woofer choice - Page 3 - 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 24th February 2009, 05:11 PM   #21
diyAudio Member
 
Join Date: Aug 2008
Default speakers in parallel and load resistors

as you stated earlier that putting the drivers in parallel would drasticly lower the impedance to the amplifier thus be harmful to to the amplifier, so I need to raise the resistance to stablize the amplifier. Speakers in series the impedance of one affects the other since it will vary voltage between the two, where as using them in parallel will divide the voltage equally, therefore uniform response between the two. Since I have to use the best linear spread of FR matched the best linear spread of linear impedance with the lower impedance being 4 + 4 for amplifier impedance + 4 to stretch FR Range in the lower range divided 2 + .8 for capacitance adjustment

My speaker are mounted on the wall and the room is more wide then long so I wanted a cone drive to help with dispersion and I do not listen to music very loud and I will be time phase aligning the bose at the crossover frequency and the brightness will be ajsuted
the notch filter is for the vifa that I will flatten out a little
  Reply With Quote
Old 24th February 2009, 06:22 PM   #22
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Default Re: speakers in parallel and load resistors

Quote:
Originally posted by mcmahon48
as you stated earlier that putting the drivers in parallel would drasticly lower the impedance to the amplifier thus be harmful to to the amplifier, so I need to raise the resistance to stablize the amplifier. Speakers in series the impedance of one affects the other since it will vary voltage between the two, where as using them in parallel will divide the voltage equally, therefore uniform response between the two. Since I have to use the best linear spread of FR matched the best linear spread of linear impedance with the lower impedance being 4 + 4 for amplifier impedance + 4 to stretch FR Range in the lower range divided 2 + .8 for capacitance adjustment

My speaker are mounted on the wall and the room is more wide then long so I wanted a cone drive to help with dispersion and I do not listen to music very loud and I will be time phase aligning the bose at the crossover frequency and the brightness will be ajsuted
the notch filter is for the vifa that I will flatten out a little

Hi,

I have no idea what you are talking about ....
Please post your crossover.

/sreten.
  Reply With Quote
Old 24th February 2009, 08:56 PM   #23
diyAudio Member
 
Join Date: Aug 2008
Default send me your email or

go by this discription
positive bass lead load resistor to LP coil to capacitor in parallel
.72 mH coil 3.3 capacitor
figuring around 3.9 load resistor will determine correct value from final testing
tweeters .08 mH in parallel for for 12 or 15 k 1.73 C is added to branched off from the lower end tweeter that has 5.3 C so the two will be in series
tweeter 3Khz to 12 or 15 Khz .35 mH plus the .08 mH and a 5.3 capacitor in series before the inductor coils
additonal resistance will be add to parallel paths for stablizing and voltage push back
  Reply With Quote
Old 25th February 2009, 02:49 AM   #24
gorbs is offline gorbs  United States
diyAudio Member
 
Join Date: Feb 2009
what alien language are you guys bantering back and forth lol. i just want to make a nice looking and sounding set of speakers. now it seems it is an almost impossible task unless i can learn to decipher this cryptic language of yours. back to the books i guess ggrrrrr.! i knew i should have started younger
  Reply With Quote
Old 25th February 2009, 03:20 AM   #25
diyAudio Member
 
Join Date: Aug 2008
Default cant you read the other posts?

They were inquiring about the speakers I am building and since I am using silverflutes speakers which was talked about earlier and they are interested in my speaker design and not yours on some of these responses. We will at time switch topics. To fill you in on the so call foreign language you should look up crossover designing and electronic terminology
understand what a Butterworth LR Bessel first order second order 3 order 4 order and find a page with audio electrical glossary
speaker building is not as easy people think you just dont put a bunch of speakers in a box and wire them together most of the cost in speaker designing is in time and experimentation and correcting thing you do something incorrect you will either blow or burn your speaker or burn out your amp
  Reply With Quote
Old 25th February 2009, 03:24 AM   #26
diyAudio Member
 
Join Date: Nov 2007
Hi mcmahon,

I hope you dont mind if I describe the xo here to make it clearer to understand by others.

The bass section of he xo consist of 2nd order L-C network, But with a resistor before that, To raise the impedance due to the very low impedance posed by the 2 paralleled 4ohms woofer, as supposed by mcmahon. Which is the wrong way to do it if you ask me.
  Reply With Quote
Old 25th February 2009, 03:30 AM   #27
diyAudio Member
 
Join Date: Aug 2008
go by this discription
positive bass lead load resistor to LP(low Pass Filter) coil to capacitor in parallel
(.72 mH coil value) 3.3 capacitor
figuring around 3.9 load resistor( a resistor that is put in to increase the impedance to the circuit so it will be in the safe rage of the amplifier) will determine correct value from final testing
tweeters .08 mH in parallel for for 12 or 15 k ( frequency crossover at 120001 or at 15000).73 C (capacitance value)is added to branched off from the lower end tweeter that has 5.3 C so the two will be in series
tweeter 3Khz to 12 or 15 Khz Frequency range of 1 tweeter will be from 3000 hz to either 120000 or 15000hz) .35 mH plus the .08 mH and a 5.3 capacitor in series before the inductor coils
additonal resistance will be add to parallel paths for stablizing and voltage push back( a resistor that stablizes and also redirects part of the voltage and current to the speaker to keep volume up
  Reply With Quote
Old 25th February 2009, 05:04 AM   #28
diyAudio Member
 
Join Date: Aug 2008
Default crossover

here is my upload
Attached Images
File Type: jpg 2009_0222speakers00302.jpg (70.9 KB, 168 views)
  Reply With Quote
Old 25th February 2009, 05:46 AM   #29
diyAudio Member
 
Join Date: Aug 2008
Wink updated crossover design

here it is
Attached Images
File Type: jpg 2009_0223xover0001.jpg (84.2 KB, 165 views)
  Reply With Quote
Old 25th February 2009, 06:13 AM   #30
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
May I ask, how have you come to this xo ?
__________________
sometimes we know very little, and sometimes we know too much
  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
Lousy woofer choice? help! 14G-Dutch^ Multi-Way 17 4th August 2010 09:25 AM
Woofer choice for small cab PeteMcK Multi-Way 8 12th June 2009 04:48 AM
10" woofer choice Sypher Multi-Way 48 10th January 2008 05:38 PM
your choice of amp for 2 woofer 15in ostie01 Solid State 9 1st August 2006 12:54 PM
Mid-Woofer choice Audist Multi-Way 0 9th January 2005 10:49 PM


New To Site? Need Help?

All times are GMT. The time now is 03:11 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