Cool pre-amp but could damage speakers

The speakers I purchased for my system are somewhat cool sounding in the mids so I bought this pre-amp to warm them up and give them a more full sound. Taking this little guy out of the box it felt very well built and sturdy considering how small it was. I LOVE the feel of turning the nobs, it gives you a very satisfying click click click as you adjust them. The sound quality out of this didn't significantly change the sound but it's possible I needed to let this thing burn in a little. The treble and bass adjustments worked well and provided a noticeable difference in sound from min to max. Sitting next to my class D amplifier with the cool blue lights on and the gold finish on the nobs looked very cool. Unfortunately when I plugged these in line between my source and my amp and powered it on it gave the speakers a large pulse which made sort of a BOOM sound. When I turned the preamp on and off I kept getting the boom sound which made me feel like it could be sending too large of a signal into my speakers, potentially damaging them. Since I spent good money for high quality speakers I didn't want to run the risk of damaging them with a cheap little pre-amp so I will not be using it anymore.

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