Need Advice or Options on Inductor coils - 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 17th January 2007, 06:48 AM   #1
diyAudio Member
 
speedemon's Avatar
 
Join Date: Jan 2007
Location: Northern CA
Default Need Advice or Options on Inductor coils

Hello All

Iím new here found this site tonight by surfing the net trying to learn more on inductor coils. I have a friend thatís trying to help me tune my speakers in my home I have built a couple of years ago. Just to give you an idea of what I have which weíre trying to tune is a set of custom built Dynaudio speakers 66Ē weighing close to 500lbs. It has the DíAppolito designed configuration with the two 30W100 woofers, two 17W75LQ mids and the Esotar tweeter set up for bi-wiring, being driven with a Krell KSA300S through a Klyne System 7 preamp which Iím hoping to replace soon with a Krell preamp. Ever since moving into my dedicated room which measures 28íX 16í I have lost some bass from these speakers. What Iím looking for is more gain on the lower end. I have talked to the speaker designer that built this pair which was tuned for my previous home whrer the room was much smaller. He said what he was going to do was to take out my Solen 4mh air core inductor coil and replace it a steel laminate inductor coil with less resistant. I have been out of it for a while and Iím just getting back into the hobby. What brand of coils now these days are the best of the best on the market at a no cost factor that would be low resistant that you may know of that you can recommend. Also has anyone heard of Goertz brand of air core foil inductors? Iím open to suggestions and my main issue is trying to get the lower end back. Any info would be appreciated.

Thanks
  Reply With Quote
Old 17th January 2007, 08:19 AM   #2
Wombat is offline Wombat  Germany
diyAudio Member
 
Wombat's Avatar
 
Join Date: Jul 2002
Location: Germany
One thing that makes me wonder. If you lower the resistance of the coil in front of your bass it will result in a lower frequency adjustment and the presure level will sink not boost.
__________________
If time permits - stuff some parsley in your ears and listen how it grows!
  Reply With Quote
Old 17th January 2007, 11:39 AM   #3
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Martin King (MJK on this forum, probably frostbit in upstate NY and unable to move his fingers about the keyboard) has done a lot of work with MathCAD allowing you to play around with values and derive an optimal box situation. Just using the stock values for one of his sytems we can illustrate the effect of inserting series resistance into the system -- the first chart has zero inserted resistance, the second has 2 ohms :

Click the image to open in full size.

Click the image to open in full size.
  Reply With Quote
Old 17th January 2007, 03:25 PM   #4
diyAudio Member
 
speedemon's Avatar
 
Join Date: Jan 2007
Location: Northern CA
If not going to a lower resistant coil will do the job, t what would you guys recommend to bring the bass levels up with more sound pressure, since this room is twice the length of my old room.
  Reply With Quote
Old 17th January 2007, 05:11 PM   #5
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: Near Vancouver
If it's set up for bi-amping, why not do that? I know it's expensive but the results may surprise you.

I wouldn't renew an air core with an iron core unless it was parallel (bypass). As mentioned, if you reduce the impedance, you are changing the XO frequency. Not a good thing.

EDIT: I reread your post and it says bi-wiring not bi-amping. Sorry for the confusion.
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  Reply With Quote
Old 17th January 2007, 06:49 PM   #6
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Default Re: Need Advice or Options on Inductor coils

Quote:
Originally posted by speedemon
Hello All

Iím new here found this site tonight by surfing the net trying to learn more on inductor coils. I have a friend thatís trying to help me tune my speakers in my home I have built a couple of years ago. Just to give you an idea of what I have which weíre trying to tune is a set of custom built Dynaudio speakers 66Ē weighing close to 500lbs. It has the DíAppolito designed configuration with the two 30W100 woofers, two 17W75LQ mids and the Esotar tweeter set up for bi-wiring, being driven with a Krell KSA300S through a Klyne System 7 preamp which Iím hoping to replace soon with a Krell preamp. Ever since moving into my dedicated room which measures 28íX 16í I have lost some bass from these speakers. What Iím looking for is more gain on the lower end. I have talked to the speaker designer that built this pair which was tuned for my previous home whrer the room was much smaller. He said what he was going to do was to take out my Solen 4mh air core inductor coil and replace it a steel laminate inductor coil with less resistant. I have been out of it for a while and Iím just getting back into the hobby. What brand of coils now these days are the best of the best on the market at a no cost factor that would be low resistant that you may know of that you can recommend. Also has anyone heard of Goertz brand of air core foil inductors? Iím open to suggestions and my main issue is trying to get the lower end back. Any info would be appreciated.

Thanks

Measure it first with an RTA if you can so we can really help you.
  Reply With Quote
Old 20th January 2007, 12:01 AM   #7
infinia is offline infinia  United States
diyAudio Member
 
infinia's Avatar
 
Join Date: May 2005
Location: Californication
Quote:
Originally posted by Cal Weldon
If it's set up for bi-amping, why not do that? I know it's expensive but the results may surprise you.

I wouldn't renew an air core with an iron core unless it was parallel (bypass). As mentioned, if you reduce the impedance, you are changing the XO frequency. Not a good thing.

EDIT: I reread your post and it says bi-wiring not bi-amping. Sorry for the confusion.
First thoughts may be best after all.
Bi amp you can dial in the crossover points and levels to your taste.
Room placement may be best/most overall economical solution.

Lowering bass drivers source resistance may reduce cuttoff frequency and damping in a negative way for maybe 1-2 db crossover loss improvement at best.
__________________
like four million tons of hydrogen exploding on the sun
like the whisper of the termites building castles in the dust
  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
Copper coil inductor vs. round core inductor tomchaoda Pass Labs 7 21st September 2011 04:42 AM
PFC inductor advice Andy F Power Supplies 48 21st January 2009 03:23 AM
Klipsch Promedia's Died - Upgrade Advice - DIY Options? Minimus 7? Logitech? Partsexp Mysticle31 Multi-Way 3 17th August 2008 08:25 PM
Inductor advice MMeche Multi-Way 5 15th February 2008 09:47 PM
Need Advice on Sub Testing Box rig and Options for Rig Oborous Subwoofers 8 29th November 2006 11:14 PM


New To Site? Need Help?

All times are GMT. The time now is 04:35 PM.


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