I think Charles has given the most correct response to your inquiry. Chew it well.. I did and it sharpened my teeth nicely.
This just proves, you don't have to be an electrical engineer to manage pro audio.. but it doesn't hurt.
If the DM1000 has non floating balanced outputs, then wiring the XLR outputs to the LP-1 will simply require connecting XLR pin 2 to the 1/4" connector "tip" and XLR pin 1 to the 1/4" "sleeve".
This unbalancing will reduce the signal level by 6dB simply by virtue of the fact that you're not using the opposing polarity signal on pin 3 of the XLR.
If the LP-1 cannot accept a line level signal, then it's a simple matter to build an attenuator into the unbalancing adaptor
cable I described above.
If you connect a 10k‡ resistor to the output XLR (f) pin 2 connector and wire the other side of that resistor to (1) the "tip" of the 1/4" plug AND (2) to a 1k‡ resistor whose other end is connected to XLR (f) pin 1 you will have 20dB less signal at the 1/4" plug.
When returning the LP-1 to the DM simply make a cable that connects the "tip" of the 1/4" plug to pin 2 of the XLR (m) plug and tie pins 1&3 of the XLR (m) plug to the 1/4" "sleeve". Grounding pin 3 will give you as much as 6dB more gain, depending on the design of the input at the DM1000.
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Or, if you are soldergun challenged, you can hit your local pro-audio store for prebuilt adaptors/cables....
daniel