Coated vs uncoated Scanspeak 15W8530? - Page 3 - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 24th September 2006, 12:21 PM   #21
rabbitz is offline rabbitz  Australia
diyAudio Member
rabbitz's Avatar
Join Date: Jul 2003
Location: Newcastle, Australia
Wise and well chosen words.
No longer DIY active
  Reply With Quote
Old 24th September 2006, 12:28 PM   #22
rabbitz is offline rabbitz  Australia
diyAudio Member
rabbitz's Avatar
Join Date: Jul 2003
Location: Newcastle, Australia
alan.... a sneak peak.
Attached Images
File Type: jpg rz ss finished 1.jpg (60.7 KB, 315 views)
No longer DIY active
  Reply With Quote
Old 28th September 2006, 11:37 AM   #23
diyAudio Member
Join Date: Apr 2006
Location: Midlands
Default to salas and rabbitz

Originally posted by salas
Physical distance of sonic emission centres between drivers translates to phase shift. If it is severe, a polarity inversion that restores it, is indeed in a manner of speaking 'real positive'.
Well , it does seem clever -{and I like your choice of final phrase salas !}- as with the polarity reversal in such case we do get addition instead of a notch in that narrow frequency band around the half-wavelength frequency , but for the majority of the bandwidth , both above and below where the phase shift is not so severe -{and in places its fairly low shift}- we have the portion of the signal above the halfwave frequency and the portion of the signal below the halfwave frequency arriving in opposite polarity at the listener's ears , and some of us can hear this polarity effect to a more disturbing degree than others .
Partly I think the audibility of the polarity difference depends on how much signal processing was done to the original program material the listener prefers , and particually if done with any of :- medium or slow attack time Compressors or Limiters ; large amounts of frequency selective equalization ; time/phase altering effects' devices .
Also , whilst flat response at the centre frequency , there will be some ripple both above and below in the nearby bands owing to the specific distance between the centres no longer being very close to a half-wavelength . The amplitude of this ripple will depend on the slope of the filters used for the cross-over .

rabbitz , thanks again for the photo - that is the one I saw in the other thread we conversed in -{"2-way with 8531G Revelator"}- and was refering to here-above .
I would like to try a curved baffle - sides at least - to reduce the diffraction effects' result of crossing the tweeter over fairly low as it will radiate 180 degrees there . I'd like to curve the edges of the top also , but to do both with large radius will be difficult - I'm still thinking about it .

This thread got a long way down the list in only 4 days ! - there is a lot of activity in this forum recently , and its good to see such !!
  Reply With Quote
Old 4th October 2006, 05:05 PM   #24
Salas is offline Salas  Greece
diyAudio Chief Moderator
Salas's Avatar
Join Date: Oct 2002
Location: Athens-Greece
Offcourse you are right about wideband effects, I did not expand the case since we were focusing in the transition band, plus there things are very audible vs lower and higher especially in a two way design. Cheers.
  Reply With Quote


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
Coating coated paper cone Vivek Multi-Way 5 7th September 2008 07:01 PM
Polish / buff phenolic coated plywood? OzMikeH Full Range 7 11th May 2008 07:04 AM
Anybody can share a network for ss 15w8530 + Vifa XT25 ? 100db Multi-Way 4 16th December 2005 11:24 AM

New To Site? Need Help?

All times are GMT. The time now is 01:28 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2