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Bass 12" drivers!!!!!! [message #2580]

Tue, 11 March 2003 12:44

KustomBlues
Messages: 490
Registered: June 2001
Location: Michigan

Senior Member

Okay guys, here's some info on some bass 12" drivers: CARVIN also makes a nice bass 12 it's the PS12B, you have to ask for the B version. Eminece also makes some good bass 12's. They are the Eminence DELTA-12B 16 ohm drivers. Parts Express sells them for around $62 each and their part number is 290-415. They handle 300 watts each, voice coil 2 1/2", freq range 55-5,000 Hz. magnet weight 56 ounces. Let me know if you get some. :-) Deb

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Re: Bass 12" drivers!!!!!! [message #4401 is a reply to message #2580]

Mon, 28 June 2004 14:43

daddyplaysbass
Messages: 17
Registered: June 2004
Location: Arizona

Junior Member

Deb

I have a 1972 K150-2 head (says output 8 ohms) and a 2 X 12 cabonet, 2-12G. I want to put 2 12" bass spekers in and am leaning toward the Carvins. Do I run into Ohm problems? I have diagrams of the parallel and series wiring plus Carbving gives good advice. Would this essentially make teh 2-12G cabinet a 2-12B for gigging?
Thanks
Richard

Just Give Me the Key, and Let Me Be!! Daddy Plays Bass!!!

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Re: Bass 12" drivers!!!!!! [message #4408 is a reply to message #2580]

Tue, 29 June 2004 23:24

pleat
Messages: 1453
Registered: June 2004
Location: Belding, Mi

Senior Member

No problems with changing the speakers, just make sure each speaker is 16 ohms if you are going to wire the new speakers like the originals. Or order 4 ohms and wire them in series.
I would recomend ordering 16 ohm speakers and do the parallel wiring. This way if a speaker should go bad on a gig, you can always unhook the bad one and finish the gig. As long as you stay at or above the amps 8 ohm, your safe.
Don

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Re: Bass 12" drivers!!!!!! [message #4409 is a reply to message #4408]

Wed, 30 June 2004 09:50

daddyplaysbass
Messages: 17
Registered: June 2004
Location: Arizona

Junior Member

Don

Thanks for the info; I'll look for some 12's and install them. Have not looked inside yet.I want to keep the amp as original as possible. I put my Telecaster thru it last night even though I'm not a "guitar" player, wow!, I never realized Kustoms were great guitar amps too; sounds like it would be great for twangy country, the vibrato is real neat, I played some Duane Eddy tunes.

Thanks for all your suggestions and advice,
Richard

Just Give Me the Key, and Let Me Be!! Daddy Plays Bass!!!

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Re: Bass 12" drivers!!!!!! [message #4411 is a reply to message #2580]

Thu, 01 July 2004 07:21

stevem
Messages: 4745
Registered: June 2004
Location: NY

Senior Member

Hi gang.Heres something I have been keeping to myself in reguards to a mod I do to all my stand alone speaker cabs. If you get a double pole double throw toggle switch, you can wire it to take two 8 ohm speakers wired for 4 ohms and switch it the cab to 16 ohms. I mount the switch on a peice of aluminum L STOCK, and the mount that on the inside end of one of the port tubes so I can just reach in to set it for what I need depending if I am running 1 cab or 2. You paint the switch and bracket flat black and no one knows its their.In the smaller port tube of a k100 you will need a flat paddle type thing with a grove or noch, to reach in and throw the switch, maybe on the 200 tubes also if your hands are bigger than mine. Mine just make it. If any one wants a layout of the wiring let me know.

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Re: Bass 12" drivers!!!!!! [message #4413 is a reply to message #2580]

Thu, 01 July 2004 16:51

pleat
Messages: 1453
Registered: June 2004
Location: Belding, Mi

Senior Member

Great idea, I ran a switch system like you described in a 3x15 cabinet back in the 60's. My cabinet ran two 15's and the siren horn. I used the port hole to locate the switch that would either run the horn and speakers or just speakers, in case I was going to use the cabinet for bass.
The idea of having a switch to run the speakers in parallel or series is cool, one could make the modification, as long as each speaker are indeed 8 ohm each. The standard original speakers in the kustom 2x12 and 2x15 cabinets were 16 ohms each. Using the switch to convert the wiring of original speakers would give either a 8 ohm load or a 32 ohm load. The K200 heads produced 100 watts rms at a 4 ohm total load, and the K100-1 and K100-2 heads ran about 60 watts at a 8 ohm load and a little less with a 16 ohm load. I wouldn't recomend running the 100 heads with less than a 8 ohm load.
Don

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Re: Bass 12" drivers!!!!!! [message #4415 is a reply to message #2580]

Fri, 02 July 2004 07:26

stevem
Messages: 4745
Registered: June 2004
Location: NY

Senior Member

Hi gang. Now that I have basicly finished moving a second time this year, and in about 2 weeks should have more spare time after work, I need to take to task this whole k100 4 ohm 8 ohm thing, From a sonic and a technical veiw. Yes I know as others do about the output circuit differnce, but once a speaker, eitheir 4 ohm or 8 ohm is being driven by a signal, its impeadance is always higher than its ohm spec unless the tone it is driven with is lower than its free air resonant frequency.So if a given speaker is made at 8 ohms, and its resonant spec is 70 hz( quite normal for a guitar speaker, a bass driver would be around 40hz) than if you play 6 string guitar thru this speaker, with said guitars low E string being now where near lower than 200hz I do not see where any harm may come to the amp. What I see is that the 100s have 2500 mfd filter caps on the 40 volt rails, and the 200s have 4500 mfd caps. So when you drop a k100 down to 4 ohms, which will normaly let a soild state amp output 30% more wattage, which will make the output stage seek more current from the power supply, those 2500 mfd caps can not cut it if the amp is driven hard.And the k1100s power transformer will be on the edge current wise at 4 ohms if driven hard. Its my take at this point that if you are looking for mabe 10 or 15 more watts, which will give you a little more head room at 4 ohms for 6 string guitar, than go ahead!Just to be safe I would set small box fan blowing on the back of the head.

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Re: Bass 12" drivers!!!!!! [message #4416 is a reply to message #4415]

Fri, 02 July 2004 10:42

C4ster
Messages: 686
Registered: June 2001
Location: Mukwonago, WI (Milwaukee...

Senior Member

Totally true in all that you said. I would add one more point. At the lower load impedance, the emitter resistors are too large for that load and the amount of feedback to the differential stage will cause some stability problems. A K200 has, in essence, parallel emitter resistors and the load impedance can be lowered to 4 ohms. I would contend the emitter resistors are too large and COULD be reduced to 0.5 ohms which MIGHT be more stable at 4 ohms. (I have not tested this theory so don't crucify me.)
Conrad

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Re: Bass 12" drivers!!!!!! [message #4421 is a reply to message #4411]

Mon, 05 July 2004 19:21

KustomBlues
Messages: 490
Registered: June 2001
Location: Michigan

Senior Member

This is a good and useful mod!!

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Re: Bass 12" drivers!!!!!! [message #4422 is a reply to message #4401]

Mon, 05 July 2004 19:23

KustomBlues
Messages: 490
Registered: June 2001
Location: Michigan

Senior Member

The 150 heads are actually tagged to run 6-8 ohms.

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Re: Bass 12" drivers!!!!!! [message #4425 is a reply to message #2580]

Tue, 06 July 2004 07:32

stevem
Messages: 4745
Registered: June 2004
Location: NY

Senior Member

I have not compared the 100 to 200 schematics part for part, but I think that just changing the resistors will give you as stable of an amp as the 200s once you add the 4500 mfd caps, and how about a power transfromer from a junk k200? there is plenty of room for it.

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Re: Bass 12" drivers!!!!!! [message #4534 is a reply to message #2580]

Sat, 24 July 2004 01:15

QModer
Messages: 413
Registered: June 2003

Senior Member

I might like a couple of those speakers too at a later date Deb.

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Re: Bass 12" drivers!!!!!! [message #4542 is a reply to message #4534]

Mon, 26 July 2004 12:05

KustomBlues
Messages: 490
Registered: June 2001
Location: Michigan

Senior Member

Trust me on this, don't wait!!!!! Cool

Cool

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Re: Bass 12" drivers!!!!!! [message #4577 is a reply to message #2580]

Fri, 30 July 2004 08:34

rodak
Messages: 514
Registered: October 2001
Location: Georgia

Senior Member

I checked with my friend Bernie, at www.bltsound.com, and he sells the Eminence Delta 12B's for $60 each, or $57 each if you buy 2 or more.

www.combo-organ.com

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Re: Bass 12" drivers!!!!!! [message #4588 is a reply to message #2580]

Sat, 31 July 2004 00:47

QModer
Messages: 413
Registered: June 2003

Senior Member

Are they sixteen ohms?

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Re: Bass 12" drivers!!!!!! [message #4591 is a reply to message #4588]

Sat, 31 July 2004 10:41

rodak
Messages: 514
Registered: October 2001
Location: Georgia

Senior Member

Pretty sure - I believe the 12B"s are 16ohms - it's the same model number (Delta-12B) that Deb found at Parts Express. I got some Delta-15B's for my Kombo organ, and they were 16ohms. (Great sounding speakers, btw).

www.combo-organ.com

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