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

How close is close?
How close is close?
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
Thread Tools Search this Thread
Old 12th February 2004, 10:13 PM   #1
Regis is offline Regis  United States
diyAudio Member
Join Date: Jan 2004
Location: Palmdale Ca
Default How close is close?

Boy, I've been learning a lot about speakers lately (maybe that's a bad thing!), but I found this Italian website that lists the values for many JBL speakers www.caninialtoparlanti.it/JBL1.htm . Zach is right, those 128H's are a very tough find. Never been sold on Ebay either (not by that name anyway). I compared the various drivers and came up with a few that are pretty close and have been available on Ebay. Maybe the X-overs would have to be mod'd out to accommodate the differences.

I found the following to be very close in spec to the 128H. I'll list the 128 value first, followed by the alternative. Models 128H/2214H, FS 20/23, Vas 9.9/7.9, QMS 7/10.2, QES 0.25/0.25 (same Electrical Damping, different mechanical damping). QTS 0.24/0.24 Pmax (watts) 100/200 Resistance 5.7/5.6, Diameter 10.2/10.2, Xmax 0.31/0.26, LE 0.7/1.3 Sensitivity 92.9/94.05, Efficiency 0.86/1.1 (greater sensitivity = greater efficiency?)

Model 128H/LE14A FS 20/28, Vas 9.9/5.2, QMS 7/6.5, QES 0.25/0.34 QTS 0.24/0.32, Pmax (watts) 100/100 Resistance 5.7/6.3, Diameter 10.2/11.4, Xmax 0.31/0.2, LE 0.7/1.4 Sensitivity 92.9/92.9, Efficiency 0.86/0.95

My question is, just how close is close and will these speakers work in the 41 inch high L-150 cabs and sound "reasonably" good?
  Reply With Quote
Old 13th February 2004, 05:01 AM   #2
roddyama is offline roddyama  United States
diyAudio Moderator Emeritus
roddyama's Avatar
Join Date: Jan 2002
Location: Michigan
Hi Regis,

The T/S parameters for many of the JBL drivers are available from the JBLPro site.

Both the drivers you've found should have similar low end behavior, but the higher L will cause them to roll off in the mid range faster. Don't know for sure, but they may not react the same to the x-overs in the range from 5-600Hz and up. The LE 14 has the added disadvantage of being a different size (14").
Rodd Yamashita
  Reply With Quote


How close is close?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Who knows Close Box for 18w/8531g00e ? amro Multi-Way 5 2nd January 2008 12:22 PM
2 Transformers close together... matic Solid State 4 7th December 2006 04:39 PM
CD player Drawer open close open close open close qguy Digital Source 7 23rd November 2006 08:58 PM
how to close a thread kASD Forum Problems 3 20th January 2004 07:27 AM
F3 too close to XOVER?? Help! birkinshawc Multi-Way 27 7th January 2004 06:25 AM

New To Site? Need Help?

All times are GMT. The time now is 04:08 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio