I would be pairing the two cabs or using separately, the 115(14.5kg) is identical to the 1126 size vice, but with a different character of its own with the 1126 being more clean & modern sounding is my guess ? Every one who ever heard the 115 are amazed by the sound and authority, it sounds great with any bass(not least a P-bass) or low B, clear warm sound, had it for around 10 years and I have not heard anything better in the new cabs I tried (berg, eich, vanderkley, genzler, tecamp, ect.) I would love to add more of the great TKS sound with a different voicing, I could not imagine that I would not like it ???? I think anyone who have a TKS cab dont sell it,, its just real creamy quality