tuning a box too low? - 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 14th January 2006, 04:48 AM   #1
diyAudio Member
 
Join Date: Dec 2005
Location: tejas
Default tuning a box too low?

i was considering the tangband neo 6.5" subwoofer to go with the mivi b3s project from zaphaudio.com....i found enclosure plans online with the box tuned to 36 Hz

The recommended freq range by the manufacturer is 35 Hz- whatever...point is, the 5.25" tangband neo sub freq range is more like 45 hz-1500 Hz...so my question is, what happens when you tune a sub box lower than the sub is designed to handle? for example, tuning a box to 35 Hz for a sub that the manufacturer suggests to keep between, say 45 Hz and 1500 Hz?
  Reply With Quote
Old 14th January 2006, 10:10 AM   #2
Volenti is offline Volenti  Australia
diyAudio Member
 
Join Date: Aug 2003
Location: Australia
There's nothing really "wrong" with tuning an enclosure below the Fs of the driver, it won't damage the driver (not directly anyway), it'll change the power handling profile, x-max vers frequency ect but that's par for the course.

The manufacturer's min-max frequency response is pretty arbitiary anyway, top end response will be limited by cone weight and voice coil impedance while lower end response can change dramatically with enclosure design and room gain. (I have a 12'' sub with a 42hz Fs in a 2.5m TL that has an in-room response that actually rises to just below 20hz, as an example of how the enclosure and room can affect these things)
  Reply With Quote
Old 14th January 2006, 10:33 AM   #3
Did it Himself
diyAudio Member
 
richie00boy's Avatar
 
Join Date: Nov 2003
Location: Gloucestershire, England, UK
Indeed, the manufacturers response at the low end is pretty much an arbitrary figure for a 'typical' box.
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more.
  Reply With Quote
Old 14th January 2006, 03:46 PM   #4
diyAudio Member
 
Join Date: Dec 2005
Location: tejas
so i guess it would be safe to toy with low tuning ported boxes without damaging the subs....this is what i wanted to hear
  Reply With Quote
Old 14th January 2006, 04:27 PM   #5
diyAudio Member
 
BassAwdyO's Avatar
 
Join Date: Jun 2004
Location: Illinois
Send a message via AIM to BassAwdyO
yeah you can tune a sub as low as you possibly want. When you get to infinite port length it wont exactly be a sealed box, but I bet the SPL measured would be pretty darn close.

Tuning too high for the bandwidth you're playing is what can be a problem. If you tune to 40hz say and give the sub 30hz content in the signal then it can easily cause overexcursion.

Just remember with smaller subs excursion runs out easier because displacment is what really matters.

Look for the vented alignment which offers flattest frequency response. Most transfer function gain for the particular bandwidth, and the highest power handling for the particular bandwidth.
__________________
The golden rule of DIY:
Build nice, or build twice!
  Reply With Quote
Old 14th January 2006, 06:28 PM   #6
diyAudio Member
 
Join Date: Dec 2005
Location: tejas
what is transfer function? why is high power handling needed?

also you said the excursion is important to consider also cuz this is what matters with small subs...how would you take it into account when building a box?
  Reply With Quote
Old 14th January 2006, 07:17 PM   #7
Did it Himself
diyAudio Member
 
richie00boy's Avatar
 
Join Date: Nov 2003
Location: Gloucestershire, England, UK
The box size and hence efficiency will determine thermal power handling, whereas excursion dictates SPL capabilities. Your best bet is to play about with some modelling software such as WinISD Pro and see how everything interacts.
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more.
  Reply With Quote
Old 14th January 2006, 07:18 PM   #8
diyAudio Member
 
Join Date: Dec 2005
Location: tejas
yea i am using winisd beta version...what does pro offer that beta does not?
  Reply With Quote
Old 14th January 2006, 10:44 PM   #9
diyAudio Member
 
Join Date: Jan 2005
Location: Rotterdam, NL
A lot

Wkr Johan
  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
Tuning at or below Fs tech.knockout Multi-Way 23 3rd February 2012 02:06 PM
Tuning a PR? Animalnisse Multi-Way 2 11th December 2006 08:31 PM
Tuning Qes Qts Bl Mms P Zolt Multi-Way 10 21st April 2005 05:24 PM
Sub Box Tuning Fazorcat Subwoofers 6 2nd March 2005 05:30 AM
Sub tuning fortyquid Subwoofers 3 29th September 2003 07:33 PM


New To Site? Need Help?

All times are GMT. The time now is 01:18 AM.


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