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Post subject: 16 ohm cab for Super Champ x2
Posted: Sat Dec 06, 2014 6:51 pm
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On the back of the amp, it says "8 ohms min" which I think stands for "a minimum of 8 ohms".

I have a 16 ohm cab. I want to make sure that it's ok to attach a 16 ohm cab to my Super Champ x2.

Are there any side effects such as making it work the tubes harder... not sounding as good... or any other "dangers" as opposed to using an 8 ohm cab with the amp?


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Post subject: Re: 16 ohm cab for Super Champ x2
Posted: Sat Dec 06, 2014 7:45 pm
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Read the manual the amp is optimized for 8 OHM, I am no expert I just follow what the manual says....

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Post subject: Re: 16 ohm cab for Super Champ x2
Posted: Sat Dec 06, 2014 10:16 pm
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wasp89 wrote:
On the back of the amp, it says "8 ohms min" which I think stands for "a minimum of 8 ohms".

I have a 16 ohm cab. I want to make sure that it's ok to attach a 16 ohm cab to my Super Champ x2.

Are there any side effects such as making it work the tubes harder... not sounding as good... or any other "dangers" as opposed to using an 8 ohm cab with the amp?


My understanding is that going up to a 16 ohm cab will not hurt the amp and should be fine. It is about the output transformer and not the tubes.

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Post subject: Re: 16 ohm cab for Super Champ x2
Posted: Sun Dec 07, 2014 4:24 pm
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It was this video here that got me thinking about how a 16 ohm load on an 8 ohm might be an issue.

Check out after 4:50

https://www.youtube.com/watch?v=F1GHg3gJCts


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Post subject: Re: 16 ohm cab for Super Champ x2
Posted: Sat Mar 07, 2015 6:12 am
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I had the same issue and could never get a clear , definite answer so I ended up buying a 8 ohm speaker just to be sure. I think Fender should make it more clear if 16 ohm would do damage to the amp . I have a 4x12 cabinet I would love to run it through but sure of the effect it will have on amp . That is one thing I regret about this amp . My 4x12 cabinet is 4 ohm or 16 ohm and I'm scared I would do damage to amp with 16 ohm load .


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Post subject: Re: 16 ohm cab for Super Champ x2
Posted: Fri Mar 25, 2016 9:03 pm
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Okay just spoke to Fender about adding another SC112 cab to my SC112 I have now to my Super Camp X2, now i know when you daisy chain two 8ohm cab togeather you will get 4ohm output. They told me that the head would not have a problem runnig 4ohms but don't run 16ohms this would cause problems. So If you switch the cab to 4ohms plug in a jack and use ohm meter on other end of jack to make shure that your just getting 4 ohms output before plugging ito head.


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Post subject: Re: 16 ohm cab for Super Champ x2
Posted: Mon Mar 28, 2016 5:24 am
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If you daisy chain two 8 ohm cabinets, you'll have 16 ohms, not 4. Connecting them in parallel will give you 4 ohms.


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Post subject: Re: 16 ohm cab for Super Champ x2
Posted: Wed Mar 30, 2016 9:20 am
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Ok maybe I'm wrong, now I thought most speaker cabs are wired inparallel in the cab like a SC112. Now useing a Y adapter to run 2 cabs depends on where you put the Y adapter at correct ? If you put the Y adapter at the output of the amp and run 2 seperate cords to each speaker, what ohms would you have for each speaker and what are the ohms at the head ? If you run a cable to head then to the Y adapter connected to the cab 1 and run a cable to cab 2, what would be the ohm output going to the head be ? Thank You


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Post subject: Re: 16 ohm cab for Super Champ x2
Posted: Wed Mar 30, 2016 12:07 pm
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With a Y adapter, the cabinets will be in parallel. Let's call the two terminals on a speaker cabinet A and B. If you connect the amp to the first cabinet's A, then first cabinet's B to second cabinet's A, then second cabinet's B to the amp, then the speakers are in series (daisy chained) and the total resistance is the sum of the two. If you connect both cabinet's A together and to the amp, and both cabinet's B together and to the amp, the cabinets are in parallel. Assuming each cabinet is 8 ohms, a series connection would give you 16 ohms, A parallel connection would give you 4 ohms.

Unfortunately, I don't know if 4 ohms or 16 ohms is harmful to a Super Champ or not.


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Post subject: Re: 16 ohm cab for Super Champ x2
Posted: Wed Mar 30, 2016 1:23 pm
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Called Fender back, the first time I called they told me that 4ohms is okay but don't go any lower than 4ohms.
Today I called to ask the same question, and this guy wasen't shure, but it's ratted at 8ohms and that is what you should use. I guess he didn't whant to put his foot in his mouth. but I've been using my Roland XL which is 80 watts and it has ext speaker output which I've been useing Fender SC112 which is 8ohms 80 Watts max as a second 12inch cab and had no problems whith it. I love the sound of 2x12 and at age 63 it's puts all of the adjustment for the amp at the perfect eye level. You don't have to bend down in beetween songs to make any adjustments. Now that I love the sound of my Super Champ with the tubes it makes alot of difference. Now that I have 2 SC112 8ohms, 80 watt max each. I wanted to use 1 cab for small venues and both for larger ones. Does anybody know which method to use that would put less stress on the head as far as ohms, should they be daisy chained togeather or should I put the Y adapter at the amp and run seperat cables to each speaker cab. I've thought of changeing the speakers 16ohm ones but then I'm in the same boat if I only want to use 1 cab for smaller jobs. I Thank You for any help


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Post subject: Re: 16 ohm cab for Super Champ x2
Posted: Wed Mar 30, 2016 2:44 pm
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I was just reading some older posts on thegearpage web site about speaker load mismatches on amps and the effects. From what I'm reading, on several posts, with a tube amp you're safe to go from one half to double the ideal amp load. So, for the Super Champ's 8 ohm output, you should be safe from 4 ohms to 16 ohms. The posts stated that it's safer, with a tube amp, to go with a lower impedance than with a higher impedance. So, the 4 ohm load should put less stress on the output transformer than a 16 ohm load. On solid state amps, the higher speaker load would put less stress on the amp.

So, you should be ok connecting the speaker cabinets in parallel, for a 4 ohm load. But, I'm no expert. Just a bored guy with Google.


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Post subject: Re: 16 ohm cab for Super Champ x2
Posted: Wed Mar 30, 2016 8:04 pm
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You know I've read some of the same threads, infact they refered Fender Black Face amps as being one of the better ones that can handel this without a problem. I remember when I first started playing as a youngster having a couple fender tube amps, back then we where trying to hook up as many cabs as possible to look cooler.
Didn't even worry about ohms everything was 8ohms. The problem back then was affording the tubes when you weren't old enough to have a job yet. Then they came out with tubles amps and I've been using them ever since.
My favorite thus far was my Roland XL 80 which has an ext speaker output and I've been using a Fender SC112
8ohm 80 watts output and I've been useing them together for quite a few years now. That was another thing I reading onthe threads, that most amps that have a second speaker out are just wired in parelle. Anyways I was hopeing to get confirmation on this from someone who has done this, or knows proffesionally the answswer.
But I love the sound out of my Super Champ tube amp and didn't know what I was missing . I thank You for taking the time to look for answers for me, and letting me know what you found. Maybe I'm posting this question in the wrong place, if someone could let me know.


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Post subject: Re: 16 ohm cab for Super Champ x2
Posted: Thu Mar 31, 2016 5:41 am
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Yeah, I was also a kid back in the Fender black-face days. Had a Pro-Reverb back then. I also connected external cabinets with little care about the ohms. Swapped out power tubes not knowing that biasing even existed. Actually, I read somewhere that the circuit designs back then were more tolerant of biasing or didn't need rebiasing. I'm sure output transformers, etc. were more robust than today - just from a cost standpoint.

I had tube amps until I stopped playing electric, almost a 30 year break. Solid state amps back then were pretty poor. When I took guitar up again, I picked up a Fender Mustang 1 amp. I was (and still am) very, very impressed at what a $100 amp will do today. Being rather old school, .when I saw the Super Champ with tubes and modeling, I just had to get one. No regrets!


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Post subject: Re: 16 ohm cab for Super Champ x2
Posted: Thu Mar 31, 2016 12:02 pm
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Let me ask a question, I just puchased my Super Champ from MF and it didn't come with a USB cable. I called them and they told me they would ship one. Today I recieved an email saying the manual dosen't say anything about supplying one. Now I've purchased the Mustang III and IV and they both came with the USB cable to hook up to fuse. I'ts not that I can't afford a $3 cable It's just that when you recieve the amp you wan't to hook it up and try everything. Can anybody verify this Thank You


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Post subject: Re: 16 ohm cab for Super Champ x2
Posted: Thu Mar 31, 2016 1:58 pm
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I bought my Mustang 1 used, no cable was with it. There may have been when it was new. I bought my SCX2 new from MF, and it didn't come with a cable. There was a "what's included in this box" label somewhere, and it didn't list a USB cable.


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