Originally Posted by xhattan
Thanks a lot Steve. Just some minors inquiries about your comments:
1. Does this means that Audyssey will upgrade the sound of my 3005 eggs or downgrade the sound of the LS50? The eggs are very good speakers and play at reference levels or above with no stress or distortion whatsoever, warm and very detailed sound. Blend perfectlly with the HTB2SE and the Elite AVR.
2. KEF´s webpage states that the 30Hz frequency is (+/-3db) for the HTB2SE sub. My ceiling is 8" high and one sub would be on the front and the other at the back of the room.
3. MLP is 9". As I said, movies and music at reference level (not very often, only when I´m alone) sound great, usually in Direct Mode or in a THX mode. So, are you saying that maybe I don´t need an amplifier and a top of the line Denon or Marantz can do the job on their own?
Again, thanks a lot pal.
1. No it won't up-grade the KEF 3005 eggs nor downgrade the KEF LS50. What room equalization (REQ) does is compensation for the room anomalies based on a target curve. This is done via test tones from the speaker and received at the microphone which is then processed via algorithms on the receiver and implemented in real time by the DSP chips. The correction applied to each speaker is like the inverse function of the actual received signals by the microphone in the form of minimum phase filters. For example - a 10dB peak at 250Hz is brought down to the target curve or a 10dB dip at 80Hz is brought up by 6dB to the target curve. This will then smooth the in-room response for each speaker so that each speaker is equalized to a target curve, thus they tend to sound similar.
2. Was looking at the owners manual for the HTB2SE sub, but good to know that 30Hz is the -3dB point. If you haven't done so already, a simple sub crawl test as outlined in the following youtube video by Axiom Audio will give options on where to put the sub in the room:
3. Using the following web app: http://myhometheater.homestead.com/splcalculator.html
, with the LS50 speaker sensitivity of 85dB/W/m, MLP being 9' away and assuming the speakers are corner loaded to the wall (1.5' to 2') in a two-channel stereo setup configuration the power requirement on a per channel basis is 95W to reach a peak of 105dB at the MLP.
If you use the same speakers for the front sound stage consisting of LS50 (i.e. front left, center and front right), then on a per channel basis the power requirement is just 63W to reach a peak of 105dB at the MLP.
Going with all LS50 in a 5.0 surround sound setup, the power requirement on a per channel basis is just 38W to reach 105dB peak at the MLP.
These are easily achievable with most modern receivers (such as Denon/Marantz) and within the power limits of the LS50.
So yes, you don't need external amp in this setup. The important factor is placement of the speakers in the room and the 'throw' distance between the speaker and the MLP. Changing these parameters will drastically change the amp power requirements. Note that KEF has stated that the LS50 has a maximum continuous power rating of just 100W and exceeding this may damage the driver.
Additional note, most people will find listening at reference level to be too loud and uncomfortable. Generally the Main Volume is set much lower than this (around -20dB) and this helps reduce the power demand of the amp by a factor of 100x less. I.e. less than 1W in 2-channel mode given the calculations above.