Now that my headache is gone I can share my test. I am not an expert so remember this is from an amateur but I felt worth sharing. The test was run as follows: Tripod mounted Realistic (model 33-2050) sound level meter (note that from 20hz to 3khz the meter is flat from 3Khz to 9Khz this meter reads on average about +3db and rolls off very steep at 10Khz on up). Wavetech precision signal generator. Tested the speakers with the meter approximately 2 feet away from the face of the speaker and put the meter on centerline of the tweeter when testing both the N26 and the N-center. My Pioneer amplifier using the left channel. Volume set at the position on the dial where I get 80db using avia. I then adjusted the amplification of the wavetech so that the sound level meter read "0" set on 80db range at 800Hz and the "C" weighting was used. What I was trying to do is see how flat the response is for the N26 and the N-center. Also I was looking for peaks in the 1khz to 8Khz range which might account for ther sibilance that I have posted about but did not know if it was the speakers or the source (TV, CD, DVD). Results (corrected for the characteristics of the sound level meter): N26 well what can I say except outstanding. It was -3db at 65hz and again -3db at approx 20kHz. From 70hz to 18Khz the speaker varies no more than +/-2db. A slight peak of +3db from 7kHz to 7.5Khz . The crossover is at 3kHz and there was no noticible imperfection there or around this frequency. N-center well not as good this speaker is a bit "brighter" than the N26. This "brightness" is in the 4khz to 10Khz (above that I can not tell since the sound level meter rolls off too fast). Here is what I got (corrected for meter response) 70Hz -3db 75hz to 4.6Khz +/-2db 4.7Khz +2db 5.5Khz +2db 6.0Khz +4db 6.5Khz +8db **** 7.0Khz +1db 8.0Khz +4db 9.0Khz +6db 9.5Khz +2db 20Khz -3db It seems to me that the N26 should not exhibit sibilance unless it is the source. The N-center may have peaks that can cause or accentuate the sibilance. I put on the CD that gave me sibilance. I ran it in stereo mode (N26's only)and there was sibilance but minimal. I then used a surround mode that used the center channel speaker and the sibilance was much more pronounced and anoying. So It looks like my ears agree with the results above. This also might explain why I seem to hear moderately anoying sibilance while watching TV since I use DPL most of the time and this uses the center channel predominantly (DPL set to normal). Conclusion (from an amateur): N26 has a flat response. The sibilance I hear appears to be from the source primarily. N-center is not equalized as well as it could be the frequencies above the crossover (3.5Khz) need to be attenuated approximately 3-4db across the full range from 4.7Khz to 18Khz Question: Is there an easy way to build a circuit that can eliminate the "brightness" of the N-center that is a constant attenuation from 4.7khz to 18 khz.