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Post subject: SCX2 and impedence matching for ext cab 2x12
Posted: Wed Nov 13, 2013 11:23 pm
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Hey there Fender!

Long time watcher, first time poster!

Anyhow, I have myself a spanking new SCX2, and I also have at home a 2 x 12 cabinet rated at 16ohm (which is 2 x 12" 8ohm eminence speakers, wired parrallel, 80Watt each).

Reading the manual for the SCX2, it says, and I quote: "SPEAKER OUT—Connection for the internal speaker or an external speaker (8Ω/25W minimum)."

My questions are as follows:

1. Given the minimum spec listed in the manual, am I right to assume that running this 16ohm cabinet from the SXC2 will be fine for prolonged use?

2. If not, what are the risks?

3. Does this also apply to the SCXD (which has the same text in its manual)?

Cheers


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Post subject: Re: SCX2 and impedence matching for ext cab 2x12
Posted: Thu Nov 14, 2013 9:29 am
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8 ohm is the spec., so I would be careful and ask your local Fender repairman what he thinks, and in a bit Fender staff will let you know what they think in reply to your post. Personally I would only use an 8 OHM speaker for the SCX2 unless Fender says differently.

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Post subject: Re: SCX2 and impedence matching for ext cab 2x12
Posted: Thu Nov 14, 2013 5:28 pm
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Thanks desertbluesman,

My question is really about the strength of the word 'minimum' printed in the manuals, as it is a little vague and suggests that you can go higher than 8ohm/25W.

Sure 8ohm is always going to be the perfect match, but there are a number of posts all around the web (even on this SCX2 forum - yes I've looked, but nothing is clear) that say running 16ohm is ok, and others sticking to the matched impedence story.

There are a few small amps around running the same power tube config (2 x 6V6) that are rated to output to both 8 and 16ohm.

Just need to know what Fender mean by 'minimum', and what the risks are (if any) of connecting to a 16ohm load.

Im also thinking of purchasing a SCXD off a friend so want to know if the same applies for the XD.

If its going to kill my amp, than Ill probably mod my cab with a stereo(series)16ohm/mono 8ohm DPDT switch like marshall do.


Last edited by jlb138 on Thu Nov 14, 2013 8:04 pm, edited 1 time in total.

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Post subject: Re: SCX2 and impedence matching for ext cab 2x12
Posted: Thu Nov 14, 2013 7:52 pm
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jlb138 wrote:
Hey there Fender!


Anyhow, I have myself a spanking new SCX2, and I also have at home a 2 x 12 cabinet rated at 16ohm (which is 2 x 12" 8ohm eminence speakers, wired parrallel, 80Watt each).



If your two 8 ohm speakers are wired parallel, then your cabinet is 4 ohms, not 16 ohms.


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Post subject: Re: SCX2 and impedence matching for ext cab 2x12
Posted: Thu Nov 14, 2013 8:01 pm
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Thanks DavidRamey,

Well spotted - youre right, my bad :P - the cab is wired series 8ohm + 8ohm = 16ohm


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Post subject: Re: SCX2 and impedence matching for ext cab 2x12
Posted: Tue Nov 19, 2013 4:02 am
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Image

Image


In addition to the text in the manuals, the rear panels of the X2 and XD clearly showing '8ohm minimum'


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Post subject: Re: SCX2 and impedence matching for ext cab 2x12
Posted: Fri Nov 22, 2013 3:12 pm
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Dear Julian,



Thanks for your inquiry. Yes you can run an 16ohm speaker cabinet for both the Fender Super Champ® X2 and XD. You can go up in ohms not down because the lower ohms makes it have to work harder. Please let us know if we can assist further.



Regards,



Steven Jackson

Technology Support Lab

Fender Musical Instruments Corporation

17600 N. Perimeter Dr. Suite #100

Scottsdale, AZ 85255

Phone 480-596-7195

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Hi there,

I tried to get a response from you guys via the forum but its been well over a week with no response so I thought I'd just email you.

The forum thread is:

viewtopic.php?f=45&t=90332

Anyhow, I have myself a new SCX2, and I also have at home a 2 x 12 cabinet rated at 16ohm (which is 2 x 12" 8ohm eminence speakers, wired series, 80Watt each).

Reading the manual for the SCX2, it says, and I quote: "SPEAKER OUT—Connection for the internal speaker or an external speaker (8Ω/25W minimum)."

Also, looking at the speaker out on the rear of the unit, it says '8ohm min'

My questions are as follows:

1. Does '8ohm minimum' mean that users can run a 16ohm cabinet comfortably for prolonged use?

2. If not, what does 'minimum' refer to, and what are the risks if running a 16ohm cab?

3. Does this also apply to the SCXD (which has the same text in its manual and text on the unit itself)?


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Post subject: Re: SCX2 and impedence matching for ext cab 2x12
Posted: Wed Feb 12, 2014 6:27 pm
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This was a REALLY good question!

I have a Marshall 4 x 12 cab. Will it work through that cabinet as well, then?

And I guess I'm trying to figure out why more resistance makes the head work... less harder? why is that?


DA


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Post subject: Re: SCX2 and impedence matching for ext cab 2x12
Posted: Wed Feb 12, 2014 10:46 pm
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Dennis Alvey wrote:
This was a REALLY good question!

I have a Marshall 4 x 12 cab. Will it work through that cabinet as well, then?

And I guess I'm trying to figure out why more resistance makes the head work... less harder? why is that?


DA


8 or 16 ohm cab is good.

I am seriously thinking about getting a high quality OT (output transformer) to put into my SCX2. A quality OT can result in better tone and I want to get one with a 4 ohm tap. It will give the amp the robust versatility I would like it to have.

There are ones that are just drop in. They match the holes in the chassis.

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