3way with bandpass sub - Page 2 - 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 7th August 2007, 03:00 PM   #11
DorinD is offline DorinD  Romania
diyAudio Member
 
DorinD's Avatar
 
Join Date: Jan 2005
Location: Bucharest
Quote:
Originally posted by sreten
... is pretty much an in room boom box in my terms...
I think that is supose to be, a boom box of clean fundamentals. Armonics of these are the job of other drivers.
  Reply With Quote
Old 7th August 2007, 03:20 PM   #12
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
Firstly driver VAS is 225 liter

Second, you got the calculations of the design wrong ... it looks like this

With a Qts=0.19 I can hardly believe it will be a boom box

The software I use tells me that the passband will be 18hz - 50hz

DorinD, I am not sure I understand the meaning of your answer ?
Attached Images
File Type: jpg sub.jpg (13.0 KB, 274 views)
  Reply With Quote
Old 7th August 2007, 06:16 PM   #13
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Quote:
Originally posted by tinitus
Firstly driver VAS is 225 liter

Second, you got the calculations of the design wrong ... it looks like this

With a Qts=0.19 I can hardly believe it will be a boom box

The software I use tells me that the passband will be 18hz - 50hz

DorinD, I am not sure I understand the meaning of your answer ?
Hi, that layout sshould not make any difference, Vas is not wrong, sreten.
Attached Images
File Type: jpg guff.jpg (76.0 KB, 251 views)
  Reply With Quote
Old 7th August 2007, 06:20 PM   #14
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
Looks different to me ... and I dont know why different software say something different

What you say is that low end rolloff is nothing different from ordinary BR ?

  Reply With Quote
Old 7th August 2007, 06:55 PM   #15
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
If thats the case I might as well make it a closed 100liter, and loose 6-12db from 50-20hz, with active filter

Doesnt look so tempting now my midbass with higher Qts might do that better on its own, allthough it does have Fs of 18hz
  Reply With Quote
Old 7th August 2007, 07:13 PM   #16
DorinD is offline DorinD  Romania
diyAudio Member
 
DorinD's Avatar
 
Join Date: Jan 2005
Location: Bucharest
Tinitus,
my observation to Sreten comment just says that a "boom-box" character of a sub-bass is not a bad thing but the norm. A sub-bass channel perform only the lowest fundamentals, so the lack of armonics aleviate any "color" or special tone to the sound. Like an uni-tone or boom-box.

Not the same character could be expected from a closed of BR sub box. These, because of their large bandwidth, can perform a lot of armonics (to some hundreds Hz) from the musical program and their distorsions products. So, their sound is much colored and capture much of the bass instrument's tone.
  Reply With Quote
Old 7th August 2007, 07:40 PM   #17
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
OK, still thinking

Well, we all know that midrange sounds better if the driver is relieved from bass duties
The same thing might apply to a midbass driver relieved from the lowest frequency
  Reply With Quote
Old 7th August 2007, 10:22 PM   #18
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
New problem ... my 12" midbass woofer is too good, and goes too low ... too much overlap with sub

New, wiser, different and smaller design

Still 6th order bandpass sub, but now with 8" ... and now with a 2way top with a 6" and tweeter ... pretty ordinary, allmost ... topic smashed

drivers could be these, and they are all together cheaper than the planned sub driver

http://www.monacor.dk/produkter/hoej...-9/vnr/101810/

http://www.monacor.dk/produkter/hoej...-9/vnr/104250/

Well, I wanted BIG, so this is not gonna be ... maybe some other time


Thanks guys!
  Reply With Quote
Old 7th August 2007, 11:48 PM   #19
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
Before final closing, I would like to ad that this Legend B102 might be nearly perfect fore the big 3way
fore some time I have been thinking of a way to use this driver, and that could even be a 2way with a ribbon like the Hivi RT8II ... and the 6th order passband sub should blend nicely ... and just a simple 2way xo ... and nice efficiency ... maybe in my dreams

http://www.partsexpress.com/pe/pshow...Number=290-495

Cheers
  Reply With Quote
Old 8th August 2007, 01:12 AM   #20
jamikl is offline jamikl  Australia
diyAudio Member
 
Join Date: May 2005
Location: Melbourne
Sorry if I'm thick but there is one thing I don't understand in this thread. Sretens diagram shows the speaker unit coupling into the front chamber and BOTH PORTS coupling to the room. Tinitus' diagram shows the speaker coupling to the front chamber, a port coupling from the rear chamber to the front chamber and only the FRONT CHAMBER PORT coupling to the outside air. This is similar to another speaker discussed somewhere, I don't remember where. that had a variovent between the two chambers.

Is there a difference in the performance of the two speakers laid out as shown?
jamikl
  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
2.5 or 3way deki Multi-Way 13 18th July 2007 03:33 PM
Vifa M18 in 3way? Mos Fetish Multi-Way 42 19th August 2006 06:49 AM
First Build (3way) Baronty Multi-Way 6 14th October 2004 10:20 PM


New To Site? Need Help?

All times are GMT. The time now is 01:07 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