advise on cutting bass to 3way 6x9's - 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 26th November 2009, 12:27 AM   #1
diyAudio Member
 
Join Date: Nov 2009
Default advise on cutting bass to 3way 6x9's

hi, im new here. read up a good few threads seems a great place to ask!

i seen an article HERE suggesting using capacitors in parrellel on line goin to back speakers as a kind of crossover to stop them distorting at high volumes, would people here advise this?

Im running an amp powering a sub and two 6x9's on back shelf, its a grand set up but the 6x9's get a bit distorted past half way, could this be a solution? im not very electrically/audio savvy but know the basics, i dont hav a manual for the amp so i dont know what frequencys are cutting off or what the low end capabilities of the 6x9's are.

Please advise
  Reply With Quote
Old 26th November 2009, 01:35 AM   #2
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: Near Vancouver
Certainly you can. It will be a big cap so not cheap unless you opt for an electrolytic. This might not be that bad for a car audio set up. What is the ohm rating of the 6X9 speaker and what is the upper frequency of the subwoofer?

EDIT: Just looked at the link and they seem to be using a polarized cap. I wonder about this as it's an AC circuit. Probably best to use a non-polarized cap.
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  Reply With Quote
Old 26th November 2009, 07:52 AM   #3
diyAudio Member
 
chris661's Avatar
 
Join Date: Feb 2008
Location: Sheffield
Blog Entries: 8
It might be an idea to add an inductor - 6dB/octave won't reduce excursion by much, unless you brought it in at more like 150, 200Hz.

Making it 12dB/octave would mean excursion is reduced a lot more.
__________________
"Throwing parts at a failure is like throwing sponges at a rainstorm." - Enzo
My setup: http://www.diyaudio.com/forums/multi...tang-band.html
  Reply With Quote
Old 27th November 2009, 04:36 PM   #4
sqnut is offline sqnut  India
diyAudio Member
 
Join Date: Nov 2009
why not just disconnect the 6x9's and just add front comps?
  Reply With Quote
Old 28th November 2009, 08:32 PM   #5
diyAudio Member
 
Join Date: Nov 2009
Quote:
Originally Posted by sqnut View Post
why not just disconnect the 6x9's and just add front comps?
front comps? lik run the 6x9's off the HU ?


Quote:
Originally Posted by chris661 View Post
It might be an idea to add an inductor - 6dB/octave won't reduce excursion by much, unless you brought it in at more like 150, 200Hz.

Making it 12dB/octave would mean excursion is reduced a lot more.
im sorry, excursion? im lost, would i add the inducer on line with the 6x9's?

what is the ideal cut off for 6x9's/sub would 150 or 200hz leave too much of a sound gap from the low end of the sub? im not too pushed on SQ once its free from distortion at higher levels.
  Reply With Quote
Old 28th November 2009, 08:59 PM   #6
diyAudio Member
 
chris661's Avatar
 
Join Date: Feb 2008
Location: Sheffield
Blog Entries: 8
Excursion - cone travel. When the speaker passes it's linear excursion rating, you get distortion. Cutting the bass allows the cone to do better on the lower midrange.

This will help you calculate what values to put in.

Passive Crossovers, Capacitor and Coil Calculator

I'd say you could cut it as low as 70-80Hz, but if you wanted pure SPLs, you'll want it higher. (150Hz ish)

Chris
__________________
"Throwing parts at a failure is like throwing sponges at a rainstorm." - Enzo
My setup: http://www.diyaudio.com/forums/multi...tang-band.html
  Reply With Quote
Old 28th November 2009, 10:55 PM   #7
col is offline col  Australia
diyAudio Member
 
col's Avatar
 
Join Date: Feb 2008
Location: Melbourne, Victoria, Australia
Most car 6x9s are 4 ohm. If you have a sub you can probably use a high pass filter at around 200Hz. Use a
200uF 100V Non-Polarised Electrolytic Capacitor in series on the positive lead going to the speaker.

200uF 100V Non-Polarised Electrolytic Capacitor - Jaycar Electronics

col.
__________________
http://www.minirig.org.au
  Reply With Quote
Old 29th November 2009, 03:28 AM   #8
diyAudio Member
 
tsmith1315's Avatar
 
Join Date: Jul 2003
Location: Doerun, GA
Quote:
Originally Posted by dr.Quirky View Post
front comps?
sqnut was suggesting that you do away with the 6x9's altogether and put a nice pair of component speakers (separate midrange & tweeter) up front. A great option for sound quality, but not in the same price bracket as a pair of capacitors.


Quote:
Originally Posted by dr.Quirky View Post
what is the ideal cut off for 6x9's/sub would 150 or 200hz leave too much of a sound gap from the low end of the sub? im not too pushed on SQ once its free from distortion at higher levels.
To answer that, look back at Cal Weldon's post:
Quote:
what is the upper frequency of the subwoofer?
He asked that question to answer your cut off question before it was asked. You must know what the rest of the system is doing in order to integrate as best you can. Had you said the woofers cut off at 80Hz, he would have probably offered a capacitor value that would roll the 6x9's off around 80-100Hz.

A pair of capacitors will provide an estimated cutoff. The actual response will depend on the 6x9's reactance, and that varies from model to model regardless of their rated impedance.

With all that said, for $5 or $10 you can't beat a pair of 200uF or 300uF (NON-Polarized!) caps as a quick fix to help things out. If you want to spend more, you can do even better.
__________________
Tim

Last edited by tsmith1315; 29th November 2009 at 03:32 AM.
  Reply With Quote
Old 29th November 2009, 07:03 AM   #9
mavric is offline mavric  United States
diyAudio Member
 
mavric's Avatar
 
Join Date: Nov 2009
Location: some place nice
Why not use the HPF on the amp? Most have a cut off at 250hz..
What kind of amp? 2 ch 4 ch?
you might need to nothing other than setting your amp up for 2 ch sub/ 2 ch mids high.
What kind of car? Thats why the componts where mentioned, you wand your mids/highs up front, not behind you.
  Reply With Quote
Old 29th November 2009, 05:28 PM   #10
diyAudio Member
 
Join Date: Nov 2009
thanks all for advice , the 6x9s are pionneer 4way coaxial 380w max i dont know what thats rms , it says 80w nominal . the amp has no hbf, its only 2 channel, i have no manual or anything from the amp i ont know what kind of hz range its putting out.

Its a nissan micra im looking into getting front comps once funds become available. thought the caps might be a cheapo solution.

I think im going to go with a pair of 200mf non polarised caps and see how that works. might get a pair of 400~350 ones and try them aswel

Thanks for all advice
  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
3way Horn CLS Multi-Way 4 25th June 2008 01:20 AM
2.5 or 3way deki Multi-Way 13 18th July 2007 02:33 PM
Vifa M18 in 3way? Mos Fetish Multi-Way 42 19th August 2006 05:49 AM
3way as subwoofer? exipnos Subwoofers 8 18th December 2005 06:07 PM


New To Site? Need Help?

All times are GMT. The time now is 11:49 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