Has anyone seen/used the "DUAL MONO 18v portable headphone amplifier" from Neco Soundlab (see here)? I've seen positive reviews of his regular 9V portable amp and of his MOSFET desktop amp, but I haven't seen anything on this one.
I note that he can customize the high and low gain settings (default settings are 4 and 8.5, respectively). I currently have the following cans:
- Sony XBR-MB700 (24 Ohms impedance, 106dB sensitivity)
- Shure SRH840 (44 Ohms impedance, 102dB sensitivity)
- Denon AH-D2000 (25 Ohms impedance, 106dB sensitivity)
When using the headphone jack on my Beresford Caiman, I find that the volume pot is mostly hanging out around 8 or 9 o'clock and I would prefer to have more playroom on my amp. Any thoughts on what a suitable low-gain setting would be for my current cans? Would 2 be excessive? I believe I remember reading a review of Neco's portable 9V amp where the reviewer stated that even 3 was a bit high for some of his headphones.
My next set of cans will almost certainly be a pair of Sennheiser HD650s, so I assume it is fine to leave the high-gain mode at the default 8.5 setting, but any input would be welcomed.