I've always used TP Basslane to narrow bass frequencies, really useful to make sure all of your low end is centered, especially important for things like stereo synth basses. 
 
TP Basslane is the only 32-bit plugin I still use and I've looked for a free 64-bit alternative for so long. Don't know how I overlooked this. Free and simple - http://www.gvst.co.uk/gmonobass.htm

The IK Multimedia CS Quad Image will do that.
Set it to two bands and reduce the width to mono on the low band.
 
Not free but you may already have it.

A1StereoControl !!! FREE !!!
 

Leslie Sanford Bass Tightener: http://www.lesliesanford.com/vst/plugins/
 
I seem to remember suggesting this to you a couple of months ago. http://forum.cakewalk.com/FindPost/3557850
 
I'm sulking because you ignored me. And it was my first ever post on these forums! 
 
 
 

are these plugs for using across individual bass tracks, bass sub-bus, or master bus?

Can't this be done using Cakewalk's Channel Tools?

batsbrew
are these plugs for using across individual bass tracks, bass sub-bus, or master bus?

Either a bass sub or track. Not for master.
 
GClip is also very useful...
 
Regards,
Dan

S.L.I.P.
Can't this be done using Cakewalk's Channel Tools?

Not based on frequency. This acts as a crossover.
 
Dan

Since we all need a good Vu , kanglehm vu mt does it also ... the bassline was indeed exellent !!!

I switch soon to bx control v2 , when it was dead cheap , you also got decoding possibilities and great metereing and a stereo widner also

dcumpian

S.L.I.P.
Can't this be done using Cakewalk's Channel Tools?

Not based on frequency. This acts as a crossover.
 
Dan

Thanks! Appreciate that!