How can I connect my DAT to a Sound Board to record a concert ?

There are several different connection schemes you may encounter in a live recording situation. They are the standard RCA connectors (like those used in a home stereo), 1/4 inch connectors, either mono or stereo, and XLR type connectors. I advise you obtain cables to allow for any of these connection possibillities. A single set of RCA to whatever input your machine requires. To this add a 1/4 " to RCA female and XLR male to RCA female adapters. A "Y" adapter to ensure you can record a mono feed onto both channels of your DAT machine is adviseable. Another useful device is a stereo 1/4 inch to RCA adapter, this allows you to use a headphone output to get an audio signal. Be aware that many soundboards output very hot signals. If you are recordng at 4 or below on your non-professional (i.e. no XLR inputs) deck (this is true for the Tascam DAP-1 using the RCA inputs as well) then set the record level control on you machine to about 6 or 7. Then ask the sound person to turn down the send level from the board. When they get your levels close to right, you may fine tune the levels using your record level knob. If this is not possible, you may need to use an attenuating cable or adapter in line with the feed. The Sony SBM-1, D3/7/8's and Tascam DAP-1 (RCA in) will sound very distorted when recording with the level knob at 3 1/2 or below.