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 December 2011, 04:41 AM   #1
diyAudio Member
 
Join Date: Dec 2010
Default Enclosure options for Focal 6m115

As the title says. I can't link the T/S, because I'm on my phone. I'd like to cross it in the 3.5k-4k Hz range. It will be a two way setup with goldwood piezo tweeter.
  Reply With Quote
Old 9th December 2011, 11:39 AM   #2
diyAudio Member
 
Join Date: Dec 2010
Bump
  Reply With Quote
Old 9th December 2011, 12:39 PM   #3
mdocod is offline mdocod  United States
diyAudio Member
 
Join Date: Dec 2011
Location: Black Forest, CO
Send a message via AIM to mdocod
I suggest against the piezo but understand this is probably for budgeting reasons? Looks like that woofer is priced pretty low so I assume you are aiming for a very budget build.

If you are going to use a piezo, might have a read here: Piezo Tweeter Crossovers | J Risch

Otherwise I seriously suggest trying to use a proper dome, and crossed over lower if at all possible. Off-axis performance on a 6.5" driver that does not have a "phase plug" above ~3K isn't "ideal" IMO. Just find a $5-10 dome and make a simple 1st over crossover for it cheap with crossover components.

As for box design you have a lot of flexibility and it depends on how big you want to go. The woofer characteristics along with the budget nature of the build has standard vented enclosure written all over it IMO.

1 cubic foot with a 4" diameter x 8" long port will result in a tuning frequency of ~55hz, ~1db of gain in the ~70-120hz range and an F3 of ~50hz. This can be done as a relatively largish bookshelf. I would not suggest going smaller than 1ft^3 with this driver as the bottom end will really get lost and the top of the bass range will get boomy.

1.5-2.5ft^3 in a floor standing design would fill out the bottom end very well with this woofer.

1.5ft^3 tuned to ~45hz (again about a 4"D x 8"L port) will give useful extension to ~40hz.

2.25ft^3 tuned to ~41hz (4"D x 6"L port) will give useful extension to ~35hz

I don't suggest going over 2.5ft^3. Things will just get weird.

Click the image to open in full size.

Best of luck,
Eric
  Reply With Quote
Old 9th December 2011, 01:06 PM   #4
diyAudio Member
 
Godzilla's Avatar
 
Join Date: Nov 2005
Location: New York
I've not simmed it but my gut tells me to seal this driver up in a smaller cabinet than 1cf and add a sub later. There's no frequency response chart so i cannot 'see' if a piezo will work well with it. I like piezo's regardless of their price.

Thanks for running the sims Eric!
  Reply With Quote
Old 9th December 2011, 07:51 PM   #5
mdocod is offline mdocod  United States
diyAudio Member
 
Join Date: Dec 2011
Location: Black Forest, CO
Send a message via AIM to mdocod
Hi Godzilla,

If there were definitely going to be a sub then I tend to agree that a small sealed box would make for a nice natural rolloff up high and a more composed sound. Not a bad idea if you don't need any extension from these. Vented is required to get any extension from these though.

Eric
  Reply With Quote
Old 10th December 2011, 04:55 AM   #6
diyAudio Member
 
Join Date: Dec 2010
Thanks for the responses and sim. Yeah, its a budget build...had some extra cash and wanted to build something Would this tweeter be more appropriate for my application? Size is really no problem. If I were to make a tall, floorstanding bass reflex for the focals, would quarterwave theory affect the response dramatically? I remember reading somewhere that with any "long" enclosure that it begins to work more as a quarterwave resonator as opposed to helmholtz resonator, is this true?
I don't plan on running it with a sub, at least not anytime soon.

Last edited by NcHalfrican; 10th December 2011 at 05:07 AM.
  Reply With Quote
Old 10th December 2011, 06:27 PM   #7
mdocod is offline mdocod  United States
diyAudio Member
 
Join Date: Dec 2011
Location: Black Forest, CO
Send a message via AIM to mdocod
That tweeter would be much better IMO. Probably need ~12 ohm in series with it to match the woofer sensitivity. I would be tempted to look for something 8 Ohm with similar sensitivity so that I could minimize the use of resistance to match the drivers but that's more a personal approach thing I imagine.

As far as the box goes... Brace and dampen. My understanding is that when the box has adequate bracing and dampening, the shape is not very important. You'll see speakers made at all price points using all sorts of cabinet shapes.

Eric
  Reply With Quote
Old 23rd May 2012, 09:39 PM   #8
diyAudio Member
 
lawbadman's Avatar
 
Join Date: Mar 2003
Location: St. Catherine, Jamaica
Any updates on this project?
Im thinking of buying 2 pairs of these speakers.
__________________
<a href="http://www.danasoft.com"><img src="http://www.danasoft.com/sig/lawbadman.jpg" border="0"></a><div style="font-family:arial,sans-serif;font-size:11px;"><p>Sign by Danasoft - <a href="http://www.danasoft.com">For Backgrounds and Layouts</a></p></div>
  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
Focal 2-way crossover design options focal7C Multi-Way 4 20th August 2008 02:56 AM
Focal 11&quot; options for Newbie slickdaddy Subwoofers 2 9th March 2007 10:45 AM
small enclosure LT sub options jteef Subwoofers 2 11th December 2005 10:55 PM
t-line enclosure for focal polykevlar ? please!!! scooby1 Multi-Way 2 28th June 2005 06:47 AM
Enclosure and Woofer for Focal TC120k ppmmcc Multi-Way 7 10th February 2004 11:49 AM


New To Site? Need Help?

All times are GMT. The time now is 02:54 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