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Post subject: Mustang 1 open back
Posted: Sun Apr 07, 2013 10:27 am
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I opened the back of my Mustang 1. I think it sounds better open. I cut the back and replaced the top and bottom saving the middle section so that I can replace it in the future if need be. I painted the inside with some black paint I had kicking around. The whole job took about an hour. I unscrewed the back and tried it open before I started cutting. Here are a few pics
Image
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Post subject: Re: Mustang 1 open back
Posted: Sun Apr 07, 2013 12:52 pm
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Aspiring Musician
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That looks neat. I'm not sure why Fender did not make the M1 and M2 as open back in the first place (like the champ). I can think only of two reasons:

-a closed back permits to have a more flimsy cabinet overall (cheaper)
-or maybe, is to protect the speaker. It is my understanding that a speaker with a closed back will have some cushioning from ther air in the back, permitting it to be driven without damage to a greater wattage than the same speaker inside an open back. But i'm not sure about this one, altough it makes sense to me :)

Anyway,I prefer open backs as they rumble less and make the sound less directional overall.

good job!


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Post subject: Re: Mustang 1 open back
Posted: Sun Apr 07, 2013 12:55 pm
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Aspiring Musician
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another thing, it looks as if you could replace the 8" speaker by a 10"? that would be a good improvement for this little amp I think. I'm partial to 10" and bigger speakers for guitars... :roll:


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Post subject: Re: Mustang 1 open back
Posted: Sun Apr 07, 2013 2:08 pm
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I have thought about a 10 inch speaker, it will fit. One thing I have to figure out is if I would put a new speaker in do I have to use the crossover as I think there is one on the stock speaker. Any body know the answer? A better option is to put a closed jack in the case to use a speaker cab. I think this is the better option and believe I will try it soon.


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Post subject: Re: Mustang 1 open back
Posted: Sun Apr 07, 2013 2:36 pm
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Location: Crete
I also did experiments with Open Back MI and MII. After a while I found that with the stock speakers the original closed configuration is the best and most versatile. So I closed them again. The closed back gives a lot (sometimes too much) bass power, but some modells take an advantage of this. For the others you easier put lower the setting of the bass-controll of your presets.

The idea of giving a 10" to the M1 is great, there is really space enough. And then - depending of the character of the speaker - an open back could make sense. Sure I will give this a try when I get a appropriate speaker - what is not too easy in Greece.
Overall I am very happy with the tone of the M1 and I wont cut a 10" hole for testing purposes, but test the 10" in an external cab of same size.


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Post subject: Re: Mustang 1 open back
Posted: Sat Jan 26, 2019 7:29 pm
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Hi, I am an old electronic engineer and a guitarist fascinated by the new trend of simulating valves amps and vintage sounds. I have different valve amps, but I bought a Mustang I because it is amazing for moving around, teaching guitar, etc. I love it! Great sound.

I see that the concept developed by the Fender DSP team is misinterpreted. So I decided to participate to this discussion: the principle of the simulation is that a digital algorithm reproduce the sound of different amps and cabinet on a chosen speaker. In principle the speaker should be as linear (HiFi) as possible. If the speaker has a character it should be considered by the algorithm and compensated. See Kemper simulation that consider all the chain of amp + cabinet to acquire the parameters of a custom simulation. Now, in a nutshell, if you change the speaker you affect the simulation as intended by the engineers of the Fender DSP R&D department. If you open the back you change as well the result. I am not saying that the sound is going to be bad or affected in a negative way. May be you will like it more, but it is going to be different from the intended simulation.

Now, I decided to modify my Mustang I adding the possibility to connect an external speaker (cabinet). The power amp inside the Mustang should not be overloaded with 4 ohm speaker and so I bypassed the internal speaker when the ext cabinet is connected. I connect a very flat 8 ohm cabinet, model: BareFaced Big Baby. The sound is different (naturally), but because the high efficiency and the flat response the result is interesting. The problem I face now is this: when the Mustang use the internal speaker I have a result, when I connect the ext cabinet I have a different result. So I had to setup different preset to have the same result. Actually, if you connect the phone output directly to a mixer or to a DAW, you have the same problem. So, in my opinion, the flattest is the speaker, the better it is for me.

The original speaker of the Mustang I v.2 is 8" and you have to push on the bass control to go closer to the original amps. If you use the headphone you have a lot more bass with the same preset!

I like the fact that the Mustang is PORTABLE. I think the model one V.2 is amazing as it is. So I decided to improve the sound just adding rock-whole inside the Mustang, having an absorbing closed cabinet, instead of an open. If you are interested in more efficient and larger speaker, to improve the bass response and the volume, I would suggest to go with a neodymium 9" or 10" speaker, may be an extended range as flat as possible. This way you can control the simulation with the algorithm (Fender Fuse program) without overlapping the character of the speaker. It is not easy to enlarge the hole to accomodate a larger speaker, by the way! But if you love Mustangs and the work and cost of a good speaker are not relevant to you, let us know what was the result please.

Again, this are personal consideration, I am not saying that if you open the back and replace the speaker with a vintage one the sound will be not good.

Ciao!


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Post subject: Re: Mustang 1 open back
Posted: Sat Feb 09, 2019 8:42 am
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Pietro your post was one of the best in this forum ever.

I think many people does not fully understand the intent behind modeling, hope your explenation will help someone understanding.

Grazie e ciao!

_________________
I love my Mustang!

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You can find all my Mustang tips here:
http://ridingthemustang.blogspot.it/
An Unofficial guide to Fender Mustang Effects here:
http://ridingthemustang.blogspot.it/p/unoffcial-guide-to-fender-mustang.html

USB Footswitch Opensource Project:

https://github.com/mordor74/mustang-raider


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Post subject: Re: Mustang 1 open back
Posted: Sat Feb 09, 2019 11:28 am
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Great post, Pietro, and nice links, mordor74!

Grazie e ciao!

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Marky

Remember the music is not in the guitar


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Post subject: Re: Mustang 1 open back
Posted: Wed Feb 20, 2019 4:43 am
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Joined: Mon Apr 10, 2017 2:19 pm
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Pietro PG wrote:
Hi, I am an old electronic engineer and a guitarist fascinated by the new trend of simulating valves amps and vintage sounds...

...It is not easy to enlarge the hole to accomodate a larger speaker, by the way!

Ciao!

Thanks for the good info. An easy way to cut the hole without
a power jigsaw, is to draw the size of the new hole, drill holes
with a 1/4" bit around the inner perimeter of the drawing, yeah,
lots of holes, but tap the piece out, wrap a section of 3 or 4 inch
pipe with 60 or 80 grit sand paper, and smooth off the nubs,
and then enjoy mounting your speaker.

If you have, or can borrow a powered jigsaw, drill four holes
on the inner perimeter of the line so you can insert the blade, and make the cut.
Practice on scrap wood same type/thickness,
if you've not used a jigsaw before. Go slow, press down lightly
on the saw so it doesn't shake, but don't apply too much forward pressure
on the blade. Let it walk through the cut.
Cheers


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