Yamaha NS-6490 Bookshelf Speaker Review. TRANSPARENT. Flawed but still Good. Compared to JBL 530.

[@thomaselliott4562]

These can be modded to vastly improve the sound. I found the tweeter to be too harsh and swapped them out in favor of Tympani soft dome types. I swapped the factory butterfield cross-overs for a pair from Infinity two-way speakers and don't use the midrange drivers except to simply plug the holes. I also converted the cabinet to bass reflex by adding two port tubes to each cabinet front. Very small tubes perhaps a little over one inch. I also added acoustic batting inside to smooth bass and absorb hollow box resonance. A lot of mods but in the end they sound decent and far more enjoyable. A 3-way crossover such as a Infinity Reference 5 could also be used and keep the midrange operating but I think I would in that case add a L-pad on the mid to tone it down. One oddity with these from the factory is the mids are wired reverse polarity.

[@MediaPipeDream]

Huh, that is interesting, will need to check the mid drivers out and fix it. thanks for the tip

[@thomaselliott4562]

Additionally I read somewhere the midrange driver in these is wired reversed-phased compared to the tweeter and woofer. Not at all certain why Yamaha did that.

[@MediaPipeDream]

I read/heard that too. Thanks for sharing!

[@luisfernandozeavelez9204]

Hola gracias por tu análisis y gran apreciación sobre estos parlantes... Me quedé con la conclusión de su transparencia y que si le agregamos un subwoofer mejoramos la escena musical con ayuda de ecualizador..... Los utilizaría para escuchar jazz y música clásica... Gracias 🤟👌👍🎻🎷🎺🪕🎹😮

[@MediaPipeDream]

Me gusta escuchar Jazz tambien y musica clasical. Gracias por los comlimentos de me analisis. Un subwoofer ayuda los sonisdos bajas mucho. Lo siento para mi espanol peor.