Required to play a Bose L1 w my Fender jazz

Either of those preamps would help.
I'd go for an amp sim like a sansamp if possible.

 

I feel your <insert adjective> pain.
99% of the time I use a band-provided BOSE which did get the 4 "bass bins" replaced by a Seismic 2x15 to save transport weight, eliminate clipping the BOSE low end, and setup time PLUS it pushes more air(field-tested in the pasture next to home). The L2 crosses at an even-worse 140Hz so a large portion of my upper string & notes go through micro speakers. Signal chain here that makes it more tolerable is: Line 6 BassPODXTLive(SVT sim that I tweaked the heck out of) ->MXR 10 band EQ->BOSE.

Run the EQ and the Sadowsky pre into a channel with preset "00" which on the L2 is "flat".
You can try the BOSE bass guitar presets if you like but IMO you'd do better with the above.
After that, grin and enjoy as best you can.

I HAD TO run directly into the BOSE once when the Line 6 cratered(electrical issue at the venue fried the transformer). After the lovely experience(sarcasm), I got a SansAmp Bass Driver Programmable(cover band = tone must change for the song) and carry it. It saved me once when a patron's drink went into the Line 6.

BTW, the BEST sound had in 2014 was:
1) Outdoor gig with a backline of SansAmp->GK 900(?) head->SVT 8x10
2) A double-booked night with the first gig on my Line 6->SansAmp->dbx166xL->QSC2402->two ACME B2's

That explains the label "BOSE abuser".