some questions about the preamplifer of microphone array, using PXI-6123 DAQ

[tercel]

I want to develop a 32 channel microphone array. My lab has 4 PXI-6123 DAQ devices, and 32 channels to analog input. We have to use simple eletret microphone as sensor, and the sensitivity is very low. The output voltage cann't be inputed by the 6123 DAQ (the Guide of DAQ indicates the minimum scale is -+1.25v), I think it should have a voltage preamplifer before inputing by DAQ.
Can you suggest some advice how to connect my system, using the above mentioned devices ?
 Do NI have some devices with the function?
 Thank you!

[endeavor_pi]

NI在声音和振动测量领域有一系列硬件可以应用，通过http://sine.ni.com/nips/cds/view/p/lang/zhs/nid/12051可以选择合适的测量硬件。