Just upgraded my speakers - do I still need the subs

@fritzenheimer  Listen to @tcutter -- Subs have two basic purposes;  (1) Extend low frequency response for speakers (not necessary in your case) and (2) smooth room modes for low frequencies.  The latter is more important and applies even where you have "full range" speakers that might actually go lower than the subs. With just two speakers your room will have bass nulls and spots that are boomy.  Adding subwoofers will smooth these out and make for more consistent bass in the room.  You'll hear the difference when you shut them off.

@wyoboy +1

@fritzenheimer 

Below are waterfall graphs from my room which may provide a sense of room mode reduction. Frequency and amplitude (volume) are on the X and Y axes, respectively. The Z axis is the time the wave persists in the room as it bounces back and forth between the walls, ceiling and floor. You can see that "Subs on" is fading more rapidly than "Subs off".

Adding subwoofers creates additional waves that interact with the other waves by adding a peak to another’s null and a null to another’s peak. This results in a smoother response but also shortens the time spent reverberating because the wave has been cancelled or at least greatly reduced in amplitude.

There are still significant benefits of using multiple subs in a system that already has decent low end extension because you get a smoother frequency response and a shorter reverberation time. The bass will be better, faster and smoother. 

KEF Reference series loudspeakers are very amplifier sensitive. Make sure you have the right amplifier before making any future decisions.

Yes.  I had the Reference 5’s and used a sub most of the time.

I have the Reference 5 Metas. And yes, I use two subs. Where did buy your Ref 1s? Can the dealer help? The dealer (Best Buy)helped me set up and integrated them. Not sure I could have done it as well on my own.