"It seems like there's a lot of cool DI boxes around these days, often sporting tubes and advanced features. Leave it to British Columbia-based Radial Engineering — makers of some wildly popular direct-injection and inter-connecting boxes — to add its Firefly to the trend..."

"What this all boils down to is another big hit for Radial Engineering in its series of tube-driven direct boxes – truly a piece of art for those wishing to capture the warm tone of a tube with a solid isolation from the source. I see it being a huge hit amongst the live and session bass players and hope to see many more of these."

"This two-channel DI box - with a nice warm valve for that unmistakable sound - is a serious piece of kit, aimed both at the recording and touring musician..."

"It's rare to find something that's this well sorted - practically and aesthetically - both on stage and in the studio."

"The Firefly is a top-notch DI that imparts sweet tube warmth to all that passes through it, and the feature set gives you many advantages onstage as well as in the studio."

"Simply put, the Firefly sounds unreal. In my review, I tried every instrument I had available: acoustic guitars, electric bass, acoustic bass, farfisa organ, analog synths, digital synths, mandolin, Fender Rhodes, and a Wurlitzer 200A. I could not find anything that the Firefly didn't make sound amazing!"

"The Firefly performed in a league of its own. The sound had strength, character and beautiful resonance... During the private show we recently did, the Firefly performed liked a champion. The bass sound it renders is warm and round, yet still big and punchy. The harmonic content is fantastic."