Active vrs passive - Page 54 - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 26th October 2012, 03:01 PM   #531
diyAudio Member
 
Join Date: Feb 2009
Location: UK
Quote:
Originally Posted by SY View Post
If there's a difference in the dynamic range/compression of my speakers before and after I went active, I sure couldn't hear it. And when I first got them, I will admit to cranking a few albums into the three figure SPLs...
In my case, I really think I can hear the difference - but it's not a blind test so I can't be sure. To me it manifests itself as a sense of the music pouring in through the open end of the room, compared to before where it was being 'forced' under pressure out of two boxes.
  Reply With Quote
Old 26th October 2012, 03:08 PM   #532
Pano is offline Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: Milliways
Blog Entries: 4
You may well be hearing a real difference, and it may be the different crossovers. But I don't know if it's active vs passive. I have not noticed the effect going from active to passive, but admit I wasn't listening for it.
  Reply With Quote
Old 26th October 2012, 03:11 PM   #533
puppet is offline puppet  United States
diyAudio Member
 
Join Date: Dec 2011
Location: The Dells, WI
I believe that this has to do with where the signal is being processed .. in the low voltage line level stage vs the higher voltage speaker level stage. The position of the amplifier has to have an effect on driver(s) dynamics.

SY said he didn't hear any difference but I don't believe him :P
  Reply With Quote
Old 26th October 2012, 03:12 PM   #534
Pano is offline Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: Milliways
Blog Entries: 4
Quote:
Originally Posted by abraxalito View Post
This effect does though have to be offset against the fact that IMD products outside the driver's passbands will be subject to attenuation in the passive case, not in the active one.
This is an interesting point that I have been thinking about a lot lately. I really don't know how much of an effect it has, or could have. Anyone have any expanded knowledge on this subject?
__________________
Take the Speaker Voltage Test!
  Reply With Quote
Old 26th October 2012, 07:21 PM   #535
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
Quote:
Originally Posted by puppet View Post
SY said he didn't hear any difference but I don't believe him :P
he said no difference regarding dynamic/compression....
not that it didnt sound differnt at all

btw, I wouldn't mind making my speakers active, not at all
actually, I would like to
and I would try my best to make them sound the way they do now

but if I continue my ideas about big tweeter horns and compression drivers, they will surely be active, no doubt about it
and in the end the whole speaker will probably be a mixed active/passive hybrid, and with passive tone controls
  Reply With Quote
Old 26th October 2012, 07:52 PM   #536
diyAudio Member
 
Join Date: Jan 2008
Originally Posted by CopperTop
My perception is that passives begin to sound strained at high volume, while the actives just keep on keeping on.

Quote:
Originally Posted by Pano View Post
How high a volume are we talking about? I can ceratinly understand that in P.A. application - tho Danley's Unity Horns seem to do OK - but in small rooms?
Do you think it's related to the drivers?
Drivers impedance rises when they heat, which changes the frequency response when used with a passive crossover.
High frequency drivers have little voice coil mass, so this effect can happen quite rapidly.

The offset horn used for midrange in Danley's Unity or Synergy horns is an acoustical bandpass, it reduces distortion components whether used active or passive.
  Reply With Quote
Old 26th October 2012, 08:12 PM   #537
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Quote:
Originally Posted by puppet View Post

SY said he didn't hear any difference but I don't believe him :P
You're not that far away, come hear it for yourself.

Passive, the stock speakers could go far louder than I could stand with no sign of compression or strain. That was one big reason that they got rave reviews from a notorious rocker who used to write for Stereophile. Active didn't change that, it just made the bass smoother (through crossover and midbass chamber modifications) and more extended.
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 26th October 2012, 08:23 PM   #538
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
Quote:
Originally Posted by weltersys View Post
Originally Posted by CopperTop
My perception is that passives begin to sound strained at high volume, while the actives just keep on keeping on.


High frequency drivers have little voice coil mass, so this effect can happen quite rapidly.
yes, its true if you play very loud
but coppertop only mentions better bass

a friend have very old Cervin Wega, and they sound very 'effortless'
but only with good and big power amps
the more the merrier it seems
funny tho, I think someone told me there is no xo on woofer
hard to believe
  Reply With Quote
Old 26th October 2012, 08:45 PM   #539
diyAudio Member
 
Join Date: Jan 2008
Quote:
Originally Posted by tinitus View Post
yes, its true if you play very loud

a friend have very old Cervin Wega, and they sound very 'effortless'
but only with good and big power amps
the more the merrier it seems
funny tho, I think someone told me there is no xo on woofer
hard to believe
A lightweight, low sensitivity small dome tweeter can quickly change in impedance at less than 90 dB at one meter, a level I would not consider particularly "loud".

The change in impedance will change the frequency response when using a passive crossover, low sensitivity tweeters without a resistive pad will sound "more different" at high level than a efficient compression driver with a resistive pad that may be reducing the power by 90%.

I recently used parts from a pair of old Cerwin Vega 3 way cabinets, they had no in line components on the woofer.
There are many passive crossover speakers that use no crossovers on the woofers, if the acoustic rolloff is adequate to start with, no need to add a coil, or a coil and a capacitor.

Last edited by weltersys; 26th October 2012 at 08:52 PM.
  Reply With Quote
Old 26th October 2012, 09:39 PM   #540
puppet is offline puppet  United States
diyAudio Member
 
Join Date: Dec 2011
Location: The Dells, WI
Quote:
Originally Posted by SY View Post
You're not that far away, come hear it for yourself.
I grew up in ChiTown ... southsider (around Kelley HS). If I ever make a run for polish sausage and TomTom tamales, maybe we can hook-up :P
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Active or Passive bjackson Multi-Way 30 4th April 2005 10:49 PM
Passive into active MethMan Multi-Way 8 12th January 2005 04:58 PM
Active of passive audiobomber Multi-Way 9 31st July 2004 02:31 AM
dB loss by using passive crossovers? Active vs Passive and 1st vs 4th order Hybrid fourdoor Multi-Way 3 11th July 2004 09:16 PM


New To Site? Need Help?

All times are GMT. The time now is 03:30 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2