Previous Thread
Next Thread
Print Thread
Rate Thread
What makes a sub , a "digital" sub , ref:EP500
#63194 10/03/04 11:34 PM
Joined: Oct 2004
Posts: 3
J
jedi52 Offline OP
newbie
OP Offline
newbie
J
Joined: Oct 2004
Posts: 3
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

Re: What makes a sub , a "digital" sub , ref:EP500
#63195 10/03/04 11:57 PM
Joined: Jun 2003
Posts: 6,833
W
Wid Offline
axiomite
Offline
axiomite
W
Joined: Jun 2003
Posts: 6,833
Here is a link to the latest Axiom newsletter about the new line of subs.Hope this helps.


Rick


"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud

Re: What makes a sub , a "digital" sub , ref:EP500
#63196 10/04/04 01:01 AM
Joined: Oct 2004
Posts: 3
J
jedi52 Offline OP
newbie
OP Offline
newbie
J
Joined: Oct 2004
Posts: 3
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

Re: What makes a sub , a "digital" sub , ref:EP500
#63197 10/04/04 01:09 AM
Joined: Dec 2003
Posts: 6,331
axiomite
Offline
axiomite
Joined: Dec 2003
Posts: 6,331
This might help also. (Might not.)


Jack

"People generally quarrel because they cannot argue." - G. K. Chesterton
Re: What makes a sub , a "digital" sub , ref:EP500
#63198 10/04/04 01:30 AM
Joined: Aug 2004
Posts: 6,379
Likes: 7
axiomite
Offline
axiomite
Joined: Aug 2004
Posts: 6,379
Likes: 7
>>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


M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8
Re: What makes a sub , a "digital" sub , ref:EP500
#63199 10/05/04 10:26 PM
Joined: Oct 2004
Posts: 3
J
jedi52 Offline OP
newbie
OP Offline
newbie
J
Joined: Oct 2004
Posts: 3
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


Moderated by  alan, Amie, Andrew, axiomadmin, Brent, Debbie, Ian, Jc 

Link Copied to Clipboard

Need Help Graphic

Forum Statistics
Forums16
Topics24,940
Posts442,457
Members15,616
Most Online2,082
Jan 22nd, 2020
Top Posters
Ken.C 18,044
pmbuko 16,441
SirQuack 13,840
CV 12,077
MarkSJohnson 11,458
Who's Online Now
0 members (), 386 guests, and 4 robots.
Key: Admin, Global Mod, Mod
Newsletter Signup
Powered by UBB.threads™ PHP Forum Software 7.7.4