omfg JBL speakers - 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 16th January 2002, 07:59 AM   #1
griff is offline griff  Australia
diyAudio Member
 
griff's Avatar
 
Join Date: Dec 2001
Location: Melbourne
Default omfg JBL speakers

I have just opened up my pair of JBL MX 300 speakers to find an empty box, a tiny, crappy Xover and drivers that could only be called toys.

WARNING, open up a box b4 buying speakers.
  Reply With Quote
Old 17th January 2002, 12:57 AM   #2
Bose(o) is offline Bose(o)  Canada
diyAudio Member
 
Join Date: Dec 2001
Location: Ottawa, Ontario, Canada
Default I know what it's like..

I first opened up my mom's pair of Technics SB-282 speakers and found the smallest xover attached behind the spring clips, the rest was just open space. I also saw another example, my friend's Polk Audio towers....What's with that?? Other than the fact that they use PCB.
  Reply With Quote
Old 17th January 2002, 01:12 AM   #3
diyAudio Member
 
Join Date: Feb 2001
Location: Columbia, SC
You're surprised?
Low and mid-fi speakers generally use pretty inexpensive drivers (often less than a dollar--two or three dollars, tops--when purchased in 1000 piece lots) assembled overseas where labor is cheap.
Crossovers are generally as cheap as they can make them. Having a PC board isn't necessarily a measure of quality; many excellent crossovers use point-to-point wiring. The main benefit of a PCB (aside from giving the parts a physical mounting system) is to reduce wiring errors. This is a non-trivial benefit when you're talking about folks who know nothing about electronics soldering parts together for a dollar an hour. If the parts aren't silk screened onto the PCB, you can assume that there was a big diagram on the wall above the workbench for easy reference.

Grey
  Reply With Quote
Old 17th January 2002, 01:28 AM   #4
diyAudio Member
 
dlharmon's Avatar
 
Join Date: Nov 2001
Location: TN, USA
The crossover in a pair of yamaha speakers I have consists of 2 capacitors in series with the mid and tweeter


Darrell Harmon
  Reply With Quote
Old 17th January 2002, 01:58 AM   #5
Super is offline Super  United States
diyAudio Member
 
Join Date: May 2001
Location: Connecticut
Send a message via AIM to Super
At least yours got 2 capacitors...

(JVC's, circa early early-mid 90's, bass driver running full range)
__________________
Bryan
  Reply With Quote
Old 17th January 2002, 07:31 AM   #6
diyAudio Member
 
Brett's Avatar
 
Join Date: Jan 2002
GRollins is right, about the cost issues. The budget end of the market is extrmely competitive, and the more 'audiophile' brands will often sacrifce some margin to get you in, hoping to make it back when you upgrade later.

BUT, how do they sound? If they are good sounding (wrt pricepoint), and they only have simple crossovers, that tells me the designer did a good job optimising all the parameters. I have yet to find in audio that making something more complex, beyond what's neccesary, makes it sound better.

For example most 6" mid-basses will start to break up somewhere above 2.5kHz at moderate levels, with metal cones being the worst usually. If you don't want to hear all that rubbish, you have to either(a) use higher order, more complex x-over (b) tweeter that will work at lower frequencies (c) better mid-bass with simple x-over. Drive units only work in a limited frequency range, and the drive unit's deigner must make lots of decisions and compromise the performance in some areas even in very high cost / high performance drivers. My mid/high Pro drivers cost $US1500 ea, and I only use one cap to cross them over. That's all they need.

Then of course, there are Lowther, Fostex, Goodmans, Diatone, Eminence etc drivers that need no crossover at all.
  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
5.1 DIY kit with on PA speakers (or good & small DIY kit with PA speakers) ? jm_kzo Multi-Way 54 22nd April 2009 07:54 PM
Studio monitor speakers as Hi Fi speakers? MRod Multi-Way 2 27th March 2009 05:07 AM
Built differences between Guitar Speakers and PA Speakers? agadis PA Systems 7 24th September 2007 08:22 AM
How would you compare your DIY speakers to commercial speakers? AJ Bertelson Multi-Way 20 28th May 2004 03:20 PM


New To Site? Need Help?

All times are GMT. The time now is 07:38 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