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Mark Bass CMD JB Players School Combo Review

I noticed that many have had questions about these combos based upon their price range and whether or not they have the capability to hold up in a full band/gig setting.
Also, I haven't seen an official review for the combo so I'll post my thoughts:

I bought my JB Players School combo used from GC last week. The original owner bought it and then swapped over for the actual Jeff Berlin signature combo. Not a bad choice but as I don't have $900+ to spend right now, the $350 used price tag caught my eye pretty quickly.
I used to run a Mark Bass LMII into an Eden 110 and a Peavey Tour 210. It was a really good set up and I regret ever deciding to move from MB to Ampeg. I got rid of my PF350 and the Tour 210 to get the JB combo.

At first glance, the amp and cab look good. Pulling it out of the box was hilarious. At 34.6 lbs it's easy enough to pick up and manhandle and really not feel like you're doing any work. I'm not sure anyone else can say they have a 1x15 combo that's as portable as the MB stuff.
A fun note: If you like this amp but aren't a huge fan of that big "Players School" sticker on the top left of the speaker grill, don't worry, it's just a sticker and peels right off for what, I think, is a more professional look.

As most of this forum probably knows, MB combos are generally just a stock MB head placed into a nifty package with a stock cabinet option and sold at a different price range.
This combo is no different as it's essentially the Little Mark 250 Black Line head coupled to a 151P cabinet without the tweeter.
The 250 Black Line will put out 150W @ 8 ohms and 250W @ 4 ohms.
The combo is set up to push the 150 W through the 1x15 cab.
It has the standard MB EQ knobs for Low, Mid Low, Mid High, and High. It also carries the VLE and VPF tone controls for shaping and contour, as well as Gain, Master and Line Out volume controls, and a balanced XLR port.

On the back of the combo there are two speaker outs. Conveniently, the head can be easily disconnected from the cabinet so you can run out to a different cab or run them in parallel.

Now for the real stuff.

Alone, it has more than enough power at 150W to hold up in a medium rehearsal setting. I can easily cut through an acoustic, an electric, drums and a keyboard and not feel like I'm over playing or pushing the amp too hard. Thus far, I haven't had to go any farther than 2 o'clock on the gain or master volume.

I will say that the VLE control should be avoided by anybody who hates losing their highs in an ensemble setting. Any kind of use of that filter totally destroys the treble characteristics of my two Jazz basses. The VPF would be of much more use to me if it didn't cut the mids. I'd rather have a mid/high boost than a low/high, but the rest of the amp totally outweighs that minor issue. I mostly just leave them off altogether.

In a gig or "full out" rehearsal setting I've run the combo through an Ampeg BXT210M cabinet.
The 210 will handle 400W @ 4 ohms so I never run a risk of the amp overloading the cab.
The full 250W that the Black Line head will produce can hang with any medium sized gig setting.
At a noisy restaurant/bar for an open mic night and an outdoor gig I never felt like I was getting lost.
The combo by itself at 150W can't produce in those settings though. If you're going to run it alone it would be best suited to acoustic or quieter settings. Think "MTV Unplugged" or something like that.

So, in short:

Looks: 10/10, not sure what else to give it. I think they're some of the most professional looking setups out there right now.

Features: 8/10, I've never been a huge fan of the VLE/VPF filters and it's purely personal opinion. I love that it has the XLR and easy to use speaker outs though. Could do with a mute switch also.

Quality: NR My particular combo had been rehearsed with and gigged at least once before I got it and it looks brand new. So kudos to the original owner and to MB for making a product that stands up to the rigors of actual use. Also, thus far I haven't had any issues with anything breaking. So hooray.

Sound: 9/10 Mark Bass produces yet another transparent combo that showcases you and your instruments more than it shows its brand name off. I love that I hear my basses and my playing style more than I have to worry about the amp getting in the way. I think that's why I'll be sticking with MB for a long while. The VLE and VPF are my only downsides to the sound.

Overall: 9/10


What are y'all's thoughts on this combo?
And feel free to ask any questions.

Thanks!
 
I've had mine several months now,I love the sound and the weight.So far haven't needed more volume but it's nice to know an 8 ohm extension speaker would almost double the power.I also have an Ampeg BA-115 combo w/a tweeter but don't miss the tweeter at all w/my Markbass,I think my Ampeg uses a piezo and my cynical opinion is most tweeters,especially piezos are just a marketing gimmick-"brand A has a tweeter,brand B doesn't-brand A must be better!" I also haven't moved my Ampeg since I've picked my Markbass up,the weight difference is remarkable!
 
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Nice reviews. Yeah, I picked a CMD JB Players School (mfg date 09-2014) at GC earlier this month for $249.99. Really can't beat the Sound for that price. Played gigs with it since and fellow musicians have remarked they dig the sound.
 
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In a gig or "full out" rehearsal setting I've run the combo through an Ampeg BXT210M cabinet.
The 210 will handle 400W @ 4 ohms so I never run a risk of the amp overloading the cab.
The full 250W that the Black Line head will produce can hang with any medium sized gig setting.
At a noisy restaurant/bar for an open mic night and an outdoor gig I never felt like I was getting lost.
The combo by itself at 150W can't produce in those settings though. If you're going to run it alone it would be best suited to acoustic or quieter settings. Think "MTV Unplugged" or something like that.

Thanks for this review. I love mine and I'm thinking about a) whether an upcoming outdoor gig will need more than this amp can produce; and b) whether I can get away with adding a 2x12 4Ω cab instead of upgrading to something like a MB Mini CMD 121P which delivers 400W and is designed to pair with a second 12" MB cab like the MB New York 121.

What's perplexing me is this. Say you've got the JB Players School amp by itself producing as much sound as it can in an outdoor gig. That's 150W at 8Ω. The cab can handle more, but that's as much as the amp can deliver. How does adding a 4Ω cab to this rig produce any more sound?
 
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Thanks for this review. I love mine and I'm thinking about a) whether an upcoming outdoor gig will need more than this amp can produce; and b) whether I can get away with adding a 2x12 4Ω cab instead of upgrading to something like a MB Mini CMD 121P which delivers 400W and is designed to pair with a second 12" MB cab like the MB New York 121.

What's perplexing me is this. Say you've got the JB Players School amp by itself producing as much sound as it can in an outdoor gig. That's 150W at 8Ω. The cab can handle more, but that's as much as the amp can deliver. How does adding a 4Ω cab to this rig produce any more sound?

This thread is very helpful and worth perusing - Ohms FAQ
 
Oh hey lookie here. From the MB FAQ:

You can use two 8 ohm cabinets with any Markbass head. The total ohm load then becomes 4 ohms, which means that you get more power from the amp. But be warned, you can't use Markbass amps into an ohm load lower than 4. That means you cannot use two 4 ohm cabinets, or one 4 ohm and one 8 ohm! There are two speaker outputs on every Markbass head. Simply connect one output to each cabinet. Be warned that using your amp into an ohm load lower than 4 ohms will damage your amp and will not be covered under warranty!

So adding an 8 ohm cab even to this combo seems like a good concept.
 
I don't know if anyone is still following this thread but is there any way to remove the head from the casing? I have a problem with my cooling fan and I'm trying to figure out how to remove the head in order to inspect it.
 
I don't know if anyone is still following this thread but is there any way to remove the head from the casing? I have a problem with my cooling fan and I'm trying to figure out how to remove the head in order to inspect it.

There's 4 screws (you'll need an allen key) on the back of the combo.
I've been tempted to take mine out and have it sitting on top of the cabs (I've got the combo and a NY151 cab).
I just haven't got around to it...but I did try it briefly earlier after seeing your other post... it's a very tight fit to even shift it a bit. I imagine once it's moved a little it'd free up.
Good luck with sorting out the issue - hopefully it's nothing too major.
 
It is a very snug fit, I'm assuming there is a certain way to work in out of the casing but its definitely not easy. Because of the way the amp is setup on the back it can only slide out about halfway, the head itself is way too wide to go the other way anyways. Hmm I wish there was more info on the web about this specific thing. I know there are people who have done this before, I"m thinking I just need to clean mine but we will see. I'm going to work on it.
 
Just an update... I was able to remove the head by sliding it out of the front of the casing. I used an air compressor and got the dust out from the fan and the rest of the head. No more fan noise! (:
But now I am working on a project making a top for the blackline 250 in order to use it separately as a real head, I am tired of jamming cables in the back of the tiny space behind the head when mounted. Seeing as I run a Traveler 102p in conjunction with the 1X15.
 
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Just an update... I was able to remove the head by sliding it out of the front of the casing. I used an air compressor and got the dust out from the fan and the rest of the head. No more fan noise! :)
But now I am working on a project making a top for the blackline 250 in order to use it separately as a real head, I am tired of jamming cables in the back of the tiny space behind the head when mounted. Seeing as I run a Traveler 102p in conjunction with the 1X15.

Glad you got rid of that noise.
Keep us updated on how that 'top' project works out. I'd be interested in trying that myself.
 
It worked perfectly! I was able to use an old thin piece of sheet metal and cut it to size with a heavy duty pair of scissors, cut the screw holes to match the ones used to connect the head to the cabinet and then just spray paint the top of the sheet metal black to match. It wasn't perfect but I also bought a small Markbass amp bag off of musicians friend and now it doesn't even need to come out of the amp bag in order to be used. Overall, the project was a success. I also had to buy a 1/4" by 1/4" extender in order to reconnect the head to the 1x15 cab seeing as the cord coming from the cabinet itself is only long enough to reach the head when it is inside the casing. But so far so good! Looks a lot more presentable now and makes for much easier access to the amp head.
 
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Hopefully, this post is still operating. I recently bought the Little Mark 250 Black Line. I play worship band music at a small 100-150 person church. But if I want to play classic rock/rock gigs at a coffeehouse or small club, would I be better off with a 2x10 cab or 2x12 cab with a guitarist, drummer, and two vocalists? And I guess 8 ohm is what I need to get the full 250 watts? I want to be modular with my equipment. The weight of the 2x10 Traveler is intriguing!
 
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