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PJB: Briefcase vs. Bass Cub by Jonathan Moody

PJB: Briefcase vs. Bass Cub by Jonathan Moody… It’s one of those problems I like having; which amp do I take to the gig? It’s usually pretty easy, and comes down to the big rig or the little one. Since October, that little rig choice has gotten harder.

I’ve been using the Phil Jones Bass Briefcase for a couple of years now, and love it. Simply put, it’s the amp I wish I had purchased far earlier than I did. But out of curiosity I bought the PJB Bass Cub in October, thinking it was just a smaller, lighter updated version of my beloved Briefcase. What I found out was that the Cub is a completely different amp with its own sound.

I’ve included the specs below. As you can see, there are are some similarities between the two. Both have active/passive inputs, headphone outs, DI, a limiter and are both rated at 100W. However, that’s where it ends, as I’ve found that both are very good at different things and applications.

Model Bass Cub BG-100
Type Lightweight bass combo
Size 7.8 x 12 x 10.8 inch (H x W x D)
Net Weight 13.2 lbs / 6 kg
Power output 100W RMS
Speakers 2 x PJB NeoPower Type A
Channels 2
EQ 3 band, limiter
Inputs Active/passive, AUX, Mic
Outputs Headphone, DI, Pre-amp

Model Briefcase
Type Practice/studio combo with battery power option
Size 15.5 x 6.7 x 17.3 inch (H x W x D)
Net Weight 30 lbs/14 kg
Power output 100W RMS
Speakers 2 x PJB Piranha Type B
Channels 1
EQ 5 band, limiter
Inputs Active/passive
Outputs Headphone, DI, Pre-amp

First the Cub. One advantage that the Cub has is the fact that it’s so light, you can carry it into a gig over your shoulder; the bag that comes with it facilitates this nicely. You can also pick how you want to set the amp up; it has feet for vertical or horizontal placement and even has a stand to allow you to tilt the amp up in the horizontal position. I have used this amp for a couple of theatre runs already, and have mainly used it in the vertical position. However, you can use it in the horizontal position and slide it under your chair, which for a very tightly cramped pit may come in handy.

The Cub also has two channels, perfect for those of us that double on electric and upright, or in my case, upright and ukulele. With channel one accepting an XLR in, this amp is also suitable for those upright bassists that use a microphone in addition to a pickup to get their sound. The one downside is that you cannot switch between channels; they’re both always on (although the second channel does have a “mute” function). Not a big deal for when you’re using two instruments that have volume knobs, but since my ukulele doesn’t, I have to turn the volume down on the amp instead of being able to leave it set when not using it.

The biggest difference I noticed are the speakers. The Bass Cub uses the newer PJB NeoPower drivers, and they are quite a bit different from the PJB Piranhas that I’m used to. The sound is more mellow and natural, and not as hi-fi sounding. The clarity and definition is still there, but does not have that sparkle that the Piranhas are known for. I’d say the NeoPower drivers are what a “traditional” speaker sounds like in the PJB world. I’ve found that I prefer the Neos for when I’m using my NS Design CR-5M electric upright. It brings a warmth to the instrument that makes it sound more authentic (or, as authentic as you’re going to get). I bought the Cub out for a theatre run of “White Christmas,” and the sound of the Neos really helped me sit in the mix better than I think the Piranhas would have. I’m currently using the Cub for a run of “The Last Five Years,” where I’m playing my Warwick Corvette $$ fretless next to an acoustic guitar and three string players. Again, the warmth that the Neos have over the Piranhas is perfect for this application, allowing me to sit in the mix and not on it.

While the Bass Cub has a lot of great features, the Briefcase is one amp that should not be discounted in the slightest. It’s an older, more well-known model in the PJB line. It does only have one channel (doublers would need an A/B pedal to utilize this amp effectively) and it much heavier at 30 pounds. The Briefcase has a 5 band EQ over the Cub’s 3, which I find to be more powerful to help shape my overall sound. Little moves in one of the sliders make a very large and definite tonal shift.

Probably the coolest feature of the Briefcase is that it has the option of being battery powered. I’ve never had the need for this feature (or the time to grab a battery for it), but it’s a brilliant option for those musicians that are busking on a street corner or at a spot where power may not be readily available (I’ve had gigs at folk festivals where I’ve wondered about the safety of those extension cords running through the grass).

The sound that many people (as well as myself) attribute as “the Phil Jones Bass sound” comes down to the Piranha drivers in the Briefcase. These are very tight and punchy, while retaining a very clear and focused lower end. They are extremely articulate and precise, while still letting the distinct sound of your bass come through. I prefer using this amp when I’m doing theatre runs that require an electric bass. The sound is so clear that I can keep the amp at a low volume, and it will cut through the entire pit, allowing me to anchor the show.

The Bass Cub and Briefcase from Phil Jones Bass bring a lot of similar features to the table, while still offering something unique that makes each of these small amps perfect for different situations.

Bass Cub:
Lightweight, easy to carry over the shoulder into a gig
2 channels make doubling easy
Neo speakers bring warmth and more traditional, mellow bass sound
Ideal for situations using acoustic instruments or for more laid back gigs

Very intuitive and powerful 5 band EQ
Battery powered option, perfect for busking in the summer
Piranha speakers have a brilliant hi-fi sound, perfect for cutting through
Ideal for situations involving electric bass, or anything where that
hi-fi sheen is required/appreciated

For me, the tonal needs and goals of the group I’m playing in will determine which amp gets the call. With either, I still get the transparency and reliability that PJB amps are known for, allowing my bass to sound its best, no matter the gig.



  1. Pingback: BMM: PJB Briefcase vs. Bass Cub » Jon Moody, freelance bassist and ukulele player, staff writer for Bass Musician Magazine

  2. Cory Grossman

    November 30, 2012 at 6:52 am

    Thanks so much for this article, Jonathan! This was exactly the information I was looking for, as a cellist and bassist. The majority of my gigs are acoustic where I just need a 50-150% bump, and the rest of the time I just need my own stage monitor, so I think the cub should be perfect. What a hard choice though!

  3. Mag

    March 18, 2014 at 10:34 pm

    I think the briefcase does have it’s own sound, not really just the sound of your bass. The double four,however is clearer to me with more highs and is closer to that “just the sound of your bass” goal,and, it can be powered by a battery-yikes,yes!

  4. David Anderson

    March 19, 2014 at 7:10 pm

    I am now using the Double Four for rehearsals and I have one of the demo Briefcase Ultimates from NAMM. The main thing about the Double Four and the Briefcase Ultimate is the passive radiators at the back. They add tons of warm bottom to both amps, and act as a shock absorber so that the speaker cones cannot overextend. The Double Four has two discrete power amps for added damping. The new 160-watt Briefcase Ultimate has new 5″ Piranha speakers and they continue the traditional sound of the original Briefcase, only way louder. Passive radiators–the only way to go.

  5. Jonathan Moody

    Jonathan Moody

    March 20, 2014 at 8:43 am

    Mag, I’d actually disagree a bit with you, having used the Double Four for a couple of months of gigging at this point. I would put the Double Four as a good “middle ground” between the Briefcase and the Bass Cub, as it shares a lot of the characteristics of both amplifiers. However, doing a lot of gigs where my means of amplification is a DI into FOH, I still find the Briefcase has a clearer, more “my bass sound, only louder” tone to it than the Double Four does. That said, I still love the Double Four, and use that instead of the Bass Cub nowadays when I need that sound.

  6. Jonathan Moody

    Jonathan Moody

    March 20, 2014 at 8:44 am

    David, I agree. The new passive radiator on the Double Four is quite amazing, and makes that little amp scream. I haven’t had a chance to try the Briefcase Ultimate, but I can only imagine how great it sounds with the new tech. Gotta love Phil Jones, and his endless quest for tonal nirvana!

  7. david anderson

    March 20, 2014 at 9:18 am

    I used to own a Mesa Walkabout combo with an unsuccessful application of the passive radiator technology. It has a down-firing radiator that fights with the floor! There are two genius aspects to the PJB radiators. One is the rear-firing position, so that you can adjust the bounce by how close to the back wall you put the amp. The other totally amazing achievement is the rectangular shape. It is easy to distribute acoustic stress across a round surface, but to do that with a rectangle is mind boggling.

  8. Pingback: PJB: Briefcase vs. Bass Cub by Jonathan Moody | Peter Williams

  9. Jacqueline Hayden

    August 4, 2014 at 8:13 am

    I own two PJ Briefcase amps, and love them. One stays at the church, the other goes to gigs, and camping. I carry my own equipment, hubby has had a stroke, so the 30# makes it easer on me. You can not go wrong with this amp. A little package, with a BIG PUNCH! I never used the battery option, but it is an awesome feature if needed.

  10. Jeff Windsor

    August 23, 2014 at 7:38 pm

    I use the Briefcase with battery, a Line 6 g30 wireless (powered by a battery pack) and a Kala U-Bass ukulele for a tremendous “acoustic” setup for outdoor jams sessions and street gigs. The amp can be inconspicuously positioned, and the wireless system makes it so you can’t really tell at first glance that the U-Bass is amplified. I couldn’t be happier (well, I *would* like an Ultimate Briefcase…).

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