| AWESOME Kustom bass rig [message #22821] |
Sat, 02 May 2015 02:29  |
Iowa Boy
Messages: 767
Registered: June 2014
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Senior Member |
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Finally got my second K-250 today. $70 and only needs two replacement knobs and both of the lights in the switches. With the two 2-15's cabinets and my two amps now I can blow the windows out if I want to.
My question, and know we have talked about in the past, to connect the two amps together using a Y adapter and connecting to both amps. I never noticed it until today but the K-250 heads have monitor out jack which I assume was used to plug into a second cabinet that had the built in amp or was it intended for a recording device? Couldn't I just run a cord from this jack to the input of the other amp? Guessing with two amps running off of one signal that I would have to use the volume control on the bass to control the volume of both amps providing of course that the volume is set at the same level on both amps.
[Updated on: Sat, 02 May 2015 02:38] Report message to a moderator |
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| Re: AWESOME Kustom bass rig [message #22847 is a reply to message #22827] |
Mon, 04 May 2015 10:14  |
Iowa Boy
Messages: 767
Registered: June 2014
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Senior Member |
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Hey Bart, I have four of the 3-15 cabinets and a 400 but with the two 250's I'm getting 250 watts RMS and the 400 would only get 200. Also the 3-15's would be 5.33 ohms, you could only use 2 of those cabinets on the 400 and you would be loosing addition power since you were not at the 4 ohm load. That is why I opted for the two 250's instead........maximum rms at 4 ohms. The 4 cabinets I'm sure looked awesome but he would have been running the amp hot and loosing a lot of power as well......unless of course he was running two 400's. I also like the sound quality better on the 250's over the 400.
Also, I have to move my equipment myself, no roadie's........those damned 3-15's are heavy. Two's bad enough, but four is a killer!
[Updated on: Mon, 04 May 2015 10:24] Report message to a moderator |
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| Re: AWESOME Kustom bass rig [message #22851 is a reply to message #22847] |
Mon, 04 May 2015 14:17 |
pinkjimiphoton
Messages: 45
Registered: May 2015
Location: the dark side of the moon
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5.3 is close enough to 4 OR 8, really i'd imagine. a speaker is only at it's stated impedance with a 1k sine wave running thru it anyways, right? it's not as absolute as peeps normally think... a speaker's impedance can even become a conductance at some points if ya hook a digital meter to the back of a speaker and watch it a while... it's all over the place, with different dc resistances at different frequencies.
i would think if bud ross thought it was that concerning, he would have opted for loading his cabinets with speakers to reflect a more exact load. i'm new with solid state so may be on acid, but an ohm and 1/3rd difference isn't much of a difference, about the equivalent of adding a couple inches of wire between the speaker and the amp. with the usual 20 % tolerance, or even a more precise 10 or even 1% tolerance, 5.3 is close enough to 4 for rocknroll.
that's part of the reason speakers read off their ratings when checking their dc resistance. two 5.3r cabs would work out to almost 3 ohms, which is close enough to 4 ohms to probably make little difference, at least in practice if not in theory.
i always had assumed the 3x12'a and 3x15's were wired with two 16 ohm speakers in parallel, and one 8 ohm in parallel with that for a 4 ohm load (or series to take it back to 16)... never really looked at one. seems curious that it would be done in straight parallel if an exact load was required. at least to me. 
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| Re: AWESOME Kustom bass rig [message #22854 is a reply to message #22821] |
Mon, 04 May 2015 16:58 |
Iowa Boy
Messages: 767
Registered: June 2014
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Senior Member |
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Well the way I see it since the Kustoms were designed to use 4 ohm loads and since all the cabinets back then were 4, 5.3, 8, or 16 ohms depending on the speaker configuration, I'd rather be safe than sorry. I'm still getting maximum rms power at the designed ohm load. And I really don't need two more 15's at head level blasting in my ears anyway. Guess if Kustom did make a bass cabinet using 4 speakers and the parallel/series wiring and all speakers at 16 ohms, you could then use 4 cabinets with a 400 head......guess they did do that with the newer tuck and roll cabinets I think. Anyway, I'm happy and 250 watts rms is plenty of power to play anywhere I can imagine and in my book two cabinets with the two amps looks and sounds pretty cool. Won't get that look from todays suitcase amps.
[Updated on: Mon, 04 May 2015 17:17] Report message to a moderator |
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| Re: AWESOME Kustom bass rig [message #22857 is a reply to message #22852] |
Mon, 04 May 2015 17:15 |
pinkjimiphoton
Messages: 45
Registered: May 2015
Location: the dark side of the moon
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chicagobill wrote on Mon, 04 May 2015 16:26pinkjimiphoton wrote on Mon, 04 May 2015 13:17i always had assumed the 3x12'a and 3x15's were wired with two 16 ohm speakers in parallel, and one 8 ohm in parallel with that for a 4 ohm load (or series to take it back to 16)... never really looked at one. seems curious that it would be done in straight parallel if an exact load was required. at least to me.
The problem with that is the 8 ohm speaker will take twice the power that each of the 16 ohm speakers will.
So half of the amps' power output will go to the one 8 ohm speaker and half will be divided between the two 16 ohms speakers.
Other than that, you are correct in that the small differences in ohms will not make that much of a difference in power output.
thanks bill, did not know that about the voltage division, but i suspect it explains why sometimes projects using the same value but different voltage caps often seem to fail... i figured the bigger cap seems to win, maybe this explains it.
i had only thought about the impedance, not the load each speaker ends up seeing. awesome. i'm probably wrong about the caps, but i have noticed a lot of failures in pedals with mismatched voltage rating on caps.
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| Re: AWESOME Kustom bass rig [message #22868 is a reply to message #22821] |
Tue, 05 May 2015 00:09 |
Kustom_Bart
Messages: 601
Registered: October 2010
Location: Greenville, MichiGUN
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Senior Member |
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Pleat is correct, that is the best sounding Kustom bass cab I have ever heard, hands down! single 12" with a single 18" that thing was the BOMB!
With the K400 and four 3 x 15 cabs you also have to consider how much more air you are moving with all of the additional speakers as well. pinkjimiphoton is correct that is close enough to 4 ohms that you could never audibly know the difference. I am not a big metal face collector I have a K150 head and a mint challenger and that is it for me the rest is all plexi stuff. I know the K250's are loud and are even louder with the expansion cabs with the built in power amp as you can daisy chain them together forever...lol!
Also have a couple of vintage Tube amps one is a one of a kind MONSTER that will absolutely kill you if you max it out. Built by Bob Rissi who was the head engineer at Fender with Leo and head engineer at Rickenbacher and designed and built the transonic and still owns the one he built for Jimmy Page for Zeppelins first American Tour. It is a Solid state amp. I like all kinds of old amps, Pleat loves old Fenders....lol! That is another story in itself.
I do use two 2 x 15" + siren horn cabs loaded with altec 418's for my PA system and put them on top of single 18" peavey subs, I feel your pain, I am old with a bad back, it takes two to lift them now days. I haven't had my PA out in a year or two now...lol!
[Updated on: Tue, 05 May 2015 00:15] Report message to a moderator |
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| Re: AWESOME Kustom bass rig [message #22882 is a reply to message #22874] |
Wed, 06 May 2015 20:40 |
Kustom_Bart
Messages: 601
Registered: October 2010
Location: Greenville, MichiGUN
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Senior Member |
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It is actually two K200 heads in one box and you run 2 cabs from one side and 2 cabs from the other side, but you have to either A-B-Y box your input or use a Y cable. That is how you get away with four 3 x 15 cabs with it and then they run wide open too. Twelve 15: Altec 421's or JBL D-140's and that is a ton of quality air moving fo sho!  2.66 ohms is close enough to 4 ohms too and it will handle it.
[Updated on: Wed, 06 May 2015 20:43] Report message to a moderator |
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| Re: AWESOME Kustom bass rig [message #22885 is a reply to message #22884] |
Thu, 07 May 2015 01:12 |
Kustom_Bart
Messages: 601
Registered: October 2010
Location: Greenville, MichiGUN
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Senior Member |
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I am not sure on your head mine is a K400B-1 and has a knob on the front that you can turn to run it mono or stereo, turning one or both heads on. I am not sure on the D model, I know it still has two K200's in it, but not sure how they work as I haven't played with one. My back is toast, I can't and don't even lift the K400 head that I have...lol! I have a modern PA rack set-up with a Drive rack and an allen and heath board and all of the toys and run it through the Kustoms on stereo. All on wheels with ramps for the trailer.. easy peasy for my destroyed back. When you have cabs with Altecs or worse yet JBL's you don't lift them by yourself for sure.
[Updated on: Thu, 07 May 2015 01:22] Report message to a moderator |
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| Re: AWESOME Kustom bass rig [message #22895 is a reply to message #22894] |
Thu, 07 May 2015 18:34 |
pinkjimiphoton
Messages: 45
Registered: May 2015
Location: the dark side of the moon
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Member |
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i may have giant freekin hair still to go with my long ass beard, lol... never cared for that metal sludge... well, REAL metal...
uriah heep, purple... no wonger or metal licca shirts on this kid.
started playing in 69 when i was seven. have played everything from classical music to jazz, rock to blues, funk to country punk to fusion. currently lead a couple classic rock bands. most of my set list is pre dark side of the moon.
lotta blues, i've been known to pick and grin a little too, but i pretty much gave up on the south when ronnie van zandt went down.
tonite will be the usual, floyd, sam and dave, spencer davis, bb king, stuff like that. gotta guest bassist which always proves interesting.
keep on rockin bud. i remember when rock still rolled, and lyrics were something with melodys for 'em instead of chanted off kilter prose by guys making entirely too much money for making noise.
peace out.
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| Re: AWESOME Kustom bass rig [message #22905 is a reply to message #22898] |
Fri, 08 May 2015 13:30 |
pinkjimiphoton
Messages: 45
Registered: May 2015
Location: the dark side of the moon
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Member |
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Iowa Boy wrote on Thu, 07 May 2015 19:41You do have a sweet set-up. I've never came across one of the built in amp cabinets yet. I do have a stereo 400 guitar head with all the effects that needs repair and already have one 2-15 with horn cabinet for it and looking for another. The KEI speakers blew so need to get them re-built as well. Once this unit is together, I will have it recovered in the red sparkle.
My 250's set up is unfortunately in black....yeck.....and will recover everything in silver sparkle.
My PA with the 400, 300 and 200 heads with four 3-15's cabinets (two with sirens), two separate Altec horn cabinets, and two 4-8's cabinets will all be recovered in charcoal sparkle.
I would like to find a K-250 guitar head with all the effects and a K-600 PA head if they ever surface again.
i had a gold sparkle k250 hear in gold sparkle with all the effects that got lost to the sands of time a couple years ago around here
when the owner of a repair shop died. i'd sent it in for a cap job out of state and never saw i again. massachussettes seems to be full of old kustoms.
if you check craig's list for western mass, boston, and eastern connecticut and hartford county you may find one.
)
are you going to do the recovering yourself? wanna do one of mine ? <just joking>  i really like the silver sparkle, but the charcoal gets so sweet when it begins to yellow.. looks like gold flecks. beautiful
they turn up quite a bit in this area, if i see one affordable in good shape i'll post it.
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