I promised you a review of the M2500, and here it is. I also promised a recording of this, and my L2000 so that it was easy for you to compare. But the same day as my M2500 arrived, my L2000 got traded for another bass. Life is indeed what happens while you’re busy making other plans! This is based on some quality time in front of my amp. And english is NOT my native language...
All the technical mumbo-jumbo you can read at G&L’s website, so I won’ t bother with it… Will just like to say that this was a custom order. Body binding, quartersawn maple neck, premier finish (which gives you a swamp ash body instead of basswood), and this 3-way switch for each pickup. The bass was ordered in the beginning of June.
First impression, opening the case and picking the bass up, was WOW! This thing is just beautiful! Flat out gorgeous! Until you get to the back of the body. A top-of-the-line bass likes this, with this kind of price tag, I had expected something a bit more up-marked for control cavity covers. G&L has chosen to use 2 plastic covers, which is secured with wood screws. One of the screws on the control cavity cover was already stripped! This is easily fixed with a toothpick and some glue. But when paying over $2.000 for a bass, repairing it is not the first thing you want to do! The battery compartment also has this solution. Wonder what comes first: losing one of the tiny screws, or stripping the hole? This is simply not good enough!
Jumping to what matters, sound, WOW! is a word that still applies. Starting with the coils in series mode (which I reckon is the factory default), this thing punches you in your belly! The sound is very much like the L-series. But perhaps a bit more refined? I always felt that the L in series was a bit too much for most songs/gigs. The M, I feel, is a tad more civilized. Single coil takes you straight to J-land. And with the balance in the center, the coils are hum canceling. Very nice indeed! Parallel mode is, like series mode, known from the L series.
The big difference from the L series lies in the EQ department. The 3-band eq on the M is powerful, and quiet! The frequency of each band is centered at just the right place. Cutting the mids in series mode helps tame the sound a bit.
I think that this switch system should be standard on this bass. It makes it so much more versatile! In series mode, it’s very aggressive and powerful. Just like the L series. But just flick a switch, and you are on your way to a jazz gig(whatever rocks your boat…

. I’ve read about people modifying L series with Audere 3-band preamps and so on. I have not tried them, but I can easily imagine that you will get the same sound as the M series.
I have a nice ( I think!) collection of basses (Alembic Europa 5, Alembic Elan 5, Warwick Streamer Stage II 5), but I think this can easily be my #1. If it got lost, I would order another one!