Thanks for the explaination. Makes more sense now. From previous posts it looks like this can be overcome somewhat with amp power. I'm anticipating wanting to try that Delta 12LF with tube amps from 8 watts up to 60watts. Looks like the zMax is 93ohms. From what I read, this looks marginal in the 8watt range but above 20 should be just fine? On a side note, I'm wondering if the PSD2002 can be crossed lower? I ask because I thought that bi-amping could help with running the woofer, but it seems to me that the lower the HF can be crossed, the more seemless it would sound. Thoughts?