Unsound, I've heard some bad sound from Apogees as well. Some of the early models had voicing problems, and also differed within production runs. You can see this in the reviews and the response measurements. Overall performance and consistency improved radically over the years.
In two channel reproduction of recordings made in large venues, it's long been known that a downtilt of 4-6 dB actually sounds better than flat. For small ensembles, flat is better. This is a shortcoming of two channel recordings, not the speakers -- basically, forward-facing cardioid microphones don't pick up enough ambiance, which, in a large hall, is attenuated in highs, and close miking is even worse. Some speakers take the flat approach, some the downtilt approach. I don't think one or the other is right.
One problem Apogees do have is a hollowed-out bass response, with a peak at the very low primary resonance. Essentially, they traded away flatness for superior bass extension.
Still, they made some superb speakers. I think one of the main reasons they aren't more popular now is that despite Graz's life-saving support, the woofers are very costly to refurbish. I've seen long-time Apogee lovers say that they're no longer an economical proposition for that reason. This may explain relatively high selling prices -- if you'd spent a lot to repair yours, you'd naturally want to recoup some of it. And of course, the larger planars will always appeal to a relatively few people, e.g., those with dedicated sound rooms or dirt on their wives. The Tympanis suffer from this problem as well, which I think is why they can be purchased for prices that are insanely low compared to more reasonably-sized speakers of comparable quality.
In two channel reproduction of recordings made in large venues, it's long been known that a downtilt of 4-6 dB actually sounds better than flat. For small ensembles, flat is better. This is a shortcoming of two channel recordings, not the speakers -- basically, forward-facing cardioid microphones don't pick up enough ambiance, which, in a large hall, is attenuated in highs, and close miking is even worse. Some speakers take the flat approach, some the downtilt approach. I don't think one or the other is right.
One problem Apogees do have is a hollowed-out bass response, with a peak at the very low primary resonance. Essentially, they traded away flatness for superior bass extension.
Still, they made some superb speakers. I think one of the main reasons they aren't more popular now is that despite Graz's life-saving support, the woofers are very costly to refurbish. I've seen long-time Apogee lovers say that they're no longer an economical proposition for that reason. This may explain relatively high selling prices -- if you'd spent a lot to repair yours, you'd naturally want to recoup some of it. And of course, the larger planars will always appeal to a relatively few people, e.g., those with dedicated sound rooms or dirt on their wives. The Tympanis suffer from this problem as well, which I think is why they can be purchased for prices that are insanely low compared to more reasonably-sized speakers of comparable quality.