Originally Posted by WillyWortel
I just bought a pair of these ls50 speakers. Before I had the b&w 685's which are also still very good speakers for the money. But after reading a lot of good reviews I had to audition the kefs. The difference with the ls50 speakers is really remarkeable, especially in the high tones.
At this moment the ls50 speakers are connected to my Marantz sr5008 receiver (100 watts 8ohm). I 'm just not that sure if an AVR is good enough for stereo use. Could I benefit by upgrading to another integrated amp by means of sound quality? I really want tp get the best out of these speakers.
Your Marantz SR-5008 has a 7-channel amp with bass management and Audyssey room equalization. When operating in 2-channel mode, it's rated to 100W per channel with a low THD of 0.08%.
The LS-50 are rated at 100W of continuous power so the SR-5008 is a good match here.
If you're sitting near field to the LS-50 and only use the two of the seven amps, I have some doubt you'll be able to hear much of difference between the Marantz and others in a blind objective listening test. The following should be considered.
(1) Bass management feature of the SR-5008, where you can direct the low frequencies (80Hz and lower) to a sub to produce the clean lower octaves. This can be important for getting that in your chest feeling that clean tight bass provides in the room. Note that the lower F3 of the LS-50 is 79Hz. If you're trying push the LS-50 to produce more output below it's rated frequencies, expect two things to occur: (a) more distortion and (b) higher power demand from the amp.
(2) Room equalization where levels, delays are applied based on your Main Listening Position and filters (PEQ) are applied to correct for the room. If your room is not treated or the listening position is less than ideal Audyssey will try and compensate for this. Some purists (audiophiles) don't like this and insist on perfection. If you go down this path, expect to spend large amounts of money chasing minute improvements.
Features (1) and (2) have a impact to sound quality and are not readily available on most integrated (including the rega brio r) amps. Modern AVRs do.