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

Improving a set of speakers
Improving a set of speakers
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 22nd January 2007, 06:02 PM   #1
Code is offline Code  United Kingdom
diyAudio Member
 
Join Date: Jan 2006
Location: leeds, uk
Default Improving a set of speakers

I have searched with no success so;

Is there a way to calculate ideal T/S parameters from a specified box size?

I'm hoping i can replace my drivers, tweeter, crossover with a more up to date solution (the speakers are at least 20 years old).
  Reply With Quote
Old 22nd January 2007, 06:14 PM   #2
Glowbug is offline Glowbug  United States
diyAudio Member
 
Glowbug's Avatar
 
Join Date: Feb 2006
Location: Hillsborough, NC
I'd tackle it the other way, looking at speakers' recommended enclosure sizes and going from there. BassBox6 Pro and WinISD could be useful...

Why not just build new enclosures that are perfectly suited to your new drivers? I'm sure you can find some help here...after all, this *is* DIYaudio!
__________________
Jim
The machine does not isolate us from the great problems of nature but plunges us more deeply into them. - Antoine de Saint-Exupéry
  Reply With Quote
Old 22nd January 2007, 06:19 PM   #3
Code is offline Code  United Kingdom
diyAudio Member
 
Join Date: Jan 2006
Location: leeds, uk
Hmm, your approach seems rather time consuming, I will continue my search for the original driver specifications.

I would make new enclosures but my woodworking skills are particularly lacking.

Besides these seem to be high quality boxes and i think they look great
  Reply With Quote
Old 22nd January 2007, 06:57 PM   #4
Andy G is offline Andy G  Australia
diyAudio Member
 
Andy G's Avatar
 
Join Date: Apr 2002
Location: Newcastle, Australia
perhaps if you post the box volume and the port size, someone may have built a box of similar dimensions, and can point you to possible drivers.

also, what size holes you have already etc
  Reply With Quote
Old 22nd January 2007, 07:07 PM   #5
Code is offline Code  United Kingdom
diyAudio Member
 
Join Date: Jan 2006
Location: leeds, uk
Worth a shot

External dimensions:

Width: 27cm

Height:57.5cm

Depth:29cm

Side thickness: 112mm

Port length:14cm

Port width:2inches

Mid/bass: 8 inch tpx, made by Audax i believe.

Tweater: 3.5cm metal dome. "monitor audio" is written on the rectangular face plate.
  Reply With Quote
Old 22nd January 2007, 07:47 PM   #6
Code is offline Code  United Kingdom
diyAudio Member
 
Join Date: Jan 2006
Location: leeds, uk
Additional information;

The mid/bass has the following written on the back

MTX 2CX25 TDSN

M = chassis magnesium
TX = membrane “TPX”
2CX25 = size i think?
TD = something to do with the magnet?
SN = suspension “NORSOREX”, a kind of Neoprene,

8OHM

2CN12 = winds mobile 2 layers coppers (2C), on Nomex support, 12 mm length.

1377 - manufacturing number

The tweeter is a "MD900" by MA ( Monitor Audio )

Photographs of the crossover network in progress.

I'm under the impression replacing ageing electrolytic capacitors may improve things? They were 19 years old as of yesterday
  Reply With Quote
Old 22nd January 2007, 09:03 PM   #7
Code is offline Code  United Kingdom
diyAudio Member
 
Join Date: Jan 2006
Location: leeds, uk
tweeter crossover?
http://i14.tinypic.com/2nvqhdj.jpg

other crossover:
http://i13.tinypic.com/47bro14.jpg

mid/bass back
http://i13.tinypic.com/2q07g51.jpg

mid/bass front
http://i18.tinypic.com/4h1fzft.jpg

Maybe that ferrite coil could be improved?

ICW any good?
  Reply With Quote
Old 22nd January 2007, 09:15 PM   #8
Spasticteapot is offline Spasticteapot  United States
diyAudio Member
 
Join Date: Jan 2006
Location: Wisconsin....what did you expect?
Send a message via AIM to Spasticteapot
Monitor Audio is good stuff.

I'd replace the surrounds (if they're brittle), and all the capacitors inside. Double-check for voice coil rubbing, and maybe replace the internal damping - fiberglass insulation should work well.

If all else fails, just sell 'em and buy a pre-made pair of cabinets from Parts Express.
  Reply With Quote
Old 22nd January 2007, 09:58 PM   #9
Code is offline Code  United Kingdom
diyAudio Member
 
Join Date: Jan 2006
Location: leeds, uk
Thanks for the advice

Regarding the voice coil rubbing, im not sure how to check on this?
I have noticed there to be a small amount of 'gritty' resistance as i move the suspension up and down, could this be the voice coil?

Finally, are there capacitors you would recommend?
  Reply With Quote
Old 23rd January 2007, 01:22 AM   #10
Spasticteapot is offline Spasticteapot  United States
diyAudio Member
 
Join Date: Jan 2006
Location: Wisconsin....what did you expect?
Send a message via AIM to Spasticteapot
Quote:
Originally posted by Code
Thanks for the advice

Regarding the voice coil rubbing, im not sure how to check on this?
I have noticed there to be a small amount of 'gritty' resistance as i move the suspension up and down, could this be the voice coil?

Finally, are there capacitors you would recommend?

For caps, go with good old fashioned polyester. Apexjr has some at low prices.

Gritty resistance sounds like voice coil rubbing to me!
  Reply With Quote

Reply


Improving a set of speakersHide 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
Improving Vifa P17 paulspencer Multi-Way 22 24th July 2008 04:32 AM
Help me improving my pre-amp! thanh Solid State 0 26th January 2007 10:08 AM
improving bass response - yamaha speakers s115ivs sidpro Multi-Way 1 3rd April 2006 07:40 AM
improving the Mcintosh C22 Craig405 Tubes / Valves 22 13th July 2005 11:36 PM
improving my VAS djdamix Solid State 27 13th February 2005 12:54 PM


New To Site? Need Help?

All times are GMT. The time now is 02:50 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki