HMS TPO MATCH cables

I too have left mine on zero. You might get some suggestions from the manufacturer if you give the output and input impedances of the items you're connecting. Excellent cables overall, give up very little to the much higher priced cables in my system.

Please let me, as importer of HMS, explain the impedance box settings in detail:
Not in every case you will need a different setting, although it is good to know that you are ready for the future. You will eventually change a component and suddenly you might need a different setting. With HMS you are always prepared for any system changes, the cables will grow along with your system.
The goal is to find the setting which lowers the music volume between 20% to 30% . Now use your volume control to raise the music volume to the level you like. This should be the perfect HMS TOP Match Box setting, since the sonic signal should now be far less distorted.

Tekunda thanks for a new insight, but why do so many feel zero setting is fine, almost like questioning additional investment in the boxes in an otherwise good cable.

I found no changes in the sound in my system. I also have them at zero. Has anybody played with the settings on the speaker cables and heard a difference. Its hard to do alone. Do you know how hard it is to change a setting and run back to the sweet spot before the next note of music comes out.You've got to be quick.

Sunilsood,
the people responding here do not represent a true mirror of my customers. Not every HMS customer will post at A’gon. I think at least 50 to 60 percent of all HMS GF TOP Match customers use a different setting. I hardly have one customer who will buy a pair of cables and you will not hear again from him. So from emails I really feel that at least half of my customers settle on one setting other than default.
I myself use in my system setting 1 on my cdp to preamp cables and setting four from the pre to my monoblocks.
My father in Germany, who also has a full HMS cables system, uses setting 1 on the cd to pre amp also and he is not done experimenting with the cables from the pre to his four KR monoblocks. It looks like he will keep these cables on setting 2.
And according to Mr. Strassner, about 65% of all German customers use a different setting than zero.
It is also a wrong perception to think if you will not use a different setting than the default setting, the investment is wasted.
The price difference is not really huge: it is around $130. The TOP box contains also a sophisticated RFI/EMI filter, which the regular version does not contain. Even MIT have recently come out with an impedance matching system on their top interconnects, although a very crude, since they cannot copy the much more sophisticated settings of HMS, as they are protected by patents.
MIT has 3 extremely spread settings, so you cannot fine tune anything here, but the fact that they implement the impedance idea, even if it is a much more simple design, would support the whole idea about the needs of such a device, which MR. Strassner saw a long time ago