CrossOver - Page 3 - diyAudio
Go Back   Home > Forums > Live Sound > PA Systems

PA Systems A forum for discussion of all parts of a sound reinforcement or DJ system: loudspeakers, mixers (desks) 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
Reply
 
Thread Tools Search this Thread
Old 6th November 2012, 08:07 PM   #21
diyAudio Member
 
Join Date: Oct 2012
Ontario
at the hub of the great lakes
i think wg _ski is referring to a tungsten filament lamp you would wire this in series with the horn driver to protect it. it forms a voltage divider i've seen these used in passively x-over monitors to prevent feedback from destroying the diaphram.the net effect is when you've reached the current limit determined by the wattage of the lamp it lights up reducing the voltage the drop across your horn protecting it
  Reply With Quote
Old 6th November 2012, 08:28 PM   #22
EddieL is offline EddieL  St Lucia
diyAudio Member
 
Join Date: Nov 2012
Understood,found the thread and got the # of the bulb. I will work on the boxes and let you know what I have found.
  Reply With Quote
Old 11th November 2012, 06:02 PM   #23
EddieL is offline EddieL  St Lucia
diyAudio Member
 
Join Date: Nov 2012
Quote:
Originally Posted by turk 182 View Post
probably not much more then 60 to 100 watts so refining our guesstimates the 15's could be 250 rms each and that's not knowing what the realitive efficency of these drivers (1 watt/ 1 meter spl rating) another clue would be looking at the wire size in the x-overs coils in the box that gauge would help determine what was intended. while your poking around see if you can confirm if there wired series or parallel i think it will turn out parallel and count how many coils and caps on the x-over that tell us just how much separation between bands we've got 6 db/octave 12 etc values on the caps too oh and double check to see if there isn't a number stamped on the frame maybe on one of the ribs supporting the magnet the other place might be a small label on the magnet that you might not see if your looking through the opening in the back panel an inspection mirror can come in handy
Okay Turk. What I have found is. The speakers were wired parallel and were 16 ohms ea. using my meter but could not get a reading from the tweeter, nothing in there has any info.I have attached a pic of the x-over. Check your inbox.
Attached Images
File Type: jpg DSC02921.jpg (102.4 KB, 61 views)

Last edited by EddieL; 11th November 2012 at 06:05 PM.
  Reply With Quote
Old 11th November 2012, 07:05 PM   #24
diyAudio Member
 
Join Date: Oct 2012
hi eddie
it does appear to be a 6 db/oct x-over with a resistor to pad the horn.was the parallel connection to the two fifteen straight off the jack plate i hope that you've made some notes as to how everything was wired or have only disassembled one. was the x-over input just another parallel feed off the input and it's output direct to the horn?
if you could draw up a schematic of the box wiring and components and get a picture of the input plate(speakon 1/4 in. jacks)
you mentioned not getting a reading across the horn i hope it's not a case of blown diaphragm or are you maybe looking at a piezzo element horn?
thank
turk 182

Last edited by turk 182; 11th November 2012 at 07:15 PM.
  Reply With Quote
Old 11th November 2012, 07:39 PM   #25
EddieL is offline EddieL  St Lucia
diyAudio Member
 
Join Date: Nov 2012
Ok, The two fifteens were connected in parallel on the x-over. If you look at the pic to the top you will see an "M" with + & - and the Horn was connected by the resistor with the "T" with the + & -. I think the horn is a piezzo. It can screw off so I will change them to drivers.

Last edited by EddieL; 11th November 2012 at 07:47 PM.
  Reply With Quote
Old 11th November 2012, 08:30 PM   #26
diyAudio Member
 
Join Date: Oct 2012
you may be able to see a high impedance (1/2 meg to 3 meg some can be higher) across some piezzo elements
so we've identified a short coming
well i hope what's been done isn't gonna prevent you from returning these speakers.
but if your still set on rebuilding them as a learning experience let's move on..
so by now not knowing your level skill or understanding what would you say is weak/bad/going on here?
  Reply With Quote
Old 12th November 2012, 12:59 AM   #27
EddieL is offline EddieL  St Lucia
diyAudio Member
 
Join Date: Nov 2012
I will rebuild them.
Well, what I can tell you for sure is that the components in these boxes are crappy.I am going to replace the horn drivers.Since I will be using the fifteens as mids, I would have to hear how they sound.

Did you get my message?
  Reply With Quote
Old 12th November 2012, 01:20 AM   #28
diyAudio Member
 
Join Date: Oct 2012
hey eddie
i want to start by addressing you mentioning upgrading the horn driver do we know for sure what it is as in piezzo or bad diaphragm. secondly if it was on a screw thread to the horn it might be advisable to replace your horn/flare and driver on the basis that it might be hard to find something that both fits that thread and is not just a better driver on a cheap flare.
the other thing i was hoping to see if you knew was bad was the x-over and more importantly why? cheap parts aside.
in terms of the 15's for the evolution we're going after they may be fine

did you PM me?

Last edited by turk 182; 12th November 2012 at 01:29 AM.
  Reply With Quote
Old 12th November 2012, 01:45 AM   #29
EddieL is offline EddieL  St Lucia
diyAudio Member
 
Join Date: Nov 2012
Yes,I PM you earlier today.
It's a piezo for sure(see attached pic,looks like this).They still work.Looks like an 1 3/8 thread(Horn/Flare looks like one in pic). As for the cross overs,they are only two way,the frequencies will be very limited. When it comes to the 15s as I said in the previous message I will have to hear them in their new capacity first.
Attached Images
File Type: jpg 41sYrQ9SBfL.jpg (21.4 KB, 51 views)
File Type: jpg 19hh.jpg (19.8 KB, 47 views)

Last edited by EddieL; 12th November 2012 at 02:11 AM.
  Reply With Quote
Old 13th November 2012, 12:49 PM   #30
EddieL is offline EddieL  St Lucia
diyAudio Member
 
Join Date: Nov 2012
PAGING.....TURK... Where have you gone????
  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
Crossover or not....... 503Timber Multi-Way 1 21st June 2011 05:51 AM
To crossover or not or ? asiquis Multi-Way 17 15th November 2009 04:52 AM
Crossover for vifa 2 way setup - how can I find out what this crossover is doing? Tino Multi-Way 11 17th May 2009 05:21 AM
Passive crossover into active crossover hahfran Multi-Way 16 10th February 2008 07:16 PM
Can you hear the crossover point of a speaker with a well-designed crossover? 454Casull Multi-Way 11 2nd April 2004 06:48 AM


New To Site? Need Help?

All times are GMT. The time now is 06:12 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