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Post subject: Blues Jr. through a Marshall 4-12 cabinet
Posted: Wed Mar 10, 2010 6:04 am
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Yesterday in a post by Beaubs I said I'd try my Blues Jr. through my Marshall 1960 4-12 cab loaded with G25 12L Celestions and when I got up this morning the first thing I did was toddle downstairs to my music room and give it a go.I must say the experiment was a smashing success,you wouldn't think that it was the same amp.The Celestions really brought the character of the amp,on a clean setting(with my MIC Casino)it was as clear as a bell and actually had a chimey tone.When I turned the volume and master both halfway it had a lovely warm tone with just a tad of rawness. When I maxxed the volume and turned down the master is when it really shone,what an amazing sound,pure unaldulterated raunch with a real tasty crunch words can't describe the sound,it's that outstanding.I can see now why people are taking the innards out of BJs and building seperate heads for them,running them through an extension cab really brings out the tonal possibilities this amp is capable of.It would behove Fender to build a head only version of this little darling.I was wondering if I just put in a Vintage 30 if it would give me a better tone response than the Eminence that came with it as this is the 1st amp I've owned with an Eminence speaker.Suggestions?

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Last edited by guitslinger on Wed Mar 10, 2010 1:59 pm, edited 1 time in total.

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Posted: Wed Mar 10, 2010 8:00 am
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Everything is gonna’ sound better through a 4x12 . you are gonna get more low end and more air movement, its going to be an overall fuller sound. As far as changing the speaker in your combo that is up to you…I am a huge fan of the V30 but the Eminence speaker is very good as well.. I just don’t know how much difference it is going to make when you’re talking about only one speaker, you may notice some mid range difference depending on how loud you play the amp . I have played the Mesa dyne combos and a/b the black shadow Eminence speaker against the v 30 in the combs. There is not a lot of difference between the two but there is some, and I like the v 30 better. For whatever its worth if it were mine I probably change to the clestion but that’s me …Or you could run it through the 4x12 all the time :D

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Posted: Wed Mar 10, 2010 10:57 am
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The problem with the BJ is not the speaker in the cabinet it's the size and design of the cabinet. Small, light and portable may be great for loading gear but it's not great for tone. Through my 1X12 Rivera cabinet with a V30 my BJ sounds much, much better than through the stock cabinet. BTW, my BJ is also loaded with a V30. Now that I have done the same experiment I will be looking for a way to convert my BJ to a head unit.

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Posted: Wed Mar 10, 2010 12:00 pm
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Unfortunately the wood the Blues Jr cabinet is made of is part of the issue.
I am really surprised that more people have not done what I have and have a custom cabinet made for the Blues Jr chassis. Or make it into a head.

If you really don't want to go to that extreme I suggest a Scumback "M" model speaker.
I also suggest measuring the length and width of the reverb unit and then cutting a nice 3/4 inch thick piece of solid wood and mounting that to the inside of the amt cabinet where the reverb unit is currently mounted then mount the reverb unit to that piece of wood.

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Posted: Wed Mar 10, 2010 12:18 pm
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CAFeathers wrote:
Unfortunately the wood the Blues Jr cabinet is made of is part of the issue.
I am really surprised that more people have not done what I have and have a custom cabinet made for the Blues Jr chassis. Or make it into a head.

If you really don't want to go to that extreme I suggest a Scumback "M" model speaker.
I also suggest measuring the length and width of the reverb unit and then cutting a nice 3/4 inch thick piece of solid wood and mounting that to the inside of the amt cabinet where the reverb unit is currently mounted then mount the reverb unit to that piece of wood.



Chet…. I’m trying to see the method behind the madness of re-mounting the reverb unit to a separate piece of wood.. stronger connection with less extra vibration maybe?.....Please explain as you have certainly peaked my interest.


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Posted: Wed Mar 10, 2010 12:41 pm
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wtcumm00 wrote:
CAFeathers wrote:
Unfortunately the wood the Blues Jr cabinet is made of is part of the issue.
I am really surprised that more people have not done what I have and have a custom cabinet made for the Blues Jr chassis. Or make it into a head.

If you really don't want to go to that extreme I suggest a Scumback "M" model speaker.
I also suggest measuring the length and width of the reverb unit and then cutting a nice 3/4 inch thick piece of solid wood and mounting that to the inside of the amt cabinet where the reverb unit is currently mounted then mount the reverb unit to that piece of wood.



Chet…. I’m trying to see the method behind the madness of re-mounting the reverb unit to a separate piece of wood.. stronger connection with less extra vibration maybe?.....Please explain as you have certainly peaked my interest.


Bill


Let me see if I can explain this.

The cabinet of a Blues Jr is in essence particle board, a wood that is made from gluing and pressing sawdust/woodchips/etc. So it is not as solid as it could be. Since a reverb unit is springs that vibrate by putting it on a solid piece of wood you are giving it a harder surface to work with, thusly improving the vibrations.

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Posted: Wed Mar 10, 2010 2:14 pm
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BigJay wrote:
Nevin1985 wrote:
Interesting in theory, but seems pretty far fetched to me. I would have to hear it side by side.


Well, that description of the particle boards impact on vibration and its use in speaker cabinets is absolutely true. Im just associating that concept with what Chet was suggesting. I suspect that's where he was going with it.


Yes, Thank You for your input.

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Posted: Wed Mar 10, 2010 2:17 pm
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ahh ok that was kind of how I was picturing it…I did not in face know the BJ was particle board so that makes much more scene to me now.. what does not make scene to me is why you would ever use particle board in a combo amp where the speaker and sound vibrations would shake the thing apart over time…Ok in a head sure I guess but not a combo. I guess Fender want to keep it afforadable as they can…. Thanx Chet & BigJay…good looking out during my blond moment….LOL :oops:

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Posted: Wed Mar 10, 2010 3:02 pm
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BigJay wrote:
wtcumm00 wrote:
ahh ok that was kind of how I was picturing it…I did not in face know the BJ was particle board so that makes much more scene to me now.. what does not make scene to me is why you would ever use particle board in a combo amp where the speaker and sound vibrations would shake the thing apart over time…Ok in a head sure I guess but not a combo. I guess Fender want to keep it afforadable as they can…. Thanx Chet & BigJay…good looking out during my blond moment….LOL :oops:

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Are you suggesting your Blues,Jr. fell apart, the cabinet? That shouldnt happen (from playing it) unless its defective. Of course, shocks to the cabinet can weaken the construction and it will eventually fail, like if you drop it or bang it around a gear-truck going to gigs all the time. But it shouldnt just rattle apart from playing it.

The points behind particle board include 1) Cost as you've mentioned, but more importantly 2) its negligable influence on the transmitted sound. That's a benefit when you use high tech electronics to microtune to a specific sound. If you want really pure sound, exactly as its recorded or produced (from the guitar and processing), you use particle board because it wont influence the tone.

If you decide to produce a sound room, for example, and you want it top-notch, you might use particle boards on the walls, along with other acoustic panels, because it wont reflect adulterated sound back at the microphones.

So, its not a bad thing. It just an engineered design.



Makes scene to me it just struck me as odd.. I have 7 amps all made of cabinet grade birch plywood…I was just not aware particle board was widely used in amplifiers.. I know marshall new dsl cab is particle board to keep cost down . I don’t see how it makes a difference in a closed back cab…now in an open back I can see how you would want dampening and in that case a more sound absorbent material makes scene.
I was not suggesting the blues Jr would literally come apart; Just that it would be not as strong and have a better potential for damage from dropping, spills , over all longevity or what ever

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