“So my question is, how much and how quickly can the low range be extended? And does doing so compromise the high range? It certainly seems like working on the high range has compromised my low range – Eb2 used to be a pretty reliable note for me and now it’s always a stretch…but could it just be cause I’ve neglected the low range?
As far as I know, expanding the low range is mostly a matter of lowering the larynx and maintaining fold closure, any other tricks you’d suggest to increase the low range?”
IMO, extending lows and highs can be similar and simultaneous. (e.g., think of Tom Jones).
Bass can be increased by extending the vocal tract for greater resonance of low frequncies and reducing amount of sound trapped inside the mouth-throat (enabling more such bass sounds to be released).
Highs volume is increased by sending sounds up through the back of the throat and into the nasal and sinus areas.
Increasing both is by first creating a longer, more spacious vocal tract in uplifting the back of throat (this slightly enlongates the vocal tract, enabling for better low frequency resonance), lowering the larynx (this increases vocal resonance space) and opening the mouth larger (to emit more sounds). Placing the high notes more in the back of the throat in this shape vocal tract shape enables for more high sounds to get to sinus and nasal areas and resonante more.
So, my opinion is to create a singular vocal tract shape that’s right for both highs and lows and work on developing the full effects of this singular shape. This is supported by Alan Greene’s book, the New Voice.