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Frame, Stretch, Soak


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the rah 
Member - Posts: 27
Member spacespace
Joined: May 15, 2006
Location: United States
Posted: August 06, 2006 at 2:51 PM / IP Logged  

dude that looks cool but did you have a hard time stapleing the material

holla ths rah

rah2son
53389 
Member - Posts: 14
Member spacespace
Joined: June 01, 2003
Posted: August 07, 2006 at 7:05 PM / IP Logged  
HamiltonAudio wrote:
53389 wrote:

Hey guys, don't really know if it should be considered a "Port", "Vent", or "A Variation Of A Bandpass". But hope you guys get the idea of how I'm trying to isolate the bass and keep it in the cabin of the vehicle and not in the trunk. It works for me.

Anyways, I didn't start this thread to be a "Port Design Thread", hope the mods don't lock it Frame, Stretch, Soak - Page 4 - Last Post -- posted image.

I started this thread to share with you guys my frameing skills, and how very important it is to spend the time and go over the little details (routing, perfect circle, rabbeted edges), so you will have better results with the finished product. Hope it helped Frame, Stretch, Soak - Page 4 - Last Post -- posted image.

the unfortunate thing is that by design, what you indeed have here is a bandpass enclosure (more specifically a tri-chamber bandbpass).  Drivers in much smaller sealed chambers all firing into a shared vented chamber.  You are not directing anything with that opening - you are providing the bandpass witha  vent.  If you'd like, give me the overall specs on that design and I'll reverse engineer it and SHOW YOU where your response is....

I can practically guarantee this box is a one-note wonder (as in big pressure at one spot and weak as heck everywhere else).  And no, not all SPL designs are one note wonders - they'll be loudest at one frequency, but will be brutally loud everywhere.  If you give me accurate dimensions, I bet i can tell ya exactly what frequency is loudest in that truck  ;)

Not trying to stir the pot for you here bud - but if ur gonna flex ur "routering skills" and show off box designs, you might want to be entirely sure of what you're saying it is  :) :) :)

bmoney

flexing my routering skills... YES, flexing my wood working skills... YES,  sharing useful tips with forum members... YES

how many numerous times have you seen pictures on this forum regarding fiberglass projects that could of turned out alot better if time was spent on the wood work details? to me it just does not look good when you make a subwoofer ring that sticks out at least an inch with jagged edges about to be fleeced. you dont have to recess or flush mount the subs like i do, but at least router the outer edge of the ring so you can attach fleece to it, and not over the entire ring itself, so the woofer has a true and flat surface it can seat itself on.

anyways, i see alot of projects like this and was just hoping to help others on this forum.

as far as enclosure design, i'm not a pro at it, and i was not trying to show it off, i even said i didn't know what type of an enclosure this should be considered. like i said before "it works for me, keeps the bass in the cabin of the vehicle and not in the trunk", the only reason i posted additional pictures of the vehicle was because a forum member did not understand what i was trying to acheive.

Once again, this thread i started was not intended as a "Port Design / Enclosure Design" thread.

I started this thread to share with you how very important it is to spend the time, and go over the little wood work details so you will have better results with YOUR finished product.

Hope this clarifys everything for you BMONEY

HamiltonAudio 
Silver - Posts: 278
Silver spacespace
Joined: October 15, 2003
Posted: August 08, 2006 at 9:12 AM / IP Logged  

the unfortunate thing is no, it didn't clear anything up.  What you've done, clearly by accident, is create a tri-chamber bandpass enclosure and then tell people who asked you that its NOT a bandpass or a vent or anything but instead a way to "isolate the bass into the cabin and not the trunk"  To me, someone offering advice and/or instruction should be AN EXPERT in their field.  Not someone who's built a few glass boxes and isn't sure what the design or outcome actually will be  :-(  There's no better way to shake someones confidence in you than to not know what you've actually built.

PS - there is far more value in correct and intentional box design than there ever will be in the basic ability to use a $30 Jasper Jig and 1/4 spiral upcut bit and frame something to be stretched with fleece.  I'm sure most shop owners would agree  :-)  Thanks for the reply tho (and the offer still stands - gimme the dimensions and I'll show you how to calculate what you have)

bmoney

Velocity Motors 
Moderator - Posts: 12,488
Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Fabrication. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.spacespace
Joined: March 08, 2002
Location: Manitoba, Canada
Posted: August 08, 2006 at 9:36 AM / IP Logged  
53389 wrote:

Once again, this thread i started was not intended as a "Port Design / Enclosure Design" thread.

I started this thread to share with you how very important it is to spend the time, and go over the little wood work details so you will have better results with YOUR finished product.

Even if your intentions were not to start a thread about Port Design / Enclosure Design, the questions raised from your pics that you posted drew member's off the path of where you wanted them to look. I understand where your going with this post and most of the pros here know how important it is with framing and such, but some of the member's want to know more about the enclosure design and how you were involved in the construction of the enclosure. If you describe the construction of the enclosure you can fortify your post by explaining proper framing techniques as you go.
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
HamiltonAudio 
Silver - Posts: 278
Silver spacespace
Joined: October 15, 2003
Posted: August 08, 2006 at 11:50 AM / IP Logged  

yeps - and thats the point.  To me its a little worrisome when an installer shows off great framing techniques, and adds pics of an ill-designed tri-chamber bandpass which he honestly thinks is a sealed box with the "bass isolated in the cabin".  then back that up more by saying is a "pure spl" install and of course its going to sound bad.  You finding a way to make Dub 7's sound bad is testament to how little you understand about box design....

now be honest (seriously).  Have you noticed that with this "bass isolation method" you get some pretty wildly unpredicted results?  Take this as an opportunity to grow as an installer and become a PRO at box design (which, by the way is fundamentally far more valuable in the bay than glass skills are)  Take the time to learn man - don't just deflect the fact that you've build an unintended fart-cannon and then made the mistake of posting pics about it...of course we're gonna ask!!!!

sorry man - misinformation bugs the HELL out of me  :)

bmoney

53389 
Member - Posts: 14
Member spacespace
Joined: June 01, 2003
Posted: August 08, 2006 at 11:35 PM / IP Logged  

HamiltonAudio

alright, i'm ready to learn enclosure design. I don't have the specs on the box i built with the W7's, it was done awhile back.

where can we start?

Velocity Motors 
Moderator - Posts: 12,488
Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Fabrication. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.spacespace
Joined: March 08, 2002
Location: Manitoba, Canada
Posted: August 09, 2006 at 9:44 AM / IP Logged  
53389 wrote:

HamiltonAudio

alright, i'm ready to learn enclosure design. I don't have the specs on the box i built with the W7's, it was done awhile back.

where can we start?

You can start by going to these threads:
What is a proper sub box?
Loudspeaker sensitivity vs efficiency
Guide: Using WinISD
These are sticky posts in the forums that will help you undestand proper sub enclosure fabricating.
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
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