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

Multi-Way Conventional loudspeakers with crossovers

Bass directionality etc.
Bass directionality etc.
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
Thread Tools Search this Thread
Old 17th August 2007, 09:35 AM   #1
Kongen is offline Kongen
diyAudio Member
Join Date: Jan 2003
Location: Denmark
Default Bass directionality etc.

Hello, i'm wondering when directionality, phase problems and perhaps other issues arise in a subwoofer - my reason far asking is that i'm considering building a three-way speaker - the mid will start rolling off around 250 hz and was wondering if i could build it as a small sattelite with mid and tweeter, and move the bass into the corner of my room in its own enclosure. To make things clear - i would build two small sattelites and two subs which would probably be placed near the wall behind the sattelites. Probably in a corner or rather close to one.

I'm in doubt when it comes to phase issues - how do these affect the overall sound ? Do they exist at all at frequencies this low ? am i wrong in assuming that the phase issues stop existing at some point - when the wavelength become long enough ? when is this and is this very dependent on the room in which the speakers play.

Directionality is an issue - but again directionality stops being an issue when frequencies get low enough - but how low ? we are still talking stereo-subs so does this make a difference ?

are there any other issues to be aware of ?

thank you...
  Reply With Quote
Old 17th August 2007, 02:02 PM   #2
badman is offline badman  United States
diyAudio Member
badman's Avatar
Join Date: Sep 2003
Location: Sunny Tustin, SoCal
Compare the wavelengths of the frequencies you're concerned with (approx XO frequency +/- 1 octave) and the space you're considering between drivers.

Short answer- for 250Hz XO, keep the sub fairly close to the satellite.
"The dawn of Bose created the "Man Cave" and reduced testoterone levels worldwide by 18.5 per cent" Peteleoni
  Reply With Quote
Old 17th August 2007, 04:24 PM   #3
sreten is offline sreten  United Kingdom
Join Date: Nov 2003
Location: Brighton UK

250 Hz = 1.3m wavelength - not long enough.

  Reply With Quote
Old 17th August 2007, 04:24 PM   #4
zigzagflux is offline zigzagflux  United States
diyAudio Member
zigzagflux's Avatar
Join Date: Oct 2006
Location: Charlotte, NC
Originally posted by badman
Short answer- for 250Hz XO, keep the sub fairly close to the satellite.
I'll second that, based on listening tests. I currently use a set of MTM speakers with stereo 10" woofers in separate boxes. My crossover point is a full octave lower, 126Hz 6 dB on the satellites, and 85Hz 12dB for the woofers.

Satellites are mounted on top of the woofer boxes, with some isolation pads. Height was perfect to bring the tweeters up to ear level.

The higher I went up in frequency on the woofers, the more separation I could hear (a bad thing). At present, it is very difficult to tell I have woofers; it sounds like the bass is coming from the satellites (a good thing, IMO).

As I increased the crossover freq. on both of them with the DCX2496, I could hear more and more that the bass was coming from the floor, not the satellites. Imaging got messed up. My conclusion is that 250 Hz is quite directional. Hearing a bass guitar note coming from two locations just isn't natural.

Oh yeah, I've also tried placing the woofers further back, further apart, etc. While I DO get an increase in bass and greater efficiency, I do NOT get an improved blend between them and the satellites. I guess it's a matter of opinion (as is much in audio).

Good luck. Never hurts to try.
  Reply With Quote


Bass directionality etc.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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Directionality of V-Cap TFTF? Colescuttle Parts 1 17th October 2006 08:15 PM
Resistor testing and directionality Bobken Everything Else 29 18th February 2003 10:42 PM
Resistor Directionality and testing gpapag Everything Else 18 18th February 2003 04:32 PM

New To Site? Need Help?

All times are GMT. The time now is 10:34 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio