The Libretto center Channel loudspeakers offer the ultimate in center channel performance. It employs two 5" Pentacone™ woofers, one 1" silk dome tweeter and one 4" Mini Mid range Coupler. The 5" woofer and Mini Mid are our own design and the cones have a patented glass fibre weave. The cones are actually 5 sided. Hence, the name, Pentacone™. The cone design lowers resonance in the critical "mid-range" region, 160Hz-1280Hz. The baskets are cast magnesium with pole venting. A butylized Meuller surround of varying thickness further reduces resonance and is an integral part of the design. This allows for a smooth transition from the woofer to our Mini Mid.
The 1" tweeter is a masterpiece from Denmark. The 26mm coated diaphragm is made of fabric and silk. It has a neodymium motor, a copper clad aluminum voice coil and has a vented rear chamber. The tweeter has an aluminum phase plug. This design permits improved sensitivity allowing the tweeter to act as a perfect piston beyond 23KHz. The frequency response of this tweeter actually extends beyond 46KHz. Dispersion and power handling are excellent.
Conventional center channel designs, a single tweeter between 2 woofers, generally exhibit poor off-axis dispersion. Output is often sown more than 8db at 30 degrees. The Libretto's unique off-axis design virtually eliminates this problem. At 30 degrees off- axis, output is less than 1.5db. we have added an adjustable "presence control" to the crossover design. Output from 300Hz to 3000Hz may be reduced up to 8db . this adjustment allows for perfect matching to the characteristics of any listening room. being able to alter the output has another distinct advantage: the user can alter the loudspeaker's "power response". This is extremely important if the Libretto is to be used with any other brand of loudspeaker.
Overall Rating for Angstrom Libretto Center Channel Speaker