Are the kh120 too small for hifi use in a 4 by 5m living room with 2.5m height.

I will be listening from 3m away.

I’m worried the watts and 5.25 inch driver will be not enough. Will it be near clipping for decent volume.

how about with the kh750 sub too. Does it take the strain off the kh120 5.25 inch woofer when enabling dsp feature.

kinda hard to get demo right now.

much appreciated.

This is the maximum C-weighted SPL for a pair of KH120As (loudspeakers alone and loudspeakers+sub) that

Neumann specifies at 2,3m:

Based on the above, at 3m distance (

see this calculator) a pair of KH120A should be able to reach a maximum of ~94 dB(C) SPL peaks if used fullrange, or ~101 dB(C) SPL peaks when crossed over to a subwoofer.

So assuming a generous 20dB headroom (for high dynamic range content and possibly some room EQ), you should be OK as long as ~74 dB(C) SPL (KH120 fullrange) / ~81 dB(C) SPL (KH120A with sub) average level is acceptable to you.

It would be best if you have access to a C-weigthed SPL meter to measure your current average SPL, and then see if the above would be enough for you.

Please also note that this is a bit simplified calculation, you can also

see this diagram from Neumann if you want to do a more detailed analysis and calculations for specific frequency regions.

Hope this helps!