I wanted to address "Digital-Sound's' post point by point.
First off, I LOVE my StageScape system!!! There are several missing features and things that need to be improved. I repeat, however,I love this mixer! I can't wait for the next firmware/software update and even the next generation of this mixer. Here are a few things I would improve. Most importantly, Line 6 needs to partner with a top notch mic preamp maker or design some of their own. If a low end company like Behringer can do it (Midas mic pres), than certainly Line 6 can pull it off. Line 6 should not be relying on complex DSP processing to doctor up lower quality mic pres. Why did Line 6 produce such a magnificent sound system and not bother to provide it with top quality mic pres? I don't get it. It would be nice to see the Quick Record feature increased from 20 seconds to a few minutes. Twenty seconds of sound is a little lean for a decent sound check. I would also like to see more shared vocal and instrument presets in the Line 6 community. This one is on us, the user community. I would also like to see Line 6 spend more time on providing top quality instrument, effect, and mic presets, although the ones already on the M20d represent a fine start. More boutique presets from top notch artists and sound engineers would be awesome as well. I would like to see Line 6 increase the number of global FX to eight if possible. Four is rather limiting. I would add a few buttons or perhaps even sliders so that all of the M20D's channels could be controlled easily from the same screen. I would incorporate the 31 band EQ into the mixer instead of relying on the DSP in the speakers for this functionality. If that requires increasing the DSP power in the mixer, so be it. This would allow other manufacturers' speakers to be used more effectively with the M20d. One of the prime benefits of digital mixers is eliminating the need for outboard signal processing. Not including a 31 band EQ in the mixer (like most other decent digital mixers), is a glaring omission. An omission that is made more painful by the current state of affairs with the L2m/L2t.
I would also fix the issue with only a couple of USB Ethernet adaptors being compatible with the M20d. You need to be able to upload any Ethernet driver to the M20d so that a wider range of Ethernet adaptors can be used. When these couple of Line 6 annointed adaptors are discontinued by the manufacturer (at least one has been already), there will be a mad Ebay scramble to locate ones that still work with your M20d. A failure point of built in obsolescence.
Line 6, please spend some more time tuning and testing your speakers! If you cannot even detect a loud rattle coming out of your speakers, my confidence as to how much time and expertise has been applied to tuning them and finding their optimal sound design has been understandably severely shaken.
I appreciate the point the user 'Digital-Sound' made about fans on amplifiers but think it is somewhat irrelevant in a discussion of powered speakers. I expect to see a fan on an amplifier(not an amplified speaker) but not necessarily on a powered speaker. One of the great benefits of a powered speaker is that you can use the motion of the speaker cone to passively cool the amp. There are no such moving parts on an amp that provide this ability, you must use a fan if your amp design generates too much heat. Although fans may be used in SOME other powered speakers, many use passive air cooling, and if at all possible this is a superior approach that eliminates the fan. By eliminating the fan they also eliminate a possible point of failure and of course in the example of the L2m/L2t, the rattle. If the cabinet design or amount of heat generated by the amp in the Line 6 speakers requires them to use a fan I would try to do the following. First see if a redesign of the speaker cab and power amp can get the heat level down low enough to use passive cooling. It that proves to be impossible, make sure to procure fans that do not rattle, have a long life span, and very importantly, include a top notch temperature detecting fusing system so that at least the user only has to fix a fan and replace a fuse if the fan dies (not a power amp, DSP motherboard, whatever.). Fans fail sooner or later. Therefor, I would encourage Line 6 to eliminate the fan if at all possible.
I am happy that you are one of the lucky consumers who found a pair of speakers without this rattle although I suspect I could reproduce it in seconds even on yours. You may just not have noticed it or have your EQ set in such a way as to minimize it. Just turn the speaker volume up and hit an E chord on a hot clean guitar signal and I warrant you will hear it even on your system. But again, maybe you just got lucky. Many of us have not! As far as the "finding an L2m that does not rattle". First off, how many times should we expect a consumer to take back bad speakers before finding ones that work? I bought four and they all had the rattle. Finding ones that don't have the rattle is rather impractical. Are you going to go to a store and ask them to rip open the boxes of many speakers so you can test them? Even if they were willing, most stores only stock 2-4 speakers at best at any one time. And let's not even go down the road of what a pain it is to have to swap out speakers when they are mail ordered (shudder).
Let me clarify my statement about the M20d "not playing well with other speakers". This comment was targeted solely at the omission of the 31 band EQ with anything but Line 6 (L6 Link) enabled speakers. Yes, of course the M20d still sounds good (but not as good as it could) with other speakers but is missing the critical sound shaping capability of a 31 band EQ. Yes you can use the M20d's parametric EQ to mitigate the problem partially but this is nonsense. Every pro sound man uses 31 band EQs for live sound. Buying an M20d to use with other speakers is like buying a Ferrari that does not have headlights. Critical functionality is missing. To get the most out of this system you are forced to buy Line 6 speakers, and the problematic paradox is that, currently their monitors/small mains (L2m/L2t) have a major manufacturing defect.
Regarding "hanging in there". I have no choice. I am already out of my return period with my M20d mixer and L3s subs. I also own the L3m speakers (I was compelled to purchase them because of the problem with the L2m/L2t). I intend this post to be constructive feedback for Line 6 and as a warning to new adopters of this awesome sound system. Line 6 needs to jump on this issue with their small speakers and fix it! Simply acknowledging it is not enough. They have not fixed the issue yet! If I were the CEO at Line 6 I would fix the problem on the production line for all new speakers and issue a factory recall and fix for the existing ones that have this issue (at their own cost, not the consumers).
It is NOT just hype! This mixing system does represent a paradigm shift for Line 6 and for live sound in general. I could go on and on about how many features I love in this mixer. The recording functionality alone is almost worth the price of admission although I understand that the latency is too high to use the M20d as a proper DAW (have not tried it yet). However, after spending thousands of dollars on this system I do not think it is too demanding to expect not to hear a loud rattle when I play through my PA; something even the cheapest bargain basement sound system is capable of. I want to see a next generation M20d and many software/firmware/hardware improvements. I don't want to see the StageScape system die on the vine to the sound of a pronounced death rattle in my mains/monitors.