Question 1

Can you get a travel bag/case for this expensive little guy?

Accepted Answer

I've looked for one also, including their website, and haven't found one. Mosisio has a camera case that looks like it will work ($30.99 on Amazon). I have it in my cart but haven't purchased yet.

Question 2

How does the mini differ from the larger 40W one (besides the 10 vs 40W power)?

Accepted Answer

I do not have a lot of experience with the Spark 40, just a quick demo that was impressive, I admit. So aside from the obvious power difference :) the reason I chose the Mini was because of how truly small it really is, less than half the size of the Spark 40 and considerably lighter. Also a major factor for me is that I already have an excellent small combo amp ( 1960's Fender Champ) so I was looking for a very, very small amp to partner with my Yamaha SLG 200N when getting together with friends. Literally something I could toss in a bag and throw over my shoulder, or take camping.  The Yamaha and the Spark Mini are a great combination! It sounds far better than you would expect from such a small amp, and with their app, is very versatile. I have also played my Tele and bass through it with very good results. But always keep in mind that this is all relative to its size! It cannot defy the laws of physics (though it takes a good stab.)
Then there is price. When I bought my mini it sold for $200 (USD) which was a consideration. It is pricey but IMHO when compared to other tiny amps, there is the Spark Mini, and the rest. (Note: There is also a very small amp that sells for about $100 that is pretty d@#$n good. Not on the same level as the Mini, but if your budget is limited (and haven't we all been there!) it's more than worth a look.
Hope this helps.

Question 3

I'm ignorant and would appreciate help. Would this work well with an acoustic guitar or is the app overkill and 'wasted'? Thanks.

Accepted Answer

Okay.... I am assuming your acoustic guitar has a built in pick up, or you are using an accessory pick up. Either way is good. This little amp works extremely well with my Yamaha SLG200N, Fender Telecaster, etc. It even works (sort of) with a bass. The app is quite good, though it does take a bit to learn to navigate it. It certainly is not overkill. Kept within its limits, the Positive Grid Spark Mini is an astounding performer. Much better than you would expect. Do keep in mind that it is a tiny 10 watt extremely portable amp. Could you gig with it at your local Starbucks? Yes. But much beyond that... 
As good as this little thing is, it cannot defy the laws of physics.
But it comes really close.
Hope this helps.

Question 4

Does this come with the optional crimson grille?

Accepted Answer

Mine did, but I got it in a promotional deal. I think you have to buy it separately now.

Enclosure Material	Battery
Color	Black
Compatible Devices	Guitar
Output Wattage	10 Watts
Connector Type	3.5mm Jack
Amplifier Type	Digital Modeling
Power Source	Battery Powered
Speaker Size	14.63 Centimeters
Output Channel Quantity	1
Item Weight	3.7 Pounds
Item Dimensions D x W x H	5.76"D x 4.84"W x 6.49"H

Positive Grid Spark MINI Guitar Amplifier, Portable Mini Amplifier for Electric Guitar, Bass and Acoustic Guitar 10W (Black)

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