Does subwoofer + bookshelve=full range speaker?


I am sort of new to this hobby so this may seem like a dumb question.
I always wonder if add a good sub to a bookshelve speaker do you get a same performance as the large full range speaker.ie if you add a subwoofer( assuming a good one) to B&W 805 or Martin logan entry level model . do you get the same performace as N801 or prodigy or more because the subwoofer in many instance will go even deeper than the full range speaker?
if not why not?
a1126lin

Showing 2 responses by audiokinesis

Well said, Karls.

I just happen to sell a sub that may blend even better than the RELs. It's the Tegmentum sub from Buggtussel.

The Tegmentum is a transmission line sub with claimed response to 16 Hz. I can't independently verify that, but it does go very deep and is very quick and tight.

The Tegmentum is designed to come in under the main speakers, like the RELs do. The crossover is continuously variable in frequency from 35 Hz to 400 Hz, and has variable slope and filter Q. In addition, the amplifier/crossover includes a two-band parametric equalizer. This is the most flexible crossover/equalizer/amp I know of, and that flexibility is quite welcome in getting a good blend with a wide variety of main speakers.

I wanted to be a REL dealer until I encountered the Tegmentum.
Karls, Buggtussel will do custom frequency ranges. They're a small company enough that they're quite responsive to individual needs.