VintageKustom.com: Repairing Kustom Amps

Home » VintageKustom.com » Repairing Kustom Amps » ohm problems

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

ohm problems [message #9520]

Wed, 16 July 2008 02:54

Forge
Messages: 41
Registered: February 2005
Location: In car trunk in Danville ...

Member

Hey my kustom pals!
Its been a long time since I've had to post here!
on a update I'm now using a K200 w/ 2x15" and a Sunn 0))) concert lead w/ 6x10" for my bass rig

The question is on the Sunn cab. It has the CTS 10s which I think was intended for guitar then bass but they still work really well.

I'm wanting to get more low end SO I thought the first place is to update the speakers, but the problem I keep running into is ohms.

I can't find any good speakers that are 32 ohms. I'm looking at some Mesas that are 16" ohms but if I'm thinking right it would be turn out to be 2 ohms wired parallel. The Sunn amp can only handle 4 ohm max and the cab says its 6 ohms. (however they got that)

Is there a fix or is there any speakers that you can recommend.

The people over at the Sunn forums are not that bright and all they know is there amps are big and loud. SO PLEASE KUSTOM PEOPLE HELP ME!

Bass Rig
Kustom K-200 w/ CTS 2x15"
Sunn Concert Lead w/ CTS 6x10"
Guitar Rig
Sears Silvertone Twin Twelve

Report message to a moderator

Re: ohm problems [message #9521 is a reply to message #9520]

Wed, 16 July 2008 06:47

stevem
Messages: 4744
Registered: June 2004
Location: NY

Senior Member

Hi, if the drivers in the sunn cab where 32 ohms, then it was wired in three parallel pairs of which those three sets where then all wired in parallel. That is two drivers in parallel for 3 16 ohm sets, and then those three sets wired in parallel for a 5.3 ohm total.
If you get all new 8 ohm drivers, but wire then in three sets of serise for 16 ohms, and then parallel those 3 sets you will end up at the same 5.3 ohm total, but with a different branch inductance that will most likly work better for bass, but may than be a tad dull for guitar as it would depend on the inductance spec of the new drivers you get.
The Eminence model Alpha 10" is a good driver that goes down to 45 cycles, so it will carry the low E string better than the drivers you have now, and the go up to 5k so they will work for guitar also.
The biggest impedment to getting more bass out of that cabinet is that if I recall right, it is not ported.
Porting would add up to half again as much bottom from that cab!

Report message to a moderator

Re: ohm problems [message #9522 is a reply to message #9520]

Wed, 16 July 2008 06:52

stevem
Messages: 4744
Registered: June 2004
Location: NY

Senior Member

Now that I thing about it, if I where you, I would leave the Sunn cab as is and change out the 2 CTS 15s in the Kustom cab for something like the Eminence model Delta 15 or the Electro Voice model EVM-B.
Either of these two drivers will double your K 200s punch compared to the CTS drivers.

Report message to a moderator

Re: ohm problems [message #9523 is a reply to message #9520]

Wed, 16 July 2008 14:56

Forge
Messages: 41
Registered: February 2005
Location: In car trunk in Danville ...

Member

Thanks stevem!

I have some JBL E140's on order for the kustom

I'm alittle shy on the wiring scheme
do you have a schematic of what that would look like?

Report message to a moderator

Re: ohm problems [message #9524 is a reply to message #9520]

Wed, 16 July 2008 15:10

Forge
Messages: 41
Registered: February 2005
Location: In car trunk in Danville ...

Member

Here are the speakers I'm looking at
Eminence Alpha 10a
Eminence BP102
Carvin PS-10
Weber Cali 10

On the ports what do you think about 4 4" flared ports?

Report message to a moderator

Re: ohm problems [message #9525 is a reply to message #9520]

Thu, 17 July 2008 12:32

stevem
Messages: 4744
Registered: June 2004
Location: NY

Senior Member

Speaker wise I could not find the freqency range of the weber driver to judge it.
The carvin is a Eminence made driver and would work well.
The BP109 only goes up to 2000 Hz and would sound pretty dull, its really just a woffer for a 2 or 3 way system.
For my money I would be happy with the alpha driver.

4 inch ports would work fine with the cone area of 6 10" drivers if you have room on the baffle.

To wire the 6- 8 ohm tens first make the three 2 speaker serise set ups.
Take the minus from the first driver and connect it to the hot of the second driver, thats one serise wired pair, do that to the other two sets of drivers.
Next jump all the hots on the three first drivers together and connect that to the hot of the jack.
Then do the same for all the minus connections on the second drivers or each pair and run that to the low/minus connection on the jack and your done.

Report message to a moderator

Re: ohm problems [message #9526 is a reply to message #9525]

Thu, 17 July 2008 22:54

Forge
Messages: 41
Registered: February 2005
Location: In car trunk in Danville ...

Member

Thanks again!

I think I like the alphas too! mostly because of the price is right for me!

Forge

Report message to a moderator

Previous Topic:	K200B-5 with bad RCA Jack ???
Next Topic:	Stupid question regarding K-100-2 vib and reverb.......

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Thu Jun 06 08:24:11 EDT 2024