Flat Anechoic Measured Frequency Response Speakers

Hesson11,

I use this page. it is a list of all the NRC measured speakers:

http://www.soundstageav.com/speakermeasurements.html

This excess off-axis energy in the lower treble region is caused by the tweeter having a very wide pattern just above the crossover point, and it's there on most speakers

AHA ....now you have hit the nail on the head in respect of the deficiencies of most speaker designs and especially in contrast to the K&H O 500 you refer too, which has the most beautiful plots I think I have ever seen. WOW.

Shadorne, I think I heard that model (or possibly a predecessor) about five years ago at CES. My impression was they would indeed play very loud. They were very detailed, but to my ears they sounded forward and a bit bright. Now they may well have been just a few knob-twiddles away from nirvana, and the waveguides around the mid and tweet do appeal to me intellectually, but going by aural memory I'd prefer any of the big ATCs.

Duke

They were very detailed, but to my ears they sounded forward and a bit bright.

Thanks - although too forward is how many would describe ATC's. The plots indicate these may indeed be a bit brighter in the treble as there is no roll-off at all - beautiful plots on and off axis - apart from a hint of what might be resonance in the metal dome around 16 Khz - I doubt many could hear that but it might add some "glare" - who knows.

Of course as you said with such a perfect response one could simply tone down the treble to get any desired response "nirvana" at all...the key is the balance in on and off axis which remains whatever you do with tone control - beautiful plots!