Yamaha DTXpress/DTXplorer/DTXtreme

> Steph seems to have a lot of recent research, as well as in-depth
> knowledge, on the subject of sound reinforcement. Maybe she can give
> you a more technical explanation.

Thanks, Stephen:

I used to install car stereos for fun, and because of my deafness, I had to 
resort to better-quality equipment in order for me to enjoy listening to 
music easily.  That meant making sure that I had amps with big enough power 
supplies to handle the load and electronics to control the speaker's 
movements accurately, placement of speakers in the car (wavelength matching 
as much as possible), "stiffening" caps for power level management, and a 
certain number of amp outputs to get a good, even sound across the frequency 
band in the car when it's loud.  This is how I come to know about this.

It's true that a number of small speakers can be used to reproduce lower 
frequencies they were not designed for, but it comes at a cost of being able 
to move that whole wavelength (20 Hz is about 18m long, 40 Hz about 9m long, 
and so on) very far.  Really, it takes a much larger cone to move larger and 
larger wavelengths.  However, the bigger the speaker, the more robust the 
electronics must be to control it accurately.  I've been wondering lately if 
it's possible to demolish a wooden building with a couple of 10-feet diameter 
speakers emitting a 7 Hz signal aimed at it.  It would probably have to be 
powered directly by the city's power grid...

Stephanie with nothing to do (not!  I'm about to practice)