I bought it, turned it on through a vintage Yamaha Natural Sound AX - 500 - the sound is quite decent, there is enough power, like nothing, I even liked it on The Wall - Pink Floyd compact. But, as stands for them, there were Soviet broadbands - Hong Kong 10AS on 10GDSH 36 - 79th year, with restored suspensions. Included for comparison in the same amplifier, the second pair. A surprise awaited me, ten-watt models with a band of 53 - 18000, in terms of sound quality both in lows and highs, beat the NS-6490 by a decent margin. Included in parallel sound great, complementing each other, the total resistance is really low, the output can be burned. As a result - for their price, quite tolerable speakers, but lost to the Scoops, a class lower and to the Chinese computer - Edifaer R1850DB.
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