VintageKustom.com: Replacement Part Suggestions » (2) JBL D140F cabinets

Home » VintageKustom.com » Replacement Part Suggestions » (2) JBL D140F cabinets - different ohm speakers?

Show: Today's Messages :: Show Polls :: Message Navigator

(2) JBL D140F cabinets - different ohm speakers? [message #5637]

Thu, 24 March 2005 00:21

MikeS
Messages: 2
Registered: March 2005

Junior Member

I have (2) 2X15 JBL cabinets that I want to use with the K200B-1 head. When I restored the first cabinet, it had (2) D140Fs marked "8 ohms".
Later, I found another identical (I thought) D140F cabinet and when I opened it up to clean/restore it, I was surprised to find the speakers said "16 ohms" on them. Neither cabinet looked like it had ever been opened and everything inside looked original. Now I don't know whether I can use both cabinets, or look for another match so that they present an identical load to the head. Can I rewire one/both cabinets for simultaneous use with this head? If so, will I always have to use both cabinets after that? Did Kustom produce two versions of this cabinet??

Report message to a moderator

Re: (2) JBL D140F cabinets - different ohm speakers? [message #5638 is a reply to message #5637]

Thu, 24 March 2005 08:26

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

My cure would be to put 1- 8 ohm and 1-16 ohm wired in paralle in each cab. that would come out to 10.6 ohms per cab, so when they get wired to the head you would have 5.3 ohms.When you run just one cab you will only have a 75 watt RMS amp, not 100 watts, but for a practice type time it should be ok.

Report message to a moderator

Re: (2) JBL D140F cabinets - different ohm speakers? [message #5639 is a reply to message #5637]

Thu, 24 March 2005 08:29

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

The 8 ohm speaker in each cab will be a little louder than the other, but from what I have found, if you stand more than 4 ft away you can not tell.

Report message to a moderator

Re: (2) JBL D140F cabinets - different ohm speakers? [message #5643 is a reply to message #5639]

Thu, 24 March 2005 19:08

LesS
Messages: 477
Registered: December 2002

Senior Member

I once had a 2 x 12 Kustom cabinet with mismatched speakers. It was OK for home use if you weren�t too fussy. I had the loudest one on top. But in my case, it was not good for stage use as you don�t get much output out of the higher impedance speaker � the sound and projection were comparable to playing a 2x12 with only one speaker installed.
Also, Mike you should measure those JBLs with an ohm meter, they could have been reconed with a different impedance kit - for example the 16 ohm ones could have been reconed as 8's.
-Les S

[Updated on: Thu, 24 March 2005 19:13]

Report message to a moderator

Re: (2) JBL D140F cabinets - different ohm speakers? [message #5644 is a reply to message #5637]

Thu, 24 March 2005 19:46

MikeS
Messages: 2
Registered: March 2005

Junior Member

Thanks for the suggestions. I guess the larger question is... why the different impedence speakers in seemingly identical cabinets? I speculate that the cabinet w/16 ohm speakers was part of a factory dual cabinet build such as the 4-D140f - while the cabinet w/8 ohm speakers was part of a single cabinet build such as the 2-D140f? Do musicians with the 4-D140f setup ever use only one cabinet? Wouldn't that present an 8 ohm load to the head? What do you think?

Report message to a moderator

Re: (2) JBL D140F cabinets - different ohm speakers? [message #5647 is a reply to message #5637]

Fri, 25 March 2005 08:13

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

I made a math mistake yesterday.A 16 ohm and a 8 ohm in parralle is 5.3 ohms, So both cabs wired like that would let you have the full 1oo watts RMS when you used a single. But to use 2 you will have to make up a short cable or box to put both cabs in serise, and have about a 10 ohm set up.You will loose some wattage, but the added SPL level of 4-15s should make up for it.The only other way to do it would be to put 2 16 ohms wired for 8 ohms in one cab, and then 2 8 ohms wired in serise for 16 ohms in another cab. Then when running both you would have 5.3 ohms.But eitheir cab seperate will never get you max watts.Yes when you bought a Kustom with 4-15s they where 16 ohm units.Sorry for the mistake, I was too pressed for time yesterday!

Report message to a moderator

Previous Topic:	Jensen - CTS swap
Next Topic:	Kustom Lead III SC

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sun Apr #d 01:04:20 EDT 2024

.:: Contact :: Home ::.