After just about a year of learning to play the low, .195 C# string and recording with it ,i felt pretty good about it's usefulness on a bass guitar. I recorded a bass track with the Adler 11-string through a one of a kind Basson B-310 cab and also a DI. I could hear the low,open C#. I was plugged in to an SSL G console and recorded into Pro Tools HD V.6 at 96k. I thought it was clear and sounded great.We mixed on another SSL G(plus) at Paramount American on NS-10m's , switching to the built in overheard monitors.The bass sounded great and you could hear the low C#. The real ear opener happened while mastering at Paramount Mastering with Bill Dooley.He uses an $8000 pair of Adams monitors. Three way, tri-amped at 300 watts.They are made in Germany.Audiophile heaven. When those notes ,the low A on the 3rd fret ,F# string and the open 17. Hz C# sounded...... It was like standing in the 32' rank of a pipe organ. I have never heard anything sound like that coming out of a speaker. The low C# was as clear as the regular low E on a 4 string. i didn't know a bass guitar could sound like that. Interestingly,the speakers bottom out at 30Hz. Jauqo,you have forever changed the meaning of "bass". I just used that string on one tune. You have an entire CD on a Sub Contra 4 string. Now I can see the C# string being a viable option . You need the right speakers to reproduce it,but we could still hear the string on a pair of Sony head phones.