Unless you are rocking a super duper cartridge and arm, your system is unlikely to produce anything below 30Hz. M80s will get you close and M100s will definitely reproduce even lower.
Do you really need the center? Maybe you can answer that by experimenting with a v4 front when you receive it.
Last edited by Mojo; 12/22/2012:29 AM.
House of the Rising Sone Out in the mid or far field Dedicated mid-woofers are over-rated