New guy here! Annoying resonating noise from supercharger...

Hey guys! Been reading this forum for awhile but Ive decided to post finally because of an annoying situation going on with the SC in my stang. The SC was installed on Memorial Day and was fine for about 2 months. The nice whistle of the charger was evident and all was good. This was until the summer heat and humidity set in and all of a sudden when my RPMs reached a grand and a half, the whistle begins to resonate ANNOYINGLY like an out of tune guitar string...It normally goes back to the generic whistle above 2 grand but if you ease the throttle and keep it at a grand and a half, the annoying resonating echo like whistle continues and doesnt go away. I does not occur until its AT a 1500 RPMS. I was thinking maybe it was the heat sensor in the air intake (since it seems to happen mostly in warmer weather) but its been happening sporatically in the cooler weather now too. Can anyone help me out? Thanks!

Powerdyne BD-11A blower 9 psi, the kit did not come with a separate boost gauge for inside the car. the belt tension seems fine...it has enough slack as well as tightness. i know the powerdynes have been known for belt slippage which causes pulley squeeks, but this happened after tightening the pulley/belt on the charger. the noise seems to be coming from near the cold air induction

my bro and i installed it...he is a certified mechanic so i trust in him that its working properly...the SC is self contained, no oil needed. the car runs like a helldog...great performance from the SC, no obvious running problems, just the damn resonating noise is irritating the hell out of me. lol. from the sound of it, its not coming from the SC itself, but from the cold air intake leading to the SC...i was thinking maybe it was a heat sensor. my bro told me he got the same noise at a certain rpm level in his cougar and it ended up being the sensor. i was just wanting to see if anyone else had come across this problem as well.