Ohms? - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 31st January 2009, 05:01 PM   #1
ddoyle is offline ddoyle  United States
diyAudio Member
Join Date: Feb 2006
Location: oregon
Default Ohms?

I am working on a surround speaker project. I want to try using some auto speakers for the rear and side channels(7.1). I am looking at using some JBL's that were used in some of the higher end ford and lincolns. They have about a 4" woofer and 1" tweeter, self contained in a plastic housing. Now I have not tested these yet, assume they are 4 ohm, what do I need to make them compatable with my system, 8ohm. Resistors? My reasons, speakers are easy to find, cheap and already have a housing,may need to work on the appearance end, and have a small footprint. Thanks for your input!
  Reply With Quote
Old 31st January 2009, 09:31 PM   #2
HK26147 is offline HK26147  United States
diyAudio Member
Join Date: Jan 2008
If you verify that they are indeed 4 ohm cabs:
Wire 2 in series for 8 ohms with 1 cab inverted on top of the other...
So you have a 4", T, T, 4" module.
you could use an L-pad and just burn off the excess power.
  Reply With Quote
Old 31st January 2009, 10:45 PM   #3
diyAudio Moderator Emeritus
Iain McNeill's Avatar
Join Date: Oct 2007
Location: Santa Cruz, California
most respectable HT amps should be able to handle 4ohms as long as you don't do anything exotic with the crossovers.

It'll be louder and so the volume knob could go all the way to "self-destruct" (12)

Just start with the volume low and proceed carefully. Adding series resistance to the speaker will impact the bass
  Reply With Quote
Old 1st February 2009, 07:35 PM   #4
diyAudio Member
Join Date: Jun 2007
Well, if these are Car speakers, then likely they are 4 ohms. That in and of itself shouldn't be a problem as has already been said; any respectable AV amp should be able to handle 4 ohm speakers.

However, the speakers in question are only 4", so it should be very easy to put two of them in one reasonably small cabinet, and wire them in series.

You could make the side speakers with angled fronts, in essence making the speakers di/bi-pole speakers. Have one of the 4" angled slightly to the front and the other angled slightly to the rear to disperse the sound a little better.

Then for the Rear speakers simply stack two 4" speakers together in a standard rectangular box, flat front, cabinet.

So, that solves the problem for Surround speakers, what were you planning to do for the fronts?

  Reply With Quote
Old 1st February 2009, 07:53 PM   #5
HK26147 is offline HK26147  United States
diyAudio Member
Join Date: Jan 2008
I am not familiar with JBL product that ddoyle mentioned.
I was given a small JBL satellite ( to repair ) that sounds very similar to what was mentioned - a 4" and a 1" piezo diaphragm.
It was not designed to be repaired - you can only buy a completed satellite.
This product was used by contractors on new construction and entertainment room renovations.
It didn't handle much power; a room has considerable more volume to fill then a car; so I thought wiring 2 in series would be prudent.
  Reply With Quote
Old 2nd February 2009, 03:28 AM   #6
ddoyle is offline ddoyle  United States
diyAudio Member
Join Date: Feb 2006
Location: oregon
Thank you all for the replies. I will have my hands on the speakers this week. The front speakers I have been alternating between AR-3s, Mcintosh xd715s and wharfedale w70c. Have not made up my mind which I like best. Cntr is a Zetag kinima. currently running a pair of AR tsw110s for the sides and a pair of smaller Advents in the rear, mini monitors i think.
  Reply With Quote
Old 3rd February 2009, 03:38 AM   #7
ddoyle is offline ddoyle  United States
diyAudio Member
Join Date: Feb 2006
Location: oregon
they are indeed 4 ohm. here are a few shots of what i am working with. This is from the front, have not pulled a set out of the rear deck, they may be larger.
  Reply With Quote


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
ISOBARIC 16 ohms load powered by 8 ohms Amp eddi0 Subwoofers 24 21st October 2006 03:29 PM
Speakers: 8 ohms vs. 16 ohms KT Multi-Way 2 14th April 2006 05:06 PM
4 ohms vs 8 ohms carieux22 Everything Else 5 16th July 2005 12:53 AM
where to buy 16 ohms l-pad ger56 Multi-Way 0 11th October 2004 11:11 PM
zen on 4 ohms trancy Pass Labs 5 29th February 2004 06:54 PM

New To Site? Need Help?

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

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2