Toyota Aristo sedan, seats that don't fold, 4th order bandpass pics! - diyAudio
Go Back   Home > Forums > General Interest > Car Audio

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 25th August 2011, 11:57 PM   #1
diyAudio Member
 
Join Date: Feb 2008
Default Toyota Aristo sedan, seats that don't fold, 4th order bandpass pics!

attempting to get loud in the Aristo, with seats that don't fold...

plus a very restricted boot opening.

its assembled in the boot in 3 main pieces, that are then held together with 4 more pieces, plus a removable top, and baffle.

the problem is, it all started going downhill once testing began...

with about 70 litres sealed, and 200 litres tuned to 58Hz, I expected a peak around 50Hz....

tones tones tones, sweep, sweep, tone, tones tones.... it peaks at 36Hz.... 142dB at 36Hz.

so I moved the entire baffle up, reducing the ported chamber by a lot, and thereby increasing tuning, right? 130 litres, tuned to 70Hz?!?

tones, sweeps, etc....

141dB at 37Hz... my peak didn't move... wtf man!
Attached Images
File Type: jpg boxed2.jpg (191.0 KB, 24 views)
File Type: jpg boxed4.jpg (225.4 KB, 22 views)
File Type: jpg boxed5.jpg (225.9 KB, 21 views)
File Type: jpg boxed6.jpg (260.6 KB, 21 views)
File Type: jpg boxed7.jpg (226.6 KB, 20 views)
File Type: jpg boxed8.jpg (221.8 KB, 3 views)
File Type: jpg boxed10.jpg (211.1 KB, 5 views)
File Type: jpg boxed11.jpg (262.3 KB, 6 views)
File Type: jpg boxed13.jpg (177.0 KB, 6 views)
  Reply With Quote
Old 26th August 2011, 12:01 AM   #2
diyAudio Member
 
Join Date: Feb 2008
Originally I ran it with the stock rear shelf, so the stock subwoofer grill could go back on...

This was until I discovered that it gained SPL by simply duct taping the port to the shelf.. so I made a new shelf with a round over...

and also, decided to call myself "Team Duct Tape"
Attached Images
File Type: jpg brrpt.jpg (271.4 KB, 6 views)
File Type: jpg doofdoof.jpg (228.2 KB, 4 views)
File Type: jpg port1t.jpg (279.6 KB, 6 views)
File Type: jpg port2i.jpg (255.9 KB, 5 views)
File Type: jpg splz1.jpg (103.8 KB, 4 views)
File Type: jpg splz2.jpg (125.8 KB, 4 views)
File Type: jpg louder.jpg (176.6 KB, 5 views)
File Type: jpg porttape.jpg (124.2 KB, 6 views)
  Reply With Quote
Old 26th August 2011, 12:05 AM   #3
diyAudio Member
 
Join Date: Feb 2008
double layer on the top, and some bolts, trying to reduce the horrible flex the box has! don't know if it'll increase my SPL, doesn't really matter as its intended as a musical box anyway

silly me didn't round the internal end of the port before I assembled the box, and the router doesn't fit inside the box.

so, dremel, flap disc, and an orbital sander, and I ended up with this, not great, but it'll do.

also added some silicone sealant and duct tape alone some joins, and gasket foam along others. Added a second layer to the back of the box as well to reduce flex.
Attached Images
File Type: jpg bolts1n.jpg (211.9 KB, 7 views)
File Type: jpg bolts2.jpg (207.1 KB, 3 views)
File Type: jpg port3b.jpg (232.6 KB, 3 views)
File Type: jpg taped1.jpg (228.1 KB, 3 views)
  Reply With Quote
Old 26th August 2011, 12:06 AM   #4
diyAudio Member
 
Join Date: Feb 2008
few other pics...
Attached Images
File Type: jpg imgp2072g.jpg (45.3 KB, 5 views)
File Type: jpg imgp2073x.jpg (30.6 KB, 5 views)
File Type: jpg imgp2074h.jpg (24.2 KB, 3 views)
File Type: jpg imgp2075i.jpg (30.6 KB, 4 views)
  Reply With Quote
Old 26th August 2011, 12:11 AM   #5
diyAudio Member
 
revboden's Avatar
 
Join Date: Feb 2011
when you moved the baffle up did that increase the sealed volume? That would lower the tuning of the drivers if you did, thus the tuning stayed ~the same
  Reply With Quote
Old 26th August 2011, 12:13 AM   #6
diyAudio Member
 
Join Date: Feb 2008
Quote:
Originally Posted by revboden View Post
when you moved the baffle up did that increase the sealed volume? That would lower the tuning of the drivers if you did, thus the tuning stayed ~the same
it did, but with the 70 litre sealed chamber it has now, the sealed chamber has a resonant frequency of about 65Hz
  Reply With Quote
Old 26th August 2011, 12:28 AM   #7
diyAudio Member
 
revboden's Avatar
 
Join Date: Feb 2011
are you testing with the doors open or closed?
  Reply With Quote
Old 26th August 2011, 12:30 AM   #8
diyAudio Member
 
Join Date: Feb 2008
Quote:
Originally Posted by revboden View Post
are you testing with the doors open or closed?
dB drag rules.

doors closed, measured on the windscreen, engine not running.

two batteries, one in the stock location, one in the rear.
  Reply With Quote
Old 26th August 2011, 12:45 AM   #9
diyAudio Member
 
revboden's Avatar
 
Join Date: Feb 2011
i just ran several simulations, the port length is dominating the volume changes. about 20cm should tune the box to 65Hz. strange though, I've never tried these changes and seen the port hold tuning this way...

could be the resonance frequency of the car air space... i'm baffled

no pun intended

Last edited by revboden; 26th August 2011 at 12:47 AM.
  Reply With Quote
Old 26th August 2011, 01:12 AM   #10
diyAudio Member
 
Join Date: Feb 2008
its fine, I've come to accept that 36Hz is where its at...

plus, the reinforcing, duct tape, and rounded port really did help...

higher.wmv - YouTube
  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
4th Order Bandpass Help berserker Subwoofers 9 19th January 2007 03:56 PM
94 toyota corolla sedan front door speakers kevinireneh Car Audio 3 18th January 2006 03:16 AM
4th order bandpass with PR tade Subwoofers 2 14th November 2005 01:08 PM
4th order bandpass 4 way the phantom Multi-Way 3 27th July 2005 06:28 AM
4th order bandpass troubles halfdome Subwoofers 13 23rd March 2005 08:14 PM


New To Site? Need Help?

All times are GMT. The time now is 07:58 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