Grados have always been characterized as having fast, impacting bass. From the RS-2 on down, that characteristic sticks. The only Grado I've heard that actually executed deep bass while maintaining enough speed to delineate bass notes is the RS-1.
The 590s have the characteristic "slow", heavy bass response that Sennheisers seem to all have. What is being called "more" bass in the quantitative sense is simply more bass heft and weight, something that most Grados don't have due to their quickness. On the flip side, Grados may be better at delineating bass notes due to their quickness, but lack on bass extension and weight. As a result, sometimes drum hits that should have weight and extension (like those large Japanese drums) aren't given due credit by Grados.
I personally think all Sennheisers have too much bass quantity and I don't enjoy them for long periods of time, but that's just me. One thing I severely dig about the Stax Omega IIs is that they can simultaneously execute insanely deep bass and also whack out each bass note with incredible speed and seperation. And yet because of the lack of visceral bass, I am never exausted by the deep bass notes that get pounded out. Awesome combination.
The 590s have the characteristic "slow", heavy bass response that Sennheisers seem to all have. What is being called "more" bass in the quantitative sense is simply more bass heft and weight, something that most Grados don't have due to their quickness. On the flip side, Grados may be better at delineating bass notes due to their quickness, but lack on bass extension and weight. As a result, sometimes drum hits that should have weight and extension (like those large Japanese drums) aren't given due credit by Grados.
I personally think all Sennheisers have too much bass quantity and I don't enjoy them for long periods of time, but that's just me. One thing I severely dig about the Stax Omega IIs is that they can simultaneously execute insanely deep bass and also whack out each bass note with incredible speed and seperation. And yet because of the lack of visceral bass, I am never exausted by the deep bass notes that get pounded out. Awesome combination.