Does USB cable length make a diference?

The Tivoli... funny. I bought one of those for the kitchen... I gave it away.

Yes, separates of the same quality outperform an integrated. Putting all those circuits so close together generally degrades the performance.

In general, interconnects and speaker cables... shorter is better. But they must be long enough to do the job. High quality ones don't degrade the sound as much as budget ones. 

Power cords are different. Longer the better. 2 meter being the preferred length. I was able to test a one and two meter of the exact same model on my power amp... it was very obvious. As my dealer says, "Twice the length, twice the power conditioning."

I like the option of changing out a DAC. Streamer/Dacs are fine........I just prefer to have options

I keep hearing, including from the historically (IMO) Paul McGowen, that cable length (within reason) makes no difference. I'm not so sure. I DO believe there is physical science behind wire sound, just it's either too complex to predict or beyond our ability to measure, either too small or some factor we don't measure or don't know about. Even if it's only a matter of tiny changes in resistance, capacitance and inductance, all those factors are dependent on wire length. A 2 meter cable will have roughly 2x the resistance of a 1 meter cable. Engineers will say agree that there's a difference but might say that it's too little to effect the sound and can be ignored. Well, how do they know what can be ignored if they don't know what's causing the sound changes? The usual answer is that we're all victims of self-delusion, poor experimental design or observer bias. That neatly avoids the elephant and is an ENTIRELY unacceptable response!

Power cords are different. Longer the better. 2 meter being the preferred length. I was able to test a one and two meter of the exact same model on my power amp... it was very obvious. As my dealer says, "Twice the length, twice the power conditioning.

You must be joking!! 

No.