Hi Folks,
Just wondering what makes a digital sub ?
I was looking at the EP500 and there does`nt seem to be any control of driver movment (ie: servo , or accellerometer circuit).
Also , are these sub`s "protected" in anyway ( breaker or fuse) ?
Thanks for you help
Gary

Here is a link to the latest Axiom newsletter about the new line of subs.Hope this helps.

Hi Rick,
Thanks for the link !!
I lot of info , but is it there new style amp that controls the excurtion (spl?) of the driver ?
In other words , what is going to keep it from "booming" or bottoming out and tripping whatever protection they use ( if any) ?
Thanks !!
Gary

This might help also. (Might not.)

>>In other words , what is going to keep it from "booming" or bottoming out and tripping whatever protection they use ( if any) ?

Sounds like the idea is that all the audio signals go through a DSP (Digital Signal Processor) which performs the expected equalization duties, but also acts as a "smart protection circuit". Simple protection circuits (fuses, breakers, crowbars etc...) can only look at one or two attributes of the signal -- instantaneous voltage and/or current -- so you can't be real discriminating.

Doing the "protection" in the DSP is pretty clever -- the DSP can look at more things, like signal frequency (cone excursion depends on frequency, not just signal strength) and the amount of time ths signal has been "too loud" -- and can gently crank down the volume until the abuse ends rather than tripping a protection circuit and shutting everything down.

I'm just guessing at what the DSP really does based on the information that Axiom and Soundstage have provided, but you get the idea. Using a programmable DSP lets you make better decisions about what is "too loud" and gives you a bunch of different ways to react, eg. turning down the volume, playing with the EQ to take down one particular frequency, etc...

If you know roughly how the driver cone moves at different frequencies and signal strengths the DSP can make a pretty good guess at excursion even without any kind of servo feedback.

Hope this helps...

JB

Thanks for all your help !!
I think I`m finaly understanding things a little better
DSP , will improve reasponce and sound , but realy isn`t going to limit driver movment.
I`ll get it one of these days !! ( I hope ~~LOL)
Thanks ,
Gary