Find helpful customer reviews and review ratings for Blue Spark Blackout SL XLR Condenser Mic for Pro Recording and Streaming (137) at Amazon.com. You can check all the other critical technical specifications of this microphone in the below table. December 28, 2017 . Spark SL is the studio condenser microphone, and that is why you will need the external power requirement of about 48 ohms. The Blackout Spark SL can be plugged into an audio mixer using an XLR cable, but since I don’t have one of those, Blue sent along its Blue … Blue Blackout Spark SL Mic Review by Adam Cook on . You can use the phantom power supply to use this microphone. Blue Spark SL Technical Specifications. A substantial upgrade from the Blue Yeti, the Blue Blackout Spark SL provides the luxury of using is a content creators dream microphone. For a while now, I’ve been wanting to switch to an XLR mic setup for GodisaGeek audio and video productions. Read honest and unbiased product reviews …