What is 2-filter vs. 4 filter?

[BamaBill]

I've read a few discussions lately where people are discussing how many filters their machines have. What are filters and what advantage is a 4 filter machine going to impart over a 2 filter or vice versa? I noticed that the MXT I have is a 3 filter machine. Never saw anything about 3 filter machines in these discussions. What's the difference?

 

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[The.Boomer]

The higher the number the more money is filtered from your wallet.

 

[Tom_in_CA]

It's the # of computer filters that the signal has to pass through, as it is processed to eventually become a "beep". The outcome is that 2 filter machines have less depth usually, but are better in iron (for target separation and target averaging). 4 filter machines are deeper seekers, typically (but not always) have a longer drawn out beep, but are not as good at target averaging and separation. An example of a 2 filter would be the Tesoro Sabre or Whites classic, and an example of a 4 filter would be a 6000 di pro, XLT, etc....