Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Some questions for my first 4 inch
Some questions for my first 4 inch
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 May 2018, 09:56 AM   #21
planet10 is offline planet10  Canada
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Some questions for my first 4 inch
This particular driver has a relatively high Q. It is not suited to a reflex box. It wants to be in an open or infinite baffle ideally. If you want to do a box, it should be as large as you can live with. I’d recommend a minimum of 5 litres. At that volume the Q is ~1 (ie a bit underdamped), with F6 80 Hz, F10 just above 60 Hz.

You could also make it aperiodic which wouldn’t hurt, bringing the box Q down.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 7th May 2018, 10:03 AM   #22
gkh is offline gkh  Austria
diyAudio Member
 
gkh's Avatar
 
Join Date: Sep 2016
Location: Vienna Austria
Unfortunately, I can't delete this oh-so-rotten post with the sim anymore. Could someone please do this for me?
  Reply With Quote
Old 7th May 2018, 01:04 PM   #23
vha is offline vha  Europe
diyAudio Member
 
vha's Avatar
 
Join Date: Sep 2010
Thank you maybe you can help me better:
The internal dimensions of the box I am already preparing are: 31x14x20 cm. The net volume of 8,68 liters. Ca you check if should the diameter of the vent be smaller (2,5cm) and length be about 3 cm?
What would be the frequencies?
What would be the diameter and the length of the port?
  Reply With Quote
Old 7th May 2018, 01:18 PM   #24
gkh is offline gkh  Austria
diyAudio Member
 
gkh's Avatar
 
Join Date: Sep 2016
Location: Vienna Austria
If you mean me - no, I don't help anymore. Sorry.
  Reply With Quote
Old 7th May 2018, 03:14 PM   #25
vha is offline vha  Europe
diyAudio Member
 
vha's Avatar
 
Join Date: Sep 2010
Quote:
Originally Posted by planet10 View Post
This particular driver has a relatively high Q. It is not suited to a reflex box. It wants to be in an open or infinite baffle ideally. If you want to do a box, it should be as large as you can live with. Iíd recommend a minimum of 5 litres. At that volume the Q is ~1 (ie a bit underdamped), with F6 80 Hz, F10 just above 60 Hz.

You could also make it aperiodic which wouldnít hurt, bringing the box Q down.

dave

Yes thank you
I am preparing enclosures of 8.6 liters for one driver.
I have not decided yet if vented or sealed.
I would need to understand for the diameter of the port and the length.
I would prefer a flat line and not peak in low frequencies.
If sealed then would need some damping material but if vented I am not sure..?

I did some testing before ordering the final wood and plywood to hear the sound with 2 larger enclosures. One enclosure with 2 drivers in parallel and one with one driver as on the pictures below. The sound was more bass when vented at the bottom front of the box and with just little dumping material behind the driver.
Attached Images
File Type: jpg 20180412_191411 - Copy.jpg (87.8 KB, 114 views)
File Type: jpg 20180421_201113 - Copy.jpg (111.0 KB, 108 views)
  Reply With Quote
Old 7th May 2018, 06:38 PM   #26
planet10 is offline planet10  Canada
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Some questions for my first 4 inch
Quote:
Originally Posted by vha View Post
The net volume of 8,68 liters. Ca you check if should the diameter of the vent
That is an OK volume. It should not be ported. Leave it sealed.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 8th May 2018, 11:39 AM   #27
vha is offline vha  Europe
diyAudio Member
 
vha's Avatar
 
Join Date: Sep 2010
Yes This was my first idea. Why would you think better keep it sealed?
  Reply With Quote
Old 8th May 2018, 06:17 PM   #28
planet10 is offline planet10  Canada
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Some questions for my first 4 inch
Quote:
Why would you think better keep it sealed?
The free air Qt is already higher than ideal, sealed or aperiodic is indicated, putting it into a BR just makes things worse.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 9th May 2018, 07:53 AM   #29
vha is offline vha  Europe
diyAudio Member
 
vha's Avatar
 
Join Date: Sep 2010
Thank you Dave
  Reply With Quote
Old 18th May 2018, 08:28 AM   #30
vha is offline vha  Europe
diyAudio Member
 
vha's Avatar
 
Join Date: Sep 2010
What if I put 3 of those Faital pro 4FE35 in a 20 liters box?
  Reply With Quote

Reply


Some questions for my first 4 inchHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
18 inch BR questions and driver preferences. treukauf Subwoofers 32 2nd September 2016 05:19 PM
2 inch Peerless vs 2 inch HiVi Research richie00boy Multi-Way 18 5th December 2007 07:31 PM
Passive Radiator system with 2x10 inch and 1x15 inch Lach O'Sullivan Multi-Way 3 13th September 2003 03:29 PM


New To Site? Need Help?

All times are GMT. The time now is 04:38 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki