Ground-Looping Problem

I have read a lot of forums on this, but for me, all the solutions given have not worked for me. I keep getting oud buzzing noise in my right speakers. Here is my scenario. I have a Macintosh Powerbook.

The audio out of the laptop goes into an M-Audio MobilePre (Audio Interface)

From there, White/Red RCA output cables WITH a ground-loop isolator connect to my Onkyo receiver.

From there the Onkyo receiver connects to 2-sets of speakers. Speaker set A and B.

Hi-fi Without All the Discs

I'm attempting to build my first stereo system with a little help from you guys. Up until now hi-fi has always meant hitting the road with my Sennheiser's, ipod and portable amp, but I want to be able to come home, take my ipod out of my bag drop it into a system that sounds as great as my 'phones.

I'm new to the hobby and want to spend about $1000 (pretty typical from reading this forum). I've read many of the posts on this forum and this is what I'm thinking at the moment:

Cd player situation

The cd player is not more a suited hifi reproducer today.

The quality it's give you related the price is very low.

The new format you have to use is an usb device theat means:
hard disk
memory
telephone connection

Using a Teac Wap5000 costing 250$ you can:

reproduce internet radio also at 320kb/s
record it on HD
reproduce with media player selection by its graphic terminal of what you have ob hd/memory usb or connected wireless by your pc.

The quality of mp3 using its internal DAC is at level of cd player costing 500 $.

A very, very small observation about my feet.

Some time ago, I posted here about my need for some good "bookshelf" speakers and, thought a bit of research, I determined the AudioEngine 5's would suite my needs.

I then posted that they lacked just a little in the bass area, and that I missed it.

But tonight, with my wife and child away for the weekend, I was able to crank these speakers up a bit as I would like, but which would normally wake a 3 year old and I found the bass.

My feet want to feel the bass.

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