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I am in complete agreement with Bing on this. It almost seems like Line 6 is avoiding releasing this valuable piece of info. There is no Line 6 dealer in my area. I have no choice but to order online. I plan to purchase a new amp and cab. I was wanting a Lowdown 400. I would like to go with a Line 6 cab as well, but I usually prefer to use 15" speakers. I was trying to decide whether I want to purchase a Peavey 2X15 cab or the Lowdown 410. I wanted to compare specs... but since this said the info is "not available yet" over a year ago... and is STILL not available... I have serious reservations about buying this cabinet. I will stick with Peavey cabs. I know they sound great, are reliable, and there is a local dealer. Plus they're not afraid to post their specs.

I have - after a few failed attempts - gotten this reply from Line6:

Hi, Though they are made for Line 6, they are essentially the same as the Eminence Basslite Speakers: http://www.eminence.com/pdf/Basslite_CA2010.pdf so: 48Hz-7kHz Keep in mind that in a real world scenario frequency response in guitar and bass cabs is not really all that important. Most speakers in guitar and bass rigs have pretty poor frequency response in comparison  to studio monitors, FRFR P.A. speakers and the like. In some speakers like the Celestion G12T-75 this is actually desirable and serves like an EQ almost. Spec sheets are measured (usually) at 1 meter in an anechoic chamber so frequency response in an actual acoustic environment is going to vary wildly depending on location and position. Also, in a 4X10 closed back cab bass frequencies are going to be accentuated because the frequencies are going to "couple" together due to speaker position.  In short, the Low Down cabs are going to have more than enough low end. Still I would suggest checking on out in person before purchasing if it's a concern. Thanks, David 

These specifications are for the bass units. Then of course there is the tweeter to handle higher frequencies. A local music store found info on this - I do not know the source so I can not guarantee that the info is correct:

The tweeter frequency range is between 1.5KHz to 22KHz. The optimum cut-off frequency is somewhere around 2KHz. Outside of this frequency, the roll-off is quick. The rated power of the tweeter is 20 Watts.

I suppose this would all-in-all give a frequency response of 48-22,000Hz.