simple slot ported dual 15 - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

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 22nd April 2014, 10:18 PM   #1
sine143 is online now sine143  United States
diyAudio Member
 
Join Date: May 2010
Default simple slot ported dual 15

ANOTHER friend of mine recently asked about building a dual 15 sub similar to the NEXO RS15. (hundreds of miles away....)

thankfully I'd put some work into this already. He didnt want to curve the ports and couldnt go wider than 43, so I was pretty much stuck with a pair of 3" wide ports.

95 liter chambers ( after driver, port, and brace displacement) loading with 15tbw100, OR faital pro 1030 HP. should have more output than its nexo counterpart (15ndl76) although slightly higher port compression due to restricted port area (305cm sq per driver).

Last edited by sine143; 22nd April 2014 at 10:22 PM.
  Reply With Quote
Old 22nd April 2014, 11:40 PM   #2
sine143 is online now sine143  United States
diyAudio Member
 
Join Date: May 2010
I'd say about halfway done
Attached Images
File Type: jpg 1529793_10201181757900662_8571612370710876492_o.jpg (438.2 KB, 61 views)
  Reply With Quote
Old 23rd April 2014, 02:06 AM   #3
DHAA is offline DHAA  United States
diyAudio Member
 
DHAA's Avatar
 
Join Date: Nov 2013
Very nice work, Sine143. You definitely have the Google SketchUP thing down. It looks like you have some solid carpentry skills too.

If you ever want to attempt the curved ports, check out this video for some ideas:

Building the Subwoofers @ Sulamita Part 1 - YouTube

A while back I was researching some more high-tech slot port designs and came across that video. I thought I had also bookmarked some drawings for the Nexo sub but I can't find them right now. If they turn up I will pass them on.
  Reply With Quote
Old 23rd April 2014, 02:17 AM   #4
sine143 is online now sine143  United States
diyAudio Member
 
Join Date: May 2010
I might add that while I did the sketchup/hornresp sim (hadd most of it done already), I *am not* the one building these, my friend is.

check my other thread for CNC bizness, thats how I would do the curved ports (11 pieces stacked).
  Reply With Quote
Old 23rd April 2014, 02:38 AM   #5
diyAudio Member
 
Join Date: Nov 2007
Quote:
Originally Posted by DHAA View Post
Nice video, but a bit of a rookie "mistake" in there, particularly considering that the woofer baffle is recessed. Always cut the holes for the drivers before bonding the baffle that would be holding them to the rest of the box. The day your router slips, or something else turns your hole-cutting into holey hell, you'll understand .
__________________
www.diysubwoofers.org
  Reply With Quote
Old 23rd April 2014, 03:02 AM   #6
sine143 is online now sine143  United States
diyAudio Member
 
Join Date: May 2010
almoooost there on box1
Attached Images
File Type: jpg 1518927_10201182444837835_4734937384777442672_o.jpg (316.2 KB, 80 views)
  Reply With Quote
Old 23rd April 2014, 03:11 AM   #7
diyAudio Member
 
Join Date: Nov 2007
Quote:
Originally Posted by sine143 View Post
almoooost there on box1
I likey.

FWIW, I've had better results combating panel flex by using diagonal cross-braces, rather than ones that are parallel to any of the edges. Not sure about the reason why...
__________________
www.diysubwoofers.org
  Reply With Quote
Old 23rd April 2014, 04:08 AM   #8
sine143 is online now sine143  United States
diyAudio Member
 
Join Date: May 2010
thanks for that tip. This is actually the first BR I've ever designed/had built so... you live and learn haha.

he still needs to add the "Window Pane" bracing to each chamber, which should help stiffen everything up.

he makes me feel bad about the progress on my THs... he did all this work today! grante its all 90 degree cuts.... and I'm still waiting on my drivers....
  Reply With Quote
Old 24th April 2014, 07:50 PM   #9
sine143 is online now sine143  United States
diyAudio Member
 
Join Date: May 2010
He's getting started on the finish work. stilll needs to add those window pane braces inside the boxes.... I gotta rag on him for that
Attached Images
File Type: jpg 10004023_10201191542385268_3128413518747467950_n.jpg (133.4 KB, 75 views)
  Reply With Quote
Old 4th May 2014, 02:58 PM   #10
diyAudio Member
 
Join Date: Feb 2013
Location: Herefordshire
Nice boxes! Also Faital Pro 15HP1030P is the cheaper ceramic version of the 15HP1060P correct? 95 litres is the same as the internal volume of my 3012lf box (although the 204 sq cm of port area on it is probably too low when you feed that driver max power).
I've found those Faitals in simulations to be very similar to the 3012lf in response in a lot of cabs.
(I do mean the 3012lf, the 3015lf needs about twice the box volume, but only half the amp power for the same SPL, until it hits its lower Xmax limit).

So I'm assuming if you're using a ~40Hz tune, you're getting about 130dB output (2pi) with around 80 Volts (parallel woofers)? Or am I jumping the gun?

Now the only other thing I was going to suggest on those boxes was a couple of braces connecting the H to the back of the box in the centre. Using 18mm ply they are probably more than stiff enough, but see my crude paint picture for an example.
Attached Images
File Type: jpg Box brace.jpg (19.2 KB, 29 views)
  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
Dual horned sub cab ported design vs ported? matthias125 Subwoofers 14 23rd October 2012 03:44 PM
50VA Toroidal Transformer Dual Primary 120/120 and Dual Secondary 15/15 KatieandDad Swap Meet 3 11th February 2012 07:26 AM
pictures. 2 08 L5 10s in a slot ported box. bryantramos79 Car Audio 0 6th March 2010 10:37 PM
slot ported wedge enclosure tycs03 Car Audio 6 3rd November 2009 07:44 PM
building a slot ported enclosure bassman80hz Multi-Way 3 26th February 2003 07:59 AM


New To Site? Need Help?

All times are GMT. The time now is 05:30 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