A few questions on a new project, please - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

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 21st August 2006, 03:14 PM   #1
Misa A. is offline Misa A.  Russian Federation
diyAudio Member
 
Join Date: Dec 2003
Location: Moscow
Default A few questions on a new project, please

Hello, gentlemen

Starting a new TMM project I need your advise to help me clarify a few questions:

1. What is from your experience the minimal acceptable distance between a bassreflex speaker with a port placed on the rear side, and the wall behind it? Will 10 cm (4in) distance be too close? If so, how will it affect sound? The room is very small – 4 x 2.5 m.

2. As an alternative, if I place the 2 inch port just next to a tweeter, will it be very bad? The port edges will be rounded by Ѕ”.

3. For the bass/baffle step compensation woofer I am going to use a 5 mH inductor. Is it safe to use an air core inductor in terms of distortion, or you would suggest to go with an air core inductor with its big DC resistance?

Thank you in advance,

Misha


I build speakers for my pleasure which I find in both the process and the result.
This will be my 3rd speaker project, not counting an XLS12/PR subwoofer, and I want it to be good.
  Reply With Quote
Old 21st August 2006, 04:17 PM   #2
diyAudio Member
 
Join Date: May 2006
Привет тезка!

1. On my supervision if distance up to the nearest barrier of port more than its diameter in 2 times that the port will work normally. Other question this interaction of sources of a sound (port or driver) with acoustics of a room - here there can be some problems because of a close arrangement to a wall...

2. Not absolutely clearly. Is available in view of what the port will be on the front panel?

3. Probably it will help (on russian language) http://www.vegalab.ru/forum/showthread.php?t=5775
  Reply With Quote
Old 21st August 2006, 04:25 PM   #3
diyAudio Member
 
Join Date: Mar 2005
Location: Las Vegas NV
Well for your inductor question, It becomes a matter of cost and crossover design. Design the crossover with the inductor's resistance factored and see if its acceptable. The problem is since your woofer needs to be the most sensitive going with an iron core will result in substantial savings and perhaps better results. A well designed iron core performs pretty well aslong as you stay below saturation levels.

But i'm not sure what distortion it introduces it'd be cool to see if there's a resource online that has more information regarding distortion in inductors.
  Reply With Quote
Old 21st August 2006, 08:09 PM   #4
Misa A. is offline Misa A.  Russian Federation
diyAudio Member
 
Join Date: Dec 2003
Location: Moscow
sorry, i've made type errors:

The port edges will be rounded by 1/2"

in 3rd question I asked about Iron core inductor, of course..
  Reply With Quote
Old 21st August 2006, 09:04 PM   #5
Misa A. is offline Misa A.  Russian Federation
diyAudio Member
 
Join Date: Dec 2003
Location: Moscow
Михаил, In my case of 2 inch port the 2x diameter rule works for me.
I will try to find some decent iron core inductors. If I fail, I will buy some Mundorf 1.4 mm wire air cores from Arkada.
Thanks
  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
few questions on my enclosure project frontier Subwoofers 3 2nd May 2008 10:39 PM
New project, some questions wintermute Multi-Way 3 19th December 2004 07:44 PM
ESP Project 85 Questions Pyro Digital Source 1 15th January 2003 08:09 AM
New Ono project - some questions Ed Robinson Pass Labs 2 2nd January 2003 01:25 PM


New To Site? Need Help?

All times are GMT. The time now is 08:37 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