F15 or F12 (+ F12)

[shadow]

I've started setting up my sound system. I'm starting with a CBM170se pair and a Rythmik F12 powered by Yamaha RX-A3000.
My goal is to configure the system such that I'll enjoy it during the setting up period (over few years) while still have some degree of freedom on the final configuration.
I could justify 170 pair easily because it could serve my 2.1 initially and move to surround later or 2nd room.
However, I'm not so sure on F12.
1. should I invest more and get F15 or
2. should I stay with F12 and later add another one if needed?

My room is 400ft2 open to 300ft2 kitchen.
I'm buying a Rythmik because of it's clarity but my son will definitely try to rock the house whenever I'm not looking.

[curtis]

Two subs located in different areas of the room will help smooth out the room's bass response.

That is a pretty large area to fill. I would start with a F15 to see how it works out, with the thought of adding another F15 later.

[shadow]

Thank you for your response, Curtis.

Although we don't usually crank up the volume, maybe it's better I invest a little more now than wondering how a 3dB bump up would sound like every time I turn on the system.

[curtis]

The 3db bump will be noticeable when you turn the volume up.

[shadow]

I'm sure my son can test that part .

-- Joohee