Lak has probably got the two best models that they build ( in my opinion ). The Studio uses the same "mid-woofer" that the highly reviewed ( and excellent sounding ) $4000+ two way Legend mini-monitors use. As to the Signature III's, they use a completely different bass alignment than any of the other models use. As such, i think that this results in MUCH better ( and tighter ) bottom end output and control.
Contrary to popular belief and even though the cabinets look very attractive, the internal build quality on these speakers is NOT as good as one would hope. I have worked on and repaired a few different Legacy speakers, each time finding various design / construction flaws. Let's just say that "consistency" is not one of their strong points. They do use very good quality drivers though and the prices compared to other speakers using similar drivers is very reasonable.
Given this information, a "tweaker" can take a pair of these and REALLY go to town on them. I am referring to internal wiring, tightening of connections, proper placement and amount of damping material, re-alignment of ports / port size, etc... The results should be very good if done properly since you're starting out with good quality drivers and a nice looking cabinet to begin with.
As such, i will state that these speakers in stock form are VERY system and taste dependent. You have to work with them quite a bit in order to squeeze the best performance out of them. They are MUCH pickier than some other brands. While this won't make me any "brownie points" with Legacy owners, there is a reason why they have the reputation of being the "hi end version of Cerwin Vega". They are relatively high in efficiency and tend to "boom" and "sizzle". HIGH current amps are a must to help control the bottom end on these speakers. On top of that, something that sounds "laid back" or slightly soft on top would probably help things out in terms of the "hot" high end that these speakers typically produce.
The larger models with open air woofers might be a different story in terms of the bass response. Due to the overall lower Q of this design, they might actually come across as being "lean". Sean
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PS.... Please don't hate me for sharing my honest opinions and experience. After all, if we all liked the same thing, there would be no need for this forum or multiple brands of gear. If you disagree, please share your opinions and findings. After all, that is what the poster is looking for: feedback and multiple points of view.