The IOS Reference is the statement Moving Coil Phono Preamp from Rega Research
This unit is two years old and is in perfect condition cosmetically and operationally. Front panel controls allow real time adjustment of DC input impedance, resistive loading, high filter, mute and mono.
The Ios Ref has a couple unusual features. Firstly, the defeatable high frequency filter is offers a very subtle attenuation of high frequencies to tame unusually bright cartridges or recordings. Secondly, for those who wish to reterminate their arm cables, the IOS Ref offers balanced inputs as well as high end WBT RCA input jacks. A phono cartridge is an inherently balanced design (R/L +/- and chassis ground) so this is a very interesting low-noise option.
Outputs are RCA only.
The IOS Ref is dead quiet and renders a huge open soundstage with incredibly low noise and fantastic resolution of detail. I've used it with cartridges from Rega, Lyra, Koetsu, and Fidelity Research, all with great success. It's easy to dial in while you're listening (no DIP switches!) and all the controls operate absolutely silently.
This Ios comes complete with box, Rega ref power cord, and all documentation. Weighs about 60lb!
Dedicated moving coil phono stage
Adjustable gain & load control
Gold plated input sockets
Four stage all symmetrical amplifier
Symmetrical discrete tracking power supply
Balanced XLR input
Reference range casework
Ultra-low capacitance cabling
Mute function / Mono function
Reduced noise floor
Dimensions W 434mm x D 350mm x H 97mm