Definitely good components you are using! And running the HD560S balanced is definitely a good idea. Also the S9 Pro has enough driving power for them.
Just hope it will match together and not be too bright. I know that the HD560s are ideally driven on a slightly darker, possibly even smoother, source. Several people report good results for tube amps.
The Hidizs sound is usually pretty good, and it’s usually very neutral. I don’t know the S9 Pro, though. Would have to read reviews on sound quality. Hopefully it leans towards the warmer side.
On hint straightaway: give the HD560s some hours of burn-in. In my case treble was pretty harsh at first.
coming from the ATH-R70X and HD600, I'm pretty happy with the treble of the hd560s. The only hp that's unbearable for me in that regard is the dt1990. The s9 pro is the most accurate dongle in the market. even if it'll be not so warm, I will be pretty happy. These headphones are a dream come true. A cheap, tonally correct model with good technicalities, almost an impossible mission. after 136 models owned, these are the sweet spot.
1-Shure E2C 3/5
2-Sony MDREP50 2/5
3-Sony MDREX700 2,5/5
4-Sennheiser CX300 II 2/5
5-Sennheiser HD380 PRO 3,5/5
6-Sennheiser IE7 4,5/5
7-Sennheiser IE8 3,5/5
8-Yamaha EPH100 4/5
9-Shure SE215 3/5
10-Rha MA450i 2,5/5
11-Rha MA750i 4/5
12-Creative Cal! 4/5
13-Akg K271 mkII 3/5
14-Audio Technica ATHM50s 3,5/5
15-Akg K167 Tiesto 4/5
16-Rha CA200 2/5
17-Meliconi HP100 1,5/5
18-Beats Pro 2/5
19-Akg K550 4/5
20-Sony MDR1R 3,5/5
21-Pioneer SEA1000 3/5
22-Ultimate Ears UE6000 3,5/5
23-Shure Srh940 4,5/5
24-Sennheiser HD25 alu 4/5
25-AKG K81dj 3/5
26-AKG K518dj 3,5/5
27-AKG K545 4/5
28-Sennheiser CX3.00 2,5/5
29-Sony MDR-EX650ap 2/5
30-TDK ST-750 2,5/5
31-Shure SE425 4/5
32-Sony MDR-100AAP h.ear on 4/5
33-Sony XBA-C10 2,5/5
34-Hifiman RE400 4/5
35-Skullcandy Crusher 3/5
36-Sennheiser Momentum 2.0 oe 2/5
37-Philips Fidelio M1 mkII 4/5
38-VE Monk plus 3/5
39-Sennheiser HD598SE 4/5
40-Audio Technica ATH-CKS550i 3/5
41-Akg Y50 3/5
42-Marshall Mid Bluetooth 3/5
43-Philips Fidelio S2 4/5
44-Brainwavz B100 4,5/5
45-Marshall Mode 3,5/5
46-Audio Technica ATH-E40 3,5/5
47-AKG K712 Pro 4,5/5
48-Koss KSC75 4/5
49-Sony MDR-EX110 3/5
50-Akg K518 LE 3,5/5
51-Sony MDR-EX110ap 2,5/5
52-Marshall Mode EQ 3,5/5
53-Beyerdynamic DTX350M 3/5
54-Marshall Monitor Bluetooth 3/5
55-Akg K845BT 4/5
56-Yamaha HPH-PRO500 3,5/5
57-Koss KPH30i 4/5
58-Yamaha HPH-MT8 4/5
59-Koss PortaPro 3,5/5
60-Koss PortaPro X 3,5/5
61-JVC HA-S160 Flats 3/5
62-Philips SHL3505 Fixie 2,5/5
63-Fiio FH1 2,5/5
64-Brainwavz B200 2/5
65-MeeAudio Pinnacle P1 4/5
66-Sony MDR-1AM2 Black 4/5
67-Sennheiser HD58X Jubilee 3/5
68-Koss KSC75 X 4/5
69-Beyerdynamic DT880 Pro 250 Ohm 4/5
70-VE Monk plus mic 3,5/5
71-Audio Technica ATH-M40X 3/5
72-Audio Technica ATH-M40X DEKONI sheep 3,5/5
73-Sennheiser Momentum 2.0i AE 3,5/5
74-Fiio FA1 4/5
75-AKG K612 PRO 4/5
76-Philips SHL3565 3/5
77-Pioneer HRM6 3/5
78-Audio Technica ATH-M50X blue 3/5
79-Beyerdynamic DT770PRO 32 Ohm 4/5
80-Marshall Major III 3,5/5
81-Sennheiser HD300 3,5/5
82-Panasonic RP-HTX80b 1/5
83-Sennheiser HD4.40 BT 3,5/5
84-Sennheiser HD599SE 4/5
85-Pioneer SE-MS7BT 2/5
86-Alessandro MS1 3,5/5
87-Sony WH-H900n h.ear on 2 2,5/5
88-Sony MDR-7506 3/5
89-Beyerdynamic DT770PRO 80 Ohm 4/5
90-Marshall Minor II BT 4/5
91-AKG K371 4,5/5
92-AKG K245 3,5/5
93-AKG K240MKII 4/5
94-Beyerdynamic DT990PRO 250 Ohm 2,5/5
95-Beyerdynamic DT880PRO 250 Ohm 4,5/5
96-Sennheiser HD2.10/HD100 4/5
97-Sony MDR-1AM2 Silver 4/5
98-Brainwavz Koel 4/5
99-Apple AirPods Pro 4,5/5
100-Creative Aurvana SE 4,5/5
101-Tin HiFi T4 4,5/5
102-Beyerdynamic DT770 PRO 32 Ohm 4/5
103-Philips SHP9500 4/5
104-Koss KSC75 Yaxi Pads and Porta Pro's headband 4,5/5
105-Koss Porta Pro 4/5
106-AKG K712 PRO Slovakia 2020 (Defective)
107-Sennheiser HD6XX balanced 4/5
108-AKG K361 3,5/5
109-AKG K371 4,5/5
110-Apple Earpods 3/5
111-Sennheiser HD380 PRO 3/5
112-Sennheiser HD25 Basic Edition ‘20 3/5
113-Sennheiser HD600 2019 4,5/5
114-Sennheiser HD25 <2019 3,5/5
115-AKG K275 3,5/5
116-Beats Solo Pro 3,5/5
117-Moondrop Starfield 4,5/5
118-Sony MH-755 4/5
119-Sennheiser HD206 2/5
120-Philips Fidelio X2HR 3,5/5
121-Beyerdynamic dt770 80 Ohm rodata 4,5/5
122-Moondrop Aria 2 4,5/5
123-Sony MDR-7510 4/5
124-Sennheiser HD560S 4/5 (dective
125-Beyerdynamic DT880 Edition 250 Ohm 4/5
126-Beyerdynamic DT1990 PRO 4,5/5
127-Audio Technica ATH-M50X Sheep Pad 3,5/5
128-Sennheiser HD25 Copper Cable 4/5
129-Sennheiser IE40 PRO 2,5/5
130-AKG K702 4/5
131-AKG K702 memory 4,5/5
132-Hifiman Sundara 4,5/5 (defective)
133-AKG K371 revision 4,5/5
134-Audio Technica ATH-R70X 4,5/5
135-Moondrop Blessing 2 5/5
136-Sennheiser HD560S 5/5
I'm done. I don't like the more expensive sub 1000 euro costing models I tried at the shops around the world, and I can't spend more than 500. so for me it is an happy ending
I had some very powerful amplifier, but the difference with the s9 pro or even a fiio btr5 in balanced mode is too little with headphone so easy to drive.