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Topic: Modifying a Nashville 112 |
David Nugent
From:
Gum Spring, Va.
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Posted 14 Nov 2015 3:26 pm |
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| Considering modifying the headphone jack on my Nashville 112 to function as a speaker out so that I can run an extension cab. Plan on changing the internal speaker to a Telonics neo 8ohm and installing a second Telonics 8 in the cab. Is this a simple project or one best handled by a tech? |
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Lane Gray
From:
Topeka, KS
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Posted 14 Nov 2015 4:36 pm
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If there's room, I think I'd just drill a hole and add a parallel second jack, and leave the headphone jack alone.
_________________
2 pedal steels, a lapStrat, and an 8-string Dobro (and 3 ukes)
More amps than guitars, and not many effects |
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Len Amaral
From:
Rehoboth,MA 02769
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Posted 14 Nov 2015 7:02 pm
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| if you had a female Jack from the back board wired to the speaker then you could run a speaker cable to an extension cab. If both speakers are 8 ohms that would give you a 4 ohm load. No need to do anything to the chassis. |
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Lane Gray
From:
Topeka, KS
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Posted 14 Nov 2015 7:15 pm
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Better thinking than mine.
_________________
2 pedal steels, a lapStrat, and an 8-string Dobro (and 3 ukes)
More amps than guitars, and not many effects |
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Jim Palenscar
From:
Oceanside, Calif, USA
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Posted 14 Nov 2015 10:36 pm
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| If I recall correctly, plugging anything into the headphone jack of a 112 mutes the internal speaker so I'd vote in favor of Lane or Lenny's approach. |
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Quentin Hickey
From:
Nova Scotia, Canada
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Posted 15 Nov 2015 5:02 am
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| Its probably best if you split the wires going to the speakers off in parallel and solder on female 1/4 inch jacks. You can probably make up a bracket to mount it to inside the back of the speaker compartment. I would sooner do this way than mess around with the chassis and potetially make a mess. |
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David Nugent
From:
Gum Spring, Va.
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Posted 15 Nov 2015 5:20 am
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| That was the purpose of my question. Since the '112' is not equipped with a speaker out jack, thought perhaps the pre-existing head phone jack could be easily modified to transmit a full strength signal from the chassis without muting the internal speaker. May try Len's idea however, sounds much less complicated (should have thought of it myself!)..Thanks to all for the replies. |
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Tony Palmer
From:
St Augustine,FL
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Posted 15 Nov 2015 5:20 am
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I'm curious Dave. Why do you want an extension speaker with the 112?
If it's not a powered speaker you will only get half the power in each speaker...is it to
spread the sound over a wider range?
_________________
Sierra S10 (three!), Peavey 112 and 115, Benoit dobro, Beard Model E dobro, Beard Roadophonic, MSA Superslide, Dean Nickless custom dobro |
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David Nugent
From:
Gum Spring, Va.
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Posted 15 Nov 2015 8:37 am
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| Tony My intended purpose is to enable me to place the extension cab in closer proximity to me when monitor balance is an issue. |
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Tom Gorr
From:
Three Hills, Alberta
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Posted 15 Nov 2015 9:17 am
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What impedance is the original N112 speaker?
There should be some discussion of parallel vs. Series. ....
parallel is dead simple to wire up as Len suggests IF as he elaborates two 8 ohm speakers can be used .. but if the speakers are 4 ohms. .. parallel gets down into 2 ohms which probably could hurt the power amp.
If series is required the circuit will need some further thought. . perhaps a dpdt switch or a switching jack to allow a single speaker operation when the extension is not being used. |
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Ken Fox
From:
Nashville GA USA
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Posted 15 Nov 2015 11:17 am
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The internal speaker is 4 ohms already That is all the amp can handle. If you want to run two speakers then both must be 8 ohm for a total load of 4 ohms. Other wise you would have a two ohm load. You would get a 2.66 ohm load adding an 8 ohm to the internal 4 ohm. Not a good idea. Output transistor failure would likely result at loads lower than 4 ohms
The headphone jack is on a circuit board in the amp, not a real good idea to use that.
Last edited by Ken Fox on 15 Nov 2015 11:38 am; edited 1 time in total |
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Lane Gray
From:
Topeka, KS
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Posted 15 Nov 2015 11:27 am
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So use Len's idea, and run a pigtail to a female jack, probably mounted in the lower back panel?
Since people often put cables and stomp boxes down there, I'd suggest an enclosed jack.
_________________
2 pedal steels, a lapStrat, and an 8-string Dobro (and 3 ukes)
More amps than guitars, and not many effects |
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David Nugent
From:
Gum Spring, Va.
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Posted 15 Nov 2015 1:12 pm
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| Ken Fox..Thank you for answering my inquiry on using the headphone jack, that was the information that I was seeking..Was aware of the 0hm matching issue however, which is why I specified in my original post of my intent to utilize two 8 0hm Telonics speakers in place of the original 4 0hm Blue Marvel, thus maintaining the intended load...Thanks again. |
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Quentin Hickey
From:
Nova Scotia, Canada
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Posted 18 Nov 2015 4:06 pm
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| If it was me I would just buy another 112 and run a dual output volume pedal, they come by pretty reasonably priced here once in a while. |
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Lane Gray
From:
Topeka, KS
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Posted 19 Nov 2015 2:43 am
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A Goodrich 120 is a dual output pedal until you mess with it...
_________________
2 pedal steels, a lapStrat, and an 8-string Dobro (and 3 ukes)
More amps than guitars, and not many effects |
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Steve Spitz
From:
New Orleans, LA, USA
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Posted 19 Nov 2015 5:26 pm 2 NV 112s
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I really like the 2 NV 112 idea. You could get a fat stereo sound , and if you ever needed to sell one, it's easy to do.
I know that wasn't the OPs original question, but it sounds like a cool idea. |
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