*My goal is a balance of quality of sound (freq resp., phase, imaging, etc) and dynamics.*

I'm pretty sure on the lower point (500hz), based on my drivers (see below); but i'm unsure of the upper x-over point. Anywhere from 3k-5k - it's well above the Fs of the tweeter.

I already have my amp to drive the woofers (Acurus), and the Mids (Sumo), but i do not have the amp for the highs yet.

This is what i asked in the 'loudspeaker' forum:

*-i asked this to figure out what power range of amps i should be considering.*

**So i'm wondering if anyone could point me to a function/equation that would allow me to calculate my power req's of my upper end amp based on the x-over point.**

**If you have any other input on the 3k - 5k x-over points, please chime in.**

i this forum i ask you this:

**tell me why i should consider tubes for the High Freq amp?**

i am considering getting 4 (not 2) of the vifa tweeters mentioned below and running them dipolar... any input on that? (and would the drop/gain in impedence, from 6 ohms for one driver, to 3 or 12 ohms for a pair per side, be of any benefit in getting more sound out of your recommended tube amp?)

components:

**X-Over:**3 way active w/ low pass, band pass, highpass x-over points. Each portion will have a level control.

**LF driver:**2 x A/D/S 312rs.2 12" dual 4 ohm VC's sens: 92db; nom. power handling: 600w rms

**Mid Driver:**A pair of Gallo Micros, [they claim to work from 90hz and up... but i was unsatified with them as rear/surround speakers] so i'm using them as mids here. 100 watts power handling above 100hz, sens: 92db

**HF Driver:**Vifa D27TG-05-06. 92db sens, and 100 watts above 2.5khz

**LF Amp:**Acurus A200x3. 200watts into 8 ohms (315watts into 8 per Audio Mag [r.i.p.]) -- yes, that leaves one ch. to spare (hehe) maybe an active Adire tempest subwoofer?

**Mid Amp:**Sumo Polaris II. 100+ watts into 8 ohms

**HF Amp:**to be determined.

in the meantime, the A/D/S and Micros run as a passive x-over'd bi amped 2 way pair (at 500hz)