My headphone audio output on imac makes a very loud low freg buzzing sound.

I have my Imac hooked up to my home studio for recording music. It is currently hooked up to my high quality rane mixer, which has superior sound quality. But for some reason every time I plug a cord into the headphone jack to my mixer, TV or anything else from the Imac headphone jack, it comes out with a very loud low frequency humming/buzzing noise even on very low volume settings, even with the bass turned all the way down. It is extremely annoying. Does anyone else have this problem? I would expect a little more from apple products. Especially with something simple like this, since these machines are mostly designed for video/audio production. . I have tried switching my cords around and changing my setup for months now. No luck. And, no, my imac does not have an optical out and I think that would probably solve the whole problem. Any ideas would be greatly appreciated. Thank you for reading.

Welcome to the Apple Discussions!
Do you have your recording equipment isolated from the computer equipment? These buzzes and rumbles are usually easily solved by making sure that your audio equipment is plugged into a different electrical circuit than the iMac.
However, yes your iMac does indeed have digital audio. I do not know of an Intel model that does not have digital audio. The audio ports do both analog and digital audio. To use digital audio you need a Toslink cable with a miniplug adapter on the iMac end of the cable.
Such as this;
http://www.amazon.com/gp/product/B00016W6Y6/pfrd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B00016W67I&pf_rd_m=ATVPDKIKX0DER&pf_rdr=063C32X7YE311VH2T7WY
Dah•veed

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My headphone audio output on imac makes a very loud low freg buzzing sound.

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