Go Back   Home > Forums > Loudspeakers > Full Range

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 10th January 2013, 07:44 PM   #11
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Hi,

Group delay is poorly understood and the subject of much nonsense.
It inevitably increases with good bass extension (at low frequencies).

Your friend is completely wrong IMO, lowering the port tuning is the
answer, it speeds up the bass with a leaner but deeper extension.

Low port tunings with a quasi first order roll-off match most rooms far
better than standard vented and sealed, and go a lot deeper with more
low bass powerhandling than the same sealed, but sealed is an option.

Nothing to do with taste, or opinion, if you haven't tried it.

rgds, sreten.
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
  Reply With Quote
Old 10th January 2013, 08:25 PM   #12
IG81 is offline IG81  Canada
diyAudio Member
 
IG81's Avatar
 
Join Date: Feb 2008
I agree with sreten here. A small box will limit tuning flexibility and probably sound boomier in-room, with less extension ultimately. I've been using a 15" mid-bass in a large-ish, low-tuned box for some months now. There is a ~1st order roll-off under ~100Hz which gradually gets steeper and f3=60Hz and f10=32Hz. Matches my 10'x13' room very well. I might tune somewhat higher if I were using a subwoofer though, but not much. I had 7" isobaric hi-fi towers before that, truly flat to 40Hz and they had somewhat exagerated bass IMO. Sounded "looser" as well.

IG
  Reply With Quote
Old 11th January 2013, 08:00 PM   #13
Sergii is offline Sergii  Ukraine
diyAudio Member
 
Join Date: Oct 2009
Location: Kyiv
Quote:
Originally Posted by sreten View Post
Hi,
Group delay is poorly understood and the subject of much nonsense.
It inevitably increases with good bass extension (at low frequencies).
Your friend is completely wrong IMO, lowering the port tuning is the
answer, it speeds up the bass with a leaner but deeper extension.
Low port tunings with a quasi first order roll-off match most rooms far
better than standard vented and sealed, and go a lot deeper with more
low bass powerhandling than the same sealed, but sealed is an option.
Nothing to do with taste, or opinion, if you haven't tried it.
rgds, sreten.

Two years ago I built the full range Sonido in BR-enclosure with larger volume and deeper tuned port. The sound level presure at LF was not enough that is because the FR of the full ranger was sloped from top to bottom and lower tuned bass enclosure had even less sound pressure at LF.

The sensivity of the a.m. bass driver 12" is a little higher then of the full ranger but I am not sure if it is enogh. That would be also one criterion for choice of the enclosure type and port tuning. I post below data of the both driver. They are two matched pairs but with the fine tuning I can change the sound signature of the speaker.
Attached Files
File Type: doc SFR 175At.doc (62.5 KB, 8 views)
File Type: doc CW300 110602.doc (30.0 KB, 8 views)
  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
Calculating volume enclosure for 2 speakers ribolovec2 Full Range 7 28th December 2009 06:47 PM
Calculating enclosure volume for TL Kensai Full Range 8 15th February 2008 04:49 PM
Calculating For Cabinet Enclosure Space speedemon Multi-Way 24 23rd April 2007 03:47 PM
Calculating EBP for sealed enclosure drivers... sberube Multi-Way 2 4th June 2004 08:14 AM
Calculating volume - bandpass enclosure avatar307 Subwoofers 6 14th December 2003 01:59 AM


New To Site? Need Help?

All times are GMT. The time now is 11:35 PM.


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