Using 7350a Sub with three Genelec 8340a speakers

[ttman]

Genelec recommends using the 7360A subwoofer with the 8340S 5.1 system. I was wondering if using only three speakers makes sense and provides high-quality sound when using the 7350A Subwoofer?

 

[Kyle_PL]

Let's look at normal STEREO, and Genelec specs.:

Genelec 8340A - 110dB (100Hz-3kHz) => 2x Genelec 8340A - 113dB (100Hz-3kHz), and let say 109dB from pair for lower cut-off at 65Hz (65Hz-3kHz).
1x Genelec 7350A - 104dB (30-85Hz, so 30-65Hz too)

So Genelec 8340A (x2) + Genelec 7350A (x1) is very not optimal! For 3x Genelec 8340A, will be even worse.