Is there a difference between the 189mx64, the 189 mx150, and the 189 mx300 aside from power requirements? They should sound the same right?
Concur with @ian91 as this new series (line) is being approached a little differently... instead of applying a general FR to all the drivers in the series each impedance driver is specially tuned with their own unique FR that generally falls into the same tight hemisphere for the entire series. In the past the varying impedance drivers of a series (e.g. Blur 266 MX aPs Retune) were literally falling to the left or right of one another on the warm - bright axis.It will probably be best reaching out to Blur for this information. I have the 189 Hybrid MX150 aPs on the way that has a different FR curve to the 189 Hybrid MX64 aPs. The 189 Hybrid MX300 aPs is still in development as far as I'm aware.
I have yet to pin down a general rule for changes heard with higher impedance drivers.
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