8 OHM JBL D130 Question - Use with Pro Reverb?

8 OHM JBL D130 Question - Use with Pro Reverb?

Postby thetumblerspdx » Sun Feb 26, 2012 3:36 pm

Hey,

I'm looking into getting a JBL D130 8 ohm speaker with thoughts of using the power and preamp section of my pro with a 1x15 cab with the D130. The pro ('73) is rated at 4 ohms. But since it is running two speakers it's 8 ohms right? So will using just one 8ohm speaker through an extension cab work with this? I know it's been covered before, but not sure if I'm going in the right direction with my 4 ohm with two speakers is 8 ohms math.

Thanks!
User avatar
thetumblerspdx
Wall of Sound
Wall of Sound
 
Posts: 13
Joined: Fri Feb 10, 2012 2:05 pm

Re: 8 OHM JBL D130 Question - Use with Pro Reverb?

Postby strumminsix » Sun Feb 26, 2012 3:40 pm

yes, 2 in parellel = 4 ohms. 2 in series = 16 ohms
http://www.prestonelectronics.com/audio/Impedance.htm
User avatar
strumminsix
Senior Member
 
Posts: 6634
Joined: Tue Apr 05, 2005 8:13 am
Location: Chicago

Re: 8 OHM JBL D130 Question - Use with Pro Reverb?

Postby Pete B. » Mon Feb 27, 2012 8:57 am

thetumblerspdx wrote:... So will using just one 8ohm speaker through an extension cab work with this?..


It will work, but the max output will be approx 30% less than if it were an identicle 4ohm speaker.
If you want the Output section to want to see an 8ohm load, pull either the two inner or two outer power tubes.
So now your power section is cut in half, but your speaker load is matched.
I'd try it both ways and see how it sounds.
What is the rated power output of your Pro???
I see they were either 40w or 70w:
http://jazzatelier.wordpress.com/2008/0 ... ro-reverb/
User avatar
Pete B.
Senior Member
 
Posts: 1771
Joined: Mon Jul 23, 2007 9:59 am
Location: Portland, Oregon

Re: 8 OHM JBL D130 Question - Use with Pro Reverb?

Postby thetumblerspdx » Mon Feb 27, 2012 10:05 am

It's 40 watts.
User avatar
thetumblerspdx
Wall of Sound
Wall of Sound
 
Posts: 13
Joined: Fri Feb 10, 2012 2:05 pm


Return to Loudspeakers

Who is online

Users browsing this forum: No registered users and 0 guests