bes51659

So you are on the right track! good news!

Balanced means differential input/output.
Unbalanced means that the (-) signal lead is ground/shield.

Balanced is better in a car. You cannot get ground loops. (unless you connect shield in both ends... Big no-no. You have to have cables with two signal leads per channel and one shield connected in one end only). Also any voltage introduced in chassis (generators etc.) does not affect the signal as it affects both + and - to the same amount. Its called common mode rejection. You can still get noise if you use poor cables. So its better with better cables.

Problem is when you mix balanced and unbalanced.

If you have balanced input/output theory means no reference to ground and its like the birds on the 16kV high voltage train line. You can connect -right and -left and ground and in effect get an unbalanced input _or_ output. No current. Bird does not burn. And this is what your link suggests that you do, 35!

In real life its very often a limitations to this.

If your problem 35, was that Bose does not handle a grounded (-)input very well I suggested a way round it (or rather to find out if that is the problem). To decouple the DC with a cap on the (-) lead. Last note was just an attempt to be clear that this ought to be done separately on each channel.

Now, since the turbo seemed to be the problem I do not think the problem was ever a balance/unbalance issue. Since you did not get noise but poor quality I should say that your turbo is not up to your standard. Get a better preamp.

Did this make it clearer or not? :-)