the headbox se 2 is the same price and I am trying to figure out what the purpose of having an se 2 is.
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