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It would show up in their FR then.
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Oh but it does show up in a measurement. Here are two near field measurements. One of an AVA15 and the other of the 390. The difference is obvious.
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As for high end rolloff on the Avalanche 18, there is some, but it shouldn't cause any dips in response as long as you don't use a crossover higher than 80hz
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I won't talk about dips, but since the crossover to the sub isn't a brickwall, the linearity of the driver beyond the xover point is indeed relevent. So it only makes sense that a more linear driver in the upper frequencies would sound punchier than one that rolls off the high end to a degree.
Now yeah, the rolloff in the last graph you posted is certainly not bad. Only ~4dB down at 100Hz, right? Still there though...so I guess all I am saying is...blaming others thoughts about the Ava's lack of punch on their penchant for higher distortion may not be entirely correct. It could be...but I think the ava's roll off also may be a good portion of it. We've yet to be given a reason to think the Ava has abnormally good upper frequency response.
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If you were in the states I would probably be up for it, but I wouldn't want to take the risk of one getting damaged (or lost) sending it overseas - you can't really go out and buy a replacement.
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Hey, what about a Klippel? I am pretty sure npdang (he's in CA) would test an Ava 18 for free. That'd be much cheaper, easier, and safer than sending one overseas. Quite informative too!