Soffit mounted 15" Tannoy Dual concentric project - Page 6 - 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 11th December 2012, 06:15 PM   #51
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
Originally Posted by Charles Darwin View Post
I assume that the 'VERY ugly alignment' you refer to is the bass shelf.
Yes. I find it to be an unworthwhile exchange of quality for quantity. Any bass reflex i do has at most 1 crossing of zero of the 1st derivative of the simulated LF response.

If you miss bass, add a helper woofer, or time for a horn or TL.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 11th December 2012, 06:35 PM   #52
diyAudio Member
 
Join Date: Nov 2009
Location: Birmingham, UK
I don't miss bass from my Tannoys, I've got a 12" Volt radial in a t/l for that. Well I have two of those actually.

On the other hand if I were to run 15" Tannoys on their own I would not mind giving up a bit of quantity for extension. Never had an issue with the quality of the bass thus provided and you do get some level back from room gain. Just never put Tannoys free into the room but then again that is quite hard to do given the average room size and 300L cabs.

"Any bass reflex i do has at most 1 crossing of zero of the 1st derivative of the simulated LF response." I have no idea what you mean by this. Care to explain?
  Reply With Quote
Old 11th December 2012, 06:39 PM   #53
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
Originally Posted by Charles Darwin View Post
"Any bass reflex i do has at most 1 crossing of zero of the 1st derivative of the simulated LF response." I have no idea what you mean by this. Care to explain?
A zero crossong of the 1st derivative occurs whenever the FR changes from going up to going down or visa-versa.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 11th December 2012, 09:30 PM   #54
diyAudio Member
 
Join Date: Nov 2009
Location: Birmingham, UK
The trick is then to tune the box in such a way that the bass goes down,nearly levels out and goes down again steeper as all you need to do is avoid the bass going up at any point.
Which is basically the response the online calculator predicted for a 130L cab: A gradual fade of 3dB between 120Hz and 42Hz followed by a sharp continuous drop typical for ported cabs. At no point does the response rise, just the rate of drop varies.

One could of course tune them in a way that a response hump appears but that does make the bass sound bloated and 'one-noty' to my ears.
  Reply With Quote
Old 11th December 2012, 10:44 PM   #55
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
Originally Posted by Charles Darwin View Post
One could of course tune them in a way that a response hump appears but that does make the bass sound bloated and 'one-noty' to my ears.
Not if you use high aspect ratio, high resistance vents to knock the hump down, leaving you with a box that is not nearly so sensitive to the dynamic changes in T/S parameters (and the subsequent dynamic changes in alignment.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 12th December 2012, 02:35 AM   #56
diyAudio Member
 
Actualsizeaudio's Avatar
 
Join Date: Jul 2012
Quote:
Originally Posted by planet10 View Post
Not if you use high aspect ratio, high resistance vents to knock the hump down, leaving you with a box that is not nearly so sensitive to the dynamic changes in T/S parameters (and the subsequent dynamic changes in alignment.

dave
Is that similar to the concept behind PMC monitors?

The ATL? (Advance Transmission Line Speakers) from PMC® - YouTube
  Reply With Quote
Old 12th December 2012, 03:15 AM   #57
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Sorta semi-similar goals. The PMC looks more to be development on Fried Q/R or the PEARL PR2. I've done that before (borrowing from both those guys). Their advanced is marketing speak for stuff done 35 years ago and originally going back to Onley in 1938 (ish).

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 12th December 2012, 03:20 AM   #58
diyAudio Member
 
Actualsizeaudio's Avatar
 
Join Date: Jul 2012
Quote:
Originally Posted by planet10 View Post
Their advanced is marketing speak for stuff done 35 years ago and originally going back to Onley in 1938 (ish).
with newer foam
  Reply With Quote
Old 12th December 2012, 09:04 AM   #59
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally Posted by Charles Darwin View Post
.................One could of course tune them in a way that a response hump appears but that does make the bass sound bloated and 'one-noty' to my ears.
I think this applies to all boxed speakers, not just a big Tannoy. An much worse for a high Qts driver than for a low Qts driver.

It is a "trick" used by speaker manufacturers to kid on the listening public that their speaker has more bass than the competition.

Makes for horrible voice reproduction.
__________________
regards Andrew T.
  Reply With Quote
Old 12th December 2012, 11:26 AM   #60
diyAudio Member
 
Actualsizeaudio's Avatar
 
Join Date: Jul 2012
Quote:
Originally Posted by AndrewT View Post
I think this applies to all boxed speakers, not just a big Tannoy. An much worse for a high Qts driver than for a low Qts driver.

It is a "trick" used by speaker manufacturers to kid on the listening public that their speaker has more bass than the competition.
I've noticed this as well. It's one of the reasons I've preferred sealed designs I think. People complain about the relatively low output from sealed designs like my O300s (which I find ludicrous). I even suspect listeners are becoming accustomed to it, and miss it when it's not there. Drives me bonkers.
  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
Tannoy SandringhamClone -- 8" Dual Concentric MLTL gripracer Multi-Way 13 4th September 2012 10:05 PM
Tannoy HPD Dual Concentric 15inch JRKO Swap Meet 6 22nd December 2007 02:18 PM
Tannoy 15" Dual Concentric - FS in NZ poynton Swap Meet 6 3rd June 2007 12:49 AM
Tannoy Dual Concentric Driver Unit PTSOUNDLAB Multi-Way 4 13th March 2004 08:31 PM


New To Site? Need Help?

All times are GMT. The time now is 05:19 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