Jack mentioned that G1 has more emphasis on bass and less on treble in comparison with B1, which emphasizes mids and highs with slightly reduced bass, and MAM is more similar to G1.
This is incorrect. The G1 is actually the only module of the 3 fixed ones, that the MAM is kinda hard to replicate that exact sound signature. The MAM and B1 are easily the most similar, if we're just talking blanket statements.
It's always going to depend on the IEM of choice, but as a rough outline you can think of the modules like this:
S1: Adds a bit of mid-bass.
B1: Leans out the bottom end, this lets more focus be put on the mids and treble since there's less bass to compete with. Wider sound stage compared to the S1. I use the B1 for more critical listening, reference type stuff
G1: Bump in the sub-bass range, adds a bit of sparkle up top. Still wider than the S1. I keep the G1s in my IEMs because they're more fun, I like bass. Its ideal for EDM, some more bassy metal stuff, and rap (especially trap, I named it after Gucci Mane for this very reason)
The MAM (Manually Adjustable Module): Allows you to close off all the ambient ports if you want for the most isolation, or open them up, much like going from a closed back headphone to an open back, on the fly (plus everything in between, hence being able to achieve the sound of the
B1 and the
S1).
- When you have the MAMs fully closed, you're going to get the most bass response. (Like a closed back headphone)
- Adjusting the thumbscrews a bit forward from closed will open up the ambient ports, while not tensioning the membrane yet leaving the membrane in it's most floppy position. This floppy position absorbs ALOT of that bottom end, kinda like a net in a batting cage really. You can really drop the bass off signifcantly in this position.
- Continuing to roll forward, the basket attached to the thumbscrew will begin to tension the membrane within the module, now you can start to dial in the amount of bass you want back in your sound signature.
- When the thumbscrew is fully screwed into the module, the basket is fully tensioned against the membrane and the ambient ports are still open. This setting allows you to regain nearly as much bass as when the MAM is closed, only with a super wide soundstage and airy presentation. (Like an open back headphone)