Some of the audio out of my mac sounds as if there's a reverb effect on top

Mostly on videos, using VLC and quicktime it sounds as though there's a reverb/delay effect on top of the audio.. it's really annoying... haven't noticed it in any DAW's such as Ableton Live/Reason or Logic just in things like itunes,safari,vlc,quicktime.. it's quite strange

the problem persists no matter what i'm using. I've used my monitor pair(m-audio bx5a's), the inbuilt speakers and a pair of headphones...
I believe it has something to do with the inbuilt soundcard as when i attach an external soundcard to the bx5a's there is no reverb..
I just did a test two seconds ago.
Basically, i opened up ableton live (standard DAW) and put a kick drum beat on loop.
The output config was simply 'built in output'.
I first listened back on the monitors via the headphone out... bass drum has reverb on it.. out of nowhere?!
repeated the process with my headphones via the headphone-out .. same tail of reverb.. again out of nowhere.
I then repeated the process with just the inbuilt speakers.. again lots of tail..
Having done all this i attached my numark omni control midi controller which has an inbuilt sound card plugged the monitors into the output of the controller.. bass drum comes out clean as a whistle...
ugh.. hope there isn't some sort of sound card related dilemma..
being a music technology student facing this problem is both embarrassing and frustrating!!! not many people would notice it in the first place!!!
So far i've considered two possible reasons for my dilemma-
1. There's something wrong with my internal sound card
2. I've installed some piece of software or changed some setting within some random piece of software that's effected all of the audio out of the inbuilt card...
man alive, it's annoying whatever it is.

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Some of the audio out of my mac sounds as if there's a reverb effect on top

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