Dunlavy SC-IV bass problem

Don't change woofers unless you are prepared to redesign the crossover.

If you really want more bass, I suggest having the woofers' T/S parameters measured to see if it's feasible to port the cabinets. Otherwise, woofers that give you "more bass" in a sealed box will also be lower in efficiency, necessitating a significant crossover modification to restore correct balance between the woofer and the other drivers.

The easier solution is... get a sub and use it to gently augment the low bass region.

Duke
dealer/manufacturer

It is "missing some range".

what amp? Might be the your using is to low in power and the bass is suffering. Tell us what amp your using? And a high power SS amp could be all you need to fire them bass drivers up.

Quality over quantity? Less distortion?

Was it Stereophile that classified it as "limited"? Then again, John Dunlavy pretty much said the same about Stereophile.

Be sure and check the phase as Brf said. I once heard a very large pair of speakers at a friends house, I told him they didn't have much bass, he said nonsense. A couple of months later he found that the factory had wired the woofers out of phase.