The structure/balance of the Heils are the same at low volume as at high volume.The Syrinx will be shockingly cheap for what it delivers...Quad like highs. Limitation is that the sound will break up when over pushed like above 95+db...but that is comfortably above your max max listening level. at 60 db and 90db it will sound essentially identical. The Heil driver is magnificent and the dipole configuration is great. only position requirement is to have at least a foot clearance to the nearest side walls. They are fairly light and easily moved back and forth anyway. 91db/6 ohms, so easy to drive... If you are not a price tag snob, you may have found your nirvana here. Its so cheap, its worth a try and you cant really lose....I’m totally ignorant about technical aspects but heard several apparently expert audiophiles with technical knowledge that high efficiency is not the solution but tone control. Obviously I should try to find out.
Last point I forgot to mention is the speed of the AMT driver, which shows up in piano playback, especially. Air output is 5x the speed of intake and so is really an air velocity transformer. Probably only ion tweeters can compare to speed transients in this regard.
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