guys....i'm now researching subs...hsu, kef's new subs, sunfire etc.
(but admittedly love the dsp/eq modes in the new kef subs)
also reading of how 2 subs deal better with standing waves and room acoustics than does just one.
so i emailed kef and they said that, despite the active speaker only having one sub out,
that i can run 2 subs in my system:...
''You will need an RCA Y adapter cable. One end will have a single RCA
to connect to the LS50W, the other end will have two RCAs, one for each subwoofer.''
anyone running 2 subs in their system?
my place is small 11' wide by 14' deep and with another 11' behind me into an open kitchen.
I've auditioned those LS50's and they do satisfy the ears for detail but depending on the room configuration the bass might be lacking.
If I were to search for subs I'd do research on active subs that are known for musical character. Kef subs have never had the reputation for being stellar performers. I use Kef speakers for my home theater setup but I'm a Totem acoustic owner too. If I wanted to add a sub for your application I'd also consider totem subs.
Do not put the speakers in a shelf or close to a wall. You'd want the ports in the back of the speaker to have some room to breath.
If you've ever auditioned a Kef R100 bookshelf it has a very similar sound signature to the Kef LS50. I've run my R100 with a Simaudio amplifier and it sounds very good with a nice refined treble. Bass is taught just like the LS50 and the glossy cabinet is just as beefy and heavy like the non amplified LS50. The beauty of the wireless LS50 is the clean and powerful amplification.
I'd honestly get one sub and see how it performs in your room. You can move it around the room to hear audible differences in how it reacts with the room acoustics. Room positioning and room tuning is just as critical as the gear in many cases.
Depending the kind of music you listen too I would just listen to the setup as is. The Kef driver needs to be broken in. I'm not jaded...... the speakers suspension and other components in the speaker needs to relax and you'll notice a difference in how the music flows. Fresh kef drivers will sound better over time. This is definitely NOT your "brain conditioning". I found with my R100 and R300 the speaker just improved in SQ especially the mids and lows. The cross over in the Ls50 has a very pleasant treble. Now the new Q series (cheaper line) has modified the cross over as it seems they are tuning the speakers more for laminate hard wood floors the creates terrible reflection.
I've tested my R300 with Simaudio amplifier and in my room which is aprox 11' by 22" does NOT need a sub. The large bookshelf true 3 way (not common these days) has a warmer less fast presentation than my R100 (your ls50) but when the R300 were new they sounded muddy. Now that I put many hours on them over time the R300 would shake even your room configuration without a sub.
I'll have to say the imaging from Kef's proprietary speaker Q driver is very good especially for the price. If you want that full body sound you will need to fill in the lower frequency with a sub.
I like to tweak but my typical thing to do is to use a Blue circle Canadian made passive power conditioner and Audio Sensibility (CDN made) power cable.