I'm electronically challenged and my opinions are always based on my own personal experiences as opposed to what I read. I don't build them I just use them. I'm not sure exactly how BBS technology works. I've seen arguments saying Minelabs description is hype when it comes to how many frequencies are being transmitted and how it uses or interprets those signals. Something that seems to be tied directly to the depth I've been getting in high mineralized ground is how it handles hot rocks. I've noticed that how it compensates for ground minerals in discriminate mode is nothing like auto ground tracking on some standard VLF detectors where the all metal and discriminate mode are tied together. Personally I really don't care how it works as long as it works and it does work. The technology is different from any standard VLF detector I've ever used. One unique feature is in the way it handles hot/cold rocks which I have an abundance of in my area on land and on our beaches. These rocks are either higher or lower in mineral content than the surrounding ground and many detectors will see them as a possible good target and respond in the discriminate mode. On standard VLF detectors how the detectors responds to these rocks are based on the discrimination range. On some detectors like the Whites XL Pro, XLT or DFX with the expanded discrimination range you are given an option to use discrimination to knock these out. Many detectors with a narrower discrimination range will treat them like any other discriminated target with a partial response like falsing. I noticed when hunting gravel type rocky beaches the sovereign doesn't null or false over these hot rocks when using a proper sweep speed. It's not discriminating these rocks but is compensating for them just like Minelab describes in how the BBS technology compensates for ground minerals in discriminate mode so regardless of how many frequencies it uses this is would explain why they get the depth they do in my bad ground. So Minelabs claims might be closer to the truth than the naysayers claims. A bit long winded but this is how I see it and I'm sticking to it.