I agree Terry in that to achieve the best recording possible you need the flatest frequency reponse Monitors possible. But I think the Yamaha MSP5's fall within that category; ie., "flat frequency response". The nice thing about the MSP5's is there is enough bass response or Low End to give the Artist a true feel for the music and what is actually "present in the sound". If you are not able to get a good picture of what is happening at the bottom end your recordings and masterings will be affected for the worse not the better most likely.

On the High End frequency the truth is most adult humans cannot hear any sound frequency above 10kHz anyway. But it is nice to know the MSP5's range all the way up to 40kHz! (Just in case your dog or cat happen to be in the audience).

I have listened to the BX5's and I concluded they did not have the necessary Bass response LF needed to get a true "sense" of what was going on in the Mix to be able to actuate the Mastering accordingly and appropriately.

Plus when I am just playing my Keyboard or listening to Midi's through the Keyboard etc., it is nice to have that great Bass response I get from my MSP5's. And if you want to rattle a few windows the MSP5's are able to deliver up to 101 dB SPL at one metre on axis unlike the rather paltry 90 dB output of the BX5's. Also have you noticed that Midiman does not reveal the THD=% in the list of the BX5's specs on their web site? Could it be that they would rather a person not know perhaps because it is less than stellar? Just wondering I guess as to why they don't post it.

Best regards,
Mike

PS: I agree also with Terry that a person needs to demo the Monitors in question or any other Monitor for that matter, to determine if they are up to a person's expectations and satisfaction before purchasing it/them.