You loose about -15dB of signal with the 4.7k mod (-12dB with 3 wire-config).
With the preamp set to 50%-70% of its max. gain you make up the lost 15dB
Okay, so I'm not wrong in turning up the pre to ~75% then...with the +10 switch?
Virgin recording w/ this gear on Tuesday guys, it's gonna be a great show...help me to make it a great recording please
i don´t have the 9000 preamp but the 9100 which only has 1 gain-knob with a range from 0db to approx. +20dB(+23,5dB according to chris).
if your +10dB-switch means that 100% on the knob are +10dB, then it would be ok when using an iriver h140 rockboxed
with l+r gain set to +10dB on the rockbox screen.
I can´t speak for your gear though.