As suggested in the introduction, the Unified Center Channel is a design that can be used with many different main speakers. To help achieve a uniform timbre match between the center and front speakers, you have your choice of three different tweeters. The Dayton Titanium tweeter is great for matching the Dayton Budgets while the Dayton 1-1/8" Shielded Silk dome tweeter option will work well with the DII's and other 5-1/4" Dayton MTM designs.

Dayton Titanium and Audax TWO25F1

All the inductors are 18 gauge and the resistor directly adjacent to the inductor is its DCR. The one exception is R2031 in Net 2, which is a 5 ohm resistor + the inductor DCR of .26 ohm. L2021 in net 1 was deliberately spec'd to have the rather large DCR of 1.18 ohm. This raised the impedance minima at 100 Hz to be just below 5 ohms, and besides making this for all practical purposes an 8 ohm speaker, helps with the baffle step compensation. Changing to a lower DCR inductor will "add" roughly a dB of B.S.C., or adding a 1/2 to 1 ohm resistor in series will remove another dB or so.

"Note that only the attenuation resistors R3051 and R3061 changed to 6.5 ohm and 25 ohm respectively to accommodate the Audax (TWO25F1) tweeter." - Curt

Dayton 1-1/8" Shielded Dome

The Shieldie option was modeled in LspCAD, based on the PE CLIO files. The only crossover changes made to replace the 270-055 metal dome with the 275-075 shieldie, was in the attenuation resistors R3051 and R3061. R3051 which was previously 4.5 ohms will now be 6.5 ohms, R3061 which was previously 10 ohms will now be 30 ohms. If you are retrofitting the Shieldie in place of the metal dome, minor adjustments to the physical tweeter cutout will be required as the shieldie rear chamber is 1/4" wider than the metal dome, and the flange is 7/16" larger in diameter.