Nope, and regardless of what you might hear regarding opinions, opinions don't pay the rent, cash does.
Here is how the multi's work compared to the singles, and remember that a multi of any kind cannot, will not, and has not ever run more than 1 (one) frequency at the same time:
They work much like human brains, in that our brains can only think one thought at a time, not more than one, and certainly not ever 28 or 45 or 120. If we did we would be totally confused and so would the circuitry in the detector. The Minelab, Fisher, and White's, etc chose, as in chews as in chooze which frequency the detector might incorporate in one given nano-second for the sampling reading it received at the prior split-second. This means that the multis have to run V - e - r - y S-L-O-W-L-Y to process all that information. This in turn cuts down on the detector's capacity to perform to it's max RMS peak output voltage potential. In simpler terms, it slows the detector down having to select moment to moment which frequency it might try at that instant. It only gets it perfect one out of millions of times too, don't let anyone tell you differently either.
In the case of selectve frequencies, there is much more involved besides operational frequency, the way a particular circuit handles the information plays an even more important role in this regard. I would suggest that everybody should read more about this, and if I remember correctly Tesoro has some engineering notes about whether or not any certain or near ideal frequency would work better than another one too. In reality, a 6.5 frequency will find gold (or silver, or copper,etc) as well as an 18.75 or a 12 Khz. It all depends on how or how well it's circuitry handles the information.
The frequency myth is little more than a relic from the past where originally it did make some difference, but now does not. Yes, to some degree search frequency does make some difference, but consider this; The Tesoro Tejon, is one of the deepest single freq detectors on the planet with it larger coils, but it runs in the higher freqs, around 18+ Khz but the various 14 Khz other brands do not get as good a depth as them by any means. And a 5 Khz Fisher does not necessarily get any better depth either. However, there is also a discussion about which freq will find gold better, or silver better too, and that too is now a falacy due primarily to refinements in circuitry technology.
As for the older Compass detectors, most of them have a tuned coil. A tuned coil has a small circuitboard in it that is tuned to impedence match the surrounding soil matrix likelihood, and to keep them more stable in relationship to the rest of the sending/receiving signals. In fact the Compasses did the very finest at it and even today they match or oftentimes beat the depth and discrimination abilities of the most modern of current detectors.. They are a bit heavy by today's standards though.
Here is the bottom line, in fact it's a matter of not just philosophy, it's also one of truth; A detector manufacturer will likely claim numerous ideologies to make their sales a winner, but it's info may be part truth, part fiction, and part little more than renaming something that it already has inside it's box. And as far as frequency choices by using different tuned coils? Well, if there was really anything to gain from this concept, then why doesn't that always hold true with other manufacturers who use one frequency and others use another to do the same thing when the freqs are nearly 15 Khz apart? And of course the answer is, that there is no need to actually switch frequencies at all when operating a well-made detector of quality build and design.
In simplest terms, the operating frequency means less than squat, and it's been that way for at least 5 years now for the current metal detectors available to us. . And yes, as long as we stay below 20 Khz and above 3 Khz we could find or operate a detector just as well with one frequency as another in that broad cycle range. Just like a politician, the mfgs like to tell you what you want to hear, and not necessarily the truth.
The only really good reason to change the audio frequency (not the operating frequency) is to avoid crossover (inductance) talk between two different detectors, nothing more.
Have fun hunting.
EasyMoney
