The Energy Take Five Classics are some of the best of the very small satellite speakers. However, they must be set up very carefully so you don't have a dip in the critical lower vocal range.
Be sure in the speaker setup menu in your HK 347 that you have all five of them set to "small." Then be sure you have the sub/speaker crossover set to 100 or 120 or 150. Probably 120Hz or 150Hz would be the best to try first. Make sure you have the LFM-1 EX at the front of the room, ideally somehwere between the left and right speakers, but not on the side wall or middle of the room. The EzSet/EQ system can make mistakes. Be sure it has set the speakers to small and the crossover to 120. You can use the manual override to correct mistakes. The best is to use a Radio Shack analog (not digital) meter and a test CD to confirm the response at your listening postiion is as flat as possible between 30Hz and 200 Hz. You might have to boost up the frequency response a little with the manual EQ settings in the critical 100-150 area for voices
Be sure the X-Over toggle on your LFM-1 EX is set to "bypass." (the dial is now inoperable and the crossover is controlled by the HK 347 as it should be).
If this does not create a much better match then you could upgrade you speakers. You have somewhat of a mismatch with your sub and the 5 Energy speakers. The actual Energy sub that matches the original Take Classic 5.1 system is on sale at Costco for $99 thru October, model ESW-8.