I am using the SPM's in my system and I have no problem with the bass response. It's there, it's deep, and it's tight. I have not heard the Blue Heavens.
The SPM's are fast, and this 'quickness' could, I suspect, be heard as somewhat 'lean'. In other words, they are not warm sounding. I use them with my Aerial 10T's which fall on the warmer side; they love that purple wire--it's a match made in (not blue)heaven.
Good Luck.
The SPM's are fast, and this 'quickness' could, I suspect, be heard as somewhat 'lean'. In other words, they are not warm sounding. I use them with my Aerial 10T's which fall on the warmer side; they love that purple wire--it's a match made in (not blue)heaven.
Good Luck.