One Mid enclosure, several possibilities... - 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 16th May 2005, 01:44 PM   #1
diyAudio Member
 
Join Date: Nov 2002
Location: Lille, France
Default One Mid enclosure, several possibilities...

Hello,
I use a Flexunit 5" as mid from 225Hz to 2200Hz. As I have to rebuild the high/mid enclosure from my 3 way speaker (tweeter change), I am looking for the best type of enclosure to use.
For the moment, there are several possibilities:
-bass reflex because the flexunit is clearly designed for that. Verity Audio do that.
-sealed enclosure with a low Qt (0.5 at least).
-small closed transmission line like Egglestonworks for the Andra
-aperiodic-like as do Amphion for the Xenon and the Krypton.
-...?

As I know what will be the first reply, I think that I have not enough room for an open baffle mid.

All suggestions are welcome.

Christophe
  Reply With Quote
Old 16th May 2005, 02:40 PM   #2
diyAudio Member
 
Nappylady's Avatar
 
Join Date: Feb 2003
Location: Salt Lake City
Send a message via ICQ to Nappylady Send a message via AIM to Nappylady Send a message via MSN to Nappylady Send a message via Yahoo to Nappylady
You say this is a rebuild... what was it before?
  Reply With Quote
Old 16th May 2005, 02:46 PM   #3
AJinFLA is offline AJinFLA  United States
Banned
 
Join Date: Feb 2005
Location: Tampa
Default Cardioid?

Open Baffle, Open Baffle, use an Open Baffle! . Ok just kidding of course. You haven't mentioned what type of bass alignment you plan to use. In the range that you are planning, I can't see any benefit of a reflex or TL other than complexity . For simplicity the sealed would be the way. But then you have the same issues that plague every box speaker ( I won't bother to explain since S Linkwitz's site does). The Amphion approach is interesting in that (I believe) it is some type of attempt at cardioid radiation - which is good IMHO. Which leads me to a 5th possibility: a cardiod. Basically leaving the back of your midbass "box" open.
I believe that Gradient uses this type of approach (or something similar). It again depends on if you are using some form of active DSP type XO. Passive implementation may prove rather complex.
Perhaps you could give more info. The cardiod won't need quite as much rear wall distance as a true OB, but will retain some of the benifits. SL say's as much about Gradients approach.

Cheers

AJ
  Reply With Quote
Old 16th May 2005, 03:01 PM   #4
diyAudio Member
 
Join Date: Aug 2004
Location: Italy
Hi Cristophe,
Why not a "head" of a B&W 801 nautilus?
Yes they cross a bit higher but the concept is the same.
Maybe the 5"Skaaning have a too much big diameter magnet,
so the rear airflow could will be compromised...........
best regards
  Reply With Quote
Old 16th May 2005, 03:01 PM   #5
diyAudio Member
 
Join Date: Nov 2002
Location: Lille, France
It was a 2-way at first (10L vented but now sealed). Now it is the upper part of my 3-way speaker (Esotar+Flex 5"+Volt 2500). I found that the flexunit sound a little dark to my taste by moment.
Last, my speaker are tri-amplified with a Tact system.

Christophe
  Reply With Quote
Old 16th May 2005, 03:26 PM   #6
DeonC is offline DeonC  South Africa
diyAudio Member
 
DeonC's Avatar
 
Join Date: May 2002
Location: Kimberley, South-Africa
Hi Christophe

I would agree with AJ- try to go for a type of open baffle. I say 'type of' because if you damp the rear wave it isn't strictly open-baffle anymore. One way of doing it would be to use an old patent idea I once saw (I can't remember who patented it). Basicaly it calls for staggered damping. IOW, you hang a sheet of damping material behind the driver, then leave a space open as deep as the damping material is thick, then add another piece of damping material, then another space, etc, etc. The patent does indicate that you can make holes in the damping material of a certain patern, but I can remember how. This does make the box design a lot more complicated, but should IMHO yield the best results. If open-baffle seems to much work, my vote goes for aperiodic. IIRC there once was an article that measured rise-time, and it found that aperiodic boxes had the fastest rise-times (if you understand what I am saying). Aperiodic has long been a favorite of mine (ranked just below damped open-baffle) for mids and upper-bass. Hope this helps.

Enjoy,
Deon
__________________
I don't suffer from insanity. I enjoy every minute of it.
Have a look at my favorite thread: Interesting YouTube video clips
  Reply With Quote
Old 16th May 2005, 03:32 PM   #7
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
Simple experiment for aperiodic:

Knock up a box just slightly larger then the diameter of the speaker, and about 1/3rd the length of the lowest frequency it has to produce. Mount the driver in the front, then just stuff the back with as much filling as you can get in, then see if you like the result! If it's nearly right, then play with the amount of stuffing.
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 16th May 2005, 03:33 PM   #8
diyAudio Member
 
Join Date: Nov 2002
Location: Lille, France
I like the idea of the cardioid radiation. I have never been able to find a picture of the head of the Gradient Revolution to find how it is built.
The Amphion seems very interesting and perhaps easier to build. I think that I will give it a try with my speaker this week. The holes on the sides are looking really small. Any idea about their size? For me, 4 or 5mm? Perhaps conical?

Christophe
  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
TI headphone amp with interesting possibilities FastEddy Headphone Systems 53 5th August 2014 07:54 PM
AD 815 as power amp? possibilities? rhythmdiy Chip Amps 8 13th August 2008 07:47 PM
USB DAC possibilities for <$150 Ang Digital Source 19 22nd December 2007 06:52 PM


New To Site? Need Help?

All times are GMT. The time now is 04:41 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