I would say that the K701 has a larger soundstage than the SA5000 spatial wise. However the Sony's have here more focused details than the 701. Where some don't think the 701 has enough bass impact, the Sony's have plenty of bass impact quality and quantity when the music calls for it. Bass quantity is less than the D7000, but not too much, but more than the 701.
I don't do many reviews on this site (use to do some) because Head-fi is not what it use to be anymore. Plus my time is not what it use to be. So others who love to post a lot can chime in.
M-Audio 5.1 (about the same as their Audiophile 192 or the ESI Juli@), into an Aphex HeadPod 454, with a 1000 mA supply that can run any headphone from 8-1000 Ohms. (I am more of a speaker/studio guy in spare time). It has a single input or can be used balanced input, with 4 individual headphone outs. Or I use my vintage JVC/Victor (1978) JA-S77 TriDC Integrated Amplifier.
Bench test from Pro Audio Review:
Bench Test
Bench Measurement Data
(Unless otherwise specified, all tests reflect signals applied to the balanced input and taken from output #1, with outputs 1 and 3 loaded on both channels, measurement bandwidth of 22 Hz to 30 kHz, or <10 Hz->500 kHz, and worst-case results.)
Input Impedance (1 kHz)
Bal: 21kø; unbal: 10 kø
Output Impedance
10ø approx.
Output Polarity
Non-inverting
Max. Input (1 kHz) into
8ø (28 dBu), 150ø (28 dBu), 600ø (28 dBu)
Max. Output (1 kHz) into
8ø (750mW), 150ø (540 mW), 600ø (152 mW)
Frequency Response
Fig. 1: Frequency response at 10 mW into 600 ohms
20 Hz-20 kHz +0.1, -0.2 dB;
10 Hz-100 kHz +0, -0.6 dB
THD+noise (20 Hz–20 kHz)
<0.03% at 1mW into 8ø, or 10 mW into 600ø
S/N (A-wtd.)
92.8 dB re: 10 mW into 8ø
90.3 dB re: 1 mW into 600ø
Crosstalk
>71 dB, 10 Hz to 20 kHz
Happy listening!