there's not a lack of bass, of course comparing them withe 150 or 200 watts power it's obvious that one will experience a bigger sound.
I have the edirol as a small monitor and the absolute zero as the bigger one. They both are nearfield monitors.
Over a large period of time I've worked with NS 10- Genelecs- jbl-Monitor one alesis-Tannoy's-thruth 2031and-a few others more.
So, cheap ones and expensive ones, all in different studio's.
In my experience they all sound different. But one can make a good sounding mix on edirol as on mackie or anything else.
Speakers is one thing the sound of your sound enviremont is another.
Are you certain that you hear the speakers and not the walls in your room?
No matter what gear you have, whitout bass traps in your room you won't get a mix right even on expensive speakers.
The edirol's start from 45hz on 10 or 20 watts.
Of course edirol is not top but very useful, if you can mix on those it's a piece of cake on others.
Do some research on bass traps and try out edirol.
Some people won't agree well they have rights too.
If you need aditionel info don't hesitate.
regards chris pax