A few months ago we played Beeth's 5th. One part goes(@1/2 note = 80-90 or so) A___F___EFEDC___,repeat,etc.. With a 4 string Bass you would play the D and C up an octave. For me, I was using a Fingered Extension. I used the open A(half note), Fingered the F on the e-string (half note) with the 4th finger and then played the E with the 2nd finger (where the nut would be (8th notes here), F with the 4th, E with 2nd again and then shift/pivot fast to the D in the middle of the Ext. and then open C (half) on the Ext (1/2 note again). This repeats 3x each time it comes up in the 3rd movement(I think it's the 3rd). There are some other places in this piece to use the Ext. but this is the only hard one.
I now have a 5 string Bass and would be able to play this much easier. I guess the term double bass is in true form here where the Basses play the exact same part as the Cellos. I bet then in Beethovens time they tuned in 5ths, had 5-string Basses for this piece or played it up on the C and D notes for those without the lower notes.
I am currently lining up all of my Orchestra Basses to be fitted with Chromatic/Latched Fingered Extensions. If there are just a few things to play with the extension, fine I'll do it. If there are a lot of moving parts I will bring a 5-string. I played the Trout last year and this year with a Chamber Group. It has a few Octave jumps with Cs and Ds and maybe D-flats?. Anyway, the first time I used a 4-string and doubled the note in the same octave.. Boring! Then, I saw Hal Robinson play is with a Chamber group and he uses a Latched Chromatic Fingered Extension like the one I am getting. He would pre-fix the latches to the notes he had to play for the Octave thing. Looked and sounded great. Then this year I played it with a 5-string Bass and found it great to play it like that except I had to reach one string Lower to get the Note. I guess the Ext. would have been easier on the Bow for this one and less travel distance to the Lows as well..
So, it's a new Bass once you start playing those lower notes that you have played up an octave all your life. In talking with Hal after the concert I mentioned how hard it was to finger those eighth notes in cut-time in the Beethoven. He remarked 'sometimes it's just not worth it'. Meaning it isn't always best to jump done and play on Bridge cables at 80 miles an hour and try being in tune, in time and the notes coming off the bow.. I think?
I have a friend in another Orchestra and he is the only one in the section with a 4-string. There is one 5er and the rest have Extensions. He says that sometimes the Principal will have only 1/2 go down. Sometimes he will do that on some note even written up to fill out the section. I do that as well when I bring a 5er. I sometimes play an octave lower to fatten up the sound of the Basses. Feels great when I do it. The Conductor must not give you any looks or you know you are in the wrong. Last week we had a returning conductor for the Christmas concert. Not a singe low note written, so I added a few..lol. After rehearsal I cleared it with him as he was fine how and where I played the sub lows. It makes you feel like you have a True Double Bass when you can go down a full octave below the Cellos.. +1, with the 5er..