BFE Summing Box

[jensenmann]

Hi group
Here´s a few pictures of a summing box I made for a friend. It´s based on a BFE Summing amplifier card with a few additional features. Inputs are 2x DSub25 with 8 stereo inputs, 1x DSub25 with 8 mono inputs and 2 stereopairs of XLRs. The card is transformerbalanced on in and outs. There are VU meters added via JLM audio VU-buffers. Meter sensitivity is switchable to be able checking levels close to 0dBFs. I made the gain trimmable by removing the original trimmers on the card and replacing it with new trimmers and pots. Trim range is app. 10dB with 0dB being at the centerident of the pots.
enjoy
Jens

http://www.directupload.net/file/d/4359/wec958f4_jpg.htm

http://www.directupload.net/file/d/4359/q42p3o9b_jpg.htm

http://www.directupload.net/file/d/4359/clbmxguu_jpg.htm

 

[Holger]

Nice one, Jens. Would you mind measuring the L/R separation (cross talk)?
THX

 

[jensenmann]

I bet you know why you´re asking for crosstalk ;-)
It´s not as good as the datasheet promises with 110dB. In my configuration it´s reduced to 64dB, measured from a single input to the opposite output.

 

[radiance]

Neat!