Oxmoor 4x4 Buffer Amplifier. 4 Chan Summing / Matrix / Splitter

Oxmoor 4x4 Buffer Amplifier - tested & working. This is a 4 input to 4 output ‘summing / matrix unit with gain / attenuation’ - each input is balanced, each output is transformer balanced. Each input can be routed to any (or multiple) of the four gain stages, then in turn each of the four gain stages can be routed to any (or multiple) of the four output sections. The routing is achieved by removing the top lid and changing the position of the jumpers (this is described in the manual which can be found online).

This unit has many uses, such as summing two line level stereo signals to one stereo out or splitting a stereo signal to two stereo outputs or producing a mono summed output from a stereo signal etc etc. Also usefull for converting unbalanced to balanced or visa a versa. It could alternatively be used to add some transformer ‘colour’ to four channels…..

Its very nicely made & uses some high spec components such as the Analogue Devices op-amps, transformers with ’exotic metal’ laminations etc - it’s not the quietest unit I’ve ever come across but it’s tested & working. It is currently set up as four separate channels of in / out with the gains set at roughly unity.

Please note, this is the more expensive version of this unit as it has (as mentioned above & as can be seen from the photos) output transformers for each of the four outputs.

It does have some cosmetic imperfections, which I have tried to show clearly in the photos (mostly scratches / marks on the top & bottom panels / front panel etc) but nothing too major. Please see all the photos.

Any questions please ask.