Originally Posted by AVSF458
I have the Ascend Acoustics Towers and Horizon with RAAL. They are rated for 4 Ohms but are supposed to be very efficient.
With high efficiency speakers such as the Sierra Towers and Horizon (around 92dB/W/m) and if you sitting at normal seating distances as well as implementing bass management, the 4520CI should be able to drive your Ascend speakers to reference level.
The need for external amplification by using the 4520CI as a pre/pro is at best questionable.
Marantz SR-7009, Oppo BPD-93, MTV 7000D, aTV, Harmony Home Control remote, KEF E301+T101, MiniDSP (2x4)+(10x10HD)+(DDRC-88A), Emotiva 2xXPA-5 (Gen2), Rythmik 2xF12G+2xF8, HiMedia Q16, LG 55EC9300.