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Difference between 8 ohms and 16 ohms [message #8529] Thu, 12 April 2007 12:01   kustom bassist Messages: 14 Registered: January 2007 Junior Member Hi Gang: Here is another newbie question from my lead guitar member: When playing a Kustom K200 amp head, what would be the difference between the 2 cabinets one with JBL D130s 2 x 15 8 ohms and the other JBL D130s 2 x 15 16 ohms? Thanks KB Report message to a moderator

Re: Difference between 8 ohms and 16 ohms [message #8532 is a reply to message #8529] Thu, 12 April 2007 12:42   stevem Messages: 4736 Registered: June 2004 Location: NY Senior Member With a 16 ohm cab the amp will only output about 38 watts RMS, At 8 ohms it puts out about 75 watts, and into 4 ohms it will pump out 100 watts RMS. As you go up in impeadance the amp will clip earlyer and have less punch, but that may not be a bad thing depending on how loud you need to play in relation to the gig size. Report message to a moderator

Re: Difference between 8 ohms and 16 ohms [message #8534 is a reply to message #8529] Fri, 13 April 2007 00:30   kustom bassist Messages: 14 Registered: January 2007 Junior Member Dear Stevenm: Thanks for the info, and sorry for the newbie questions, lets me see if I got that right....... if we took the 2 X 15 JBL D130 16 ohms and connected them parallel for 8 ohms then the K200 amp head would have an output of 75 watts, thus being louder than the original configuration. Right? KB Report message to a moderator

Re: Difference between 8 ohms and 16 ohms [message #8535 is a reply to message #8529] Fri, 13 April 2007 06:34   stevem Messages: 4736 Registered: June 2004 Location: NY Senior Member I do not know what you mean by"your orignal configuration"but yes, as you go down in impeadace you gain wattage.The amp will not bet twice as loud at 8 ohms compaired to 16 ohms but you will pick up more volume, and inturn more head room. Report message to a moderator

Re: Difference between 8 ohms and 16 ohms [message #8540 is a reply to message #8529] Fri, 13 April 2007 14:58   kustom bassist Messages: 14 Registered: January 2007 Junior Member Thanks Stevenm for your input. I beieve the original configuration is the speakers are wired in serial, not sure until I open the back and check them out. Whatever it is now, I will experiment and wired them different, then test the rig out. Thanks again KB Report message to a moderator

Re: Difference between 8 ohms and 16 ohms [message #8543 is a reply to message #8529] Mon, 16 April 2007 06:44   stevem Messages: 4736 Registered: June 2004 Location: NY Senior Member Kustom cabinets where never wired in serise, they used eitheir 2 16 ohm drivers, or 2 8 ohm drivers wired in parallel. Report message to a moderator

Re: Difference between 8 ohms and 16 ohms [message #8544 is a reply to message #8543] Mon, 16 April 2007 08:33 C4ster Messages: 686 Registered: June 2001 Location: Mukwonago, WI (Milwaukee... Senior Member I don't think the Kustom 100-200-400 series ever used 8 ohm speakers except in the 4x12 PA columns. I just opened a K100 1x15 on Saturday and replaced the CTS 15" with a JBL E140 just for fun. It taxed the amp something fierce because of the weak filter caps. But I checked the speaker resistance and it read 11.4 ohms indicating a 16 ohm speaker. That means Kustom only used 16 ohm speakers universally in their cabs and the cabs were 8 ohms, period. The only change to that rule would have been the 3x15 speaker cabs not sirens. The 3x15 were 5.3 ohms. All parallel! The 4x12 PA cabs were series/parallel to get 8 ohms. Conrad Report message to a moderator

Re: Difference between 8 ohms and 16 ohms [message #8545 is a reply to message #8543] Mon, 16 April 2007 08:35 C4ster Messages: 686 Registered: June 2001 Location: Mukwonago, WI (Milwaukee... Senior Member I missed something you said Steve, I have never seen a 4 ohm cabinet. When were those built? Conrad Report message to a moderator

Re: Difference between 8 ohms and 16 ohms [message #8546 is a reply to message #8529] Tue, 17 April 2007 06:58   stevem Messages: 4736 Registered: June 2004 Location: NY Senior Member Conrad, I should have posted That the 3-15 or 3-12 cabinets housed 16 ohm drivers in parallel like you posted, but my ross built 2-15 1967 horizontial cabinet(with ports but no port tubes) has 8 ohm CTS drivers in parallel! This messed me up for a while early on as I got the cabinet from the original owner and I know he never popped it open to change or re-wire speakers as it was all he could handle to figure out how to hook up his vox organ to it! No realy, On the day he bought the organ and the amp he got it home and could not remmember how to hook the stuff up, me being the kid next store that he knew was taking electric guitar lessons got called over to get it working for him, so like I said I KNOW he never had been in the cabinet. So it came from kustom wired for 4 ohms. Production line mistake, or test dummie that got out of the factory, who knows at this point?Some companys do not waste anything, Leo Fender has been found to have sent out some every different test mule amps that he had played with under the guise of a regular production model.So of them sounded great, and some should have been tossed in the trash! Report message to a moderator

Re: Difference between 8 ohms and 16 ohms [message #8547 is a reply to message #8546] Tue, 17 April 2007 08:58 C4ster Messages: 686 Registered: June 2001 Location: Mukwonago, WI (Milwaukee... Senior Member Always something new and different! Conrad Report message to a moderator

Re: Difference between 8 ohms and 16 ohms [message #8548 is a reply to message #8547] Tue, 17 April 2007 11:32 chicagobill Messages: 2005 Registered: April 2003 Senior Member Steve/Conrad: I also have an early non-ported, 2-15, horizontal cabinet, that has the original 8 ohm CTS speakers wired in parallel for 4 ohms. Bill Report message to a moderator

Re: Difference between 8 ohms and 16 ohms [message #8549 is a reply to message #8529] Wed, 18 April 2007 06:40   stevem Messages: 4736 Registered: June 2004 Location: NY Senior Member Bill, mine has internal bracing on the verticle walls that make it look like Kustom was thinking about holding the cabinet up in a tiltable stand like the latter PA heads. Is yours that way on the in side also? Report message to a moderator

Re: Difference between 8 ohms and 16 ohms [message #8551 is a reply to message #8549] Thu, 19 April 2007 11:03 chicagobill Messages: 2005 Registered: April 2003 Senior Member Steve: It's been a long time since I've had the back off of the cabinet, so I don't remember. I will try to pull the back off the cab this weekend and I'll let you know. Bill Report message to a moderator

Re: Difference between 8 ohms and 16 ohms [message #8552 is a reply to message #8529] Thu, 19 April 2007 12:29   stevem Messages: 4736 Registered: June 2004 Location: NY Senior Member Thank`s Bill, it will be interesting to find out! Report message to a moderator

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