Heard about these guys from various Facebook Groups, and wish I'd heard of them sooner! I have an Ibanez SR5005 Prestige which is the wonderful full-on wenge-on-wenge-on-everything model with Bartolinis, which sounds amazing- except for that preamp! I looked at their options, and they had a Darkglass 3-band preamp, with availability for an A/P switch (which this bass sounds excellent in Passive mode). Recently got it back from my tech, and just wow- it's exactly what I'd hoped for! The Darkglass' Bass/Low Mids/High Mids pre works perfectly with this already woody, growly bass, and couldn't be happier. Will definitely use them again when needing to upgrade a preamp!