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Trudeep Bass cabinets

STurner

Supporting Member
Jan 6, 2025
27
123
Wanted to give a quick shoutout to Tom Robotham at Trudeep Bass. ( For some contest, I am a relatively new bass player, but have been involved in music all my life at individual, band, and orchestra levels. After switching from guitar to bass a few years ago, I became hooked and currently play a custom Manne 6 string and a Sadowsky custom shop 6 string.)

Since starting to play bass, I have been on somewhat of a pursuit to find the tone and clarity of sound that I heard in my head along with a solid impactful bottom end to compliment the bass. After trying many amps, I settled on the Jad Freer Sisma playing either through the tube preamp or bypassing the preamp direct depending on the tone I wanted and Analysis plus cables. The story of trying different cabinets is a long one, but basically I tried and or owned a bunch including Bergantino, Ampeg, Aguilar, Barefaced, Phil Jones, Markbass, Mesa and a few others. While I liked some things about many of them and enjoyed playing several, there were always compromises in areas that I wished were different.

Then I found Trudeep Bass. I called and talked to Tom at length and decided to give the 9PM a try as a "practice" cab or small room cabinet to see how they were.

WOW! This cabinet is only about 11x12x16 with a 9" woofer and midrange and weighs 29lbs, but puts out unreal bottom end for such a small cabinet. The sound is very accurate, super tight and the bottom end extends way beyond what this size cabinet should be able to reproduce well. The only tradeoff that Tom had to make is that the sensitivity is not super high, but my Sisma has absolutely no issues driving it to where I want it volume wise.

Bottom line, this little cabinet caused me to sell 12" and 15" cabinets that I thought I would keep for a long time. Even comparing this tiny little cab to a very highly regarded 15" cabinet that I had, the low end was much tighter, punchier and even though the "flapping pants leg" effect was slightly less because of the smaller driver, I still preferred even the low end and certainly the tone of the 9PM over the 15" cab that I was using previously. I now have a 12AM cabinet on order from Tom and hope to get it in a month or two - they are not inexpensive cabinets at all, but if you are looking for the best bass cabinets that I have ever heard, I would give Tom a shout.
 

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I would not be surprised if the 9PM sounds great, but I would caution people in regards to how loud such a small, HiFi cab can play. Make sure your expectations are reasonable when buying, because these cabs are not claiming to break the rules of physics and play loud.

Here is the specs for the 9PM
1787674513645.webp


F3 of 49hz is relatively low for a 1x9 cab...but not particularly low for a bass cab.

The more important specs IMHO are the power rating and sensitivity.

Assuming 175W RMS can be handled to 49hz and sensitivity of 90dB 1W/1m, calculated SPL is 112.4dB, which IME is extremely limited for live music performance.

The Truedeep website suggests:
1787675188480.webp

I did the red underlining. Adding a second 9PM will give you +6dB/raising calculated SPL to 118.4dB if your amp can deliver 350W at 4ohms.

IME 118dB is usable for relatively low volume jazz gigs. For me it was borderline for most of the big band work I did.

For comparison the Acme Low B2 calculated SPL limits are almost the same as a pair of 9PMs. The Acme plays significantly lower with F6 of 31hz. I thought the Acme sounded great in big band but I had to play with restraint/limit my dynamic range to avoid clacking the woofers.
 
To address some of your comments -

- yes they are expensive and probably aren't for everyone. I know Tom is working on some things to help to lower the price.

- obviously, with a 90db sensitivity, they aren't designed to play just one in a large auditorium. But if you need that capability, you just go with a couple of 12's, or 15's which have a similar tone with greater sensitivity (loudness) and an even stronger bottom end.
 
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Your description sounds almost exactly what I would say about my GR Bass cabinets. The main difference being they are carbon fiber my 2x10 cabinet only weighs 18 lbs!
I played a GR cabinet, and while they are impressive for there size and weight, the tone of them is no where near the clarity and nuance of the Trudeep Bass cabinets. I felt like the GR cabinet was very "boxy" and constrained in comparison personally.
 
The Acoustic Image Doubleshot (RIP Rick Jones) is still probably the lightest 210 + 5 at 15lbs but I think the material is some kind of Epoxy reinforced Carboard - rated power at 4ohms is 600 watts.

BUT it's not really loud, the reason is low sensitivity . I think many small cabinets are like this and the DoubleShot is the most compact because of the opposing woofer design. In an acoustic context it does fill the room but I would not use it with a Rock Band. I tried and I had to crank my Clarus 650 watt amp. When I moved to a Hartke 410 that the other band had, it was like a grenade vs a BB gun.

I know folks are raving about Barefaced Cabs . I compared a 210 with the Mesa 210 Diag . Mesa is definitely louder at the same point on the master. I think liek basses, you have to test cabs and play them at gig levels. Specs and marketing material will never tell how they will perform
 
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Wanted to give a quick shoutout to Tom Robotham at Trudeep Bass. ( For some contest, I am a relatively new bass player, but have been involved in music all my life at individual, band, and orchestra levels. After switching from guitar to bass a few years ago, I became hooked and currently play a custom Manne 6 string and a Sadowsky custom shop 6 string.)

Since starting to play bass, I have been on somewhat of a pursuit to find the tone and clarity of sound that I heard in my head along with a solid impactful bottom end to compliment the bass. After trying many amps, I settled on the Jad Freer Sisma playing either through the tube preamp or bypassing the preamp direct depending on the tone I wanted and Analysis plus cables. The story of trying different cabinets is a long one, but basically I tried and or owned a bunch including Bergantino, Ampeg, Aguilar, Barefaced, Phil Jones, Markbass, Mesa and a few others. While I liked some things about many of them and enjoyed playing several, there were always compromises in areas that I wished were different.

Then I found Trudeep Bass. I called and talked to Tom at length and decided to give the 9PM a try as a "practice" cab or small room cabinet to see how they were.

WOW! This cabinet is only about 11x12x16 with a 9" woofer and midrange and weighs 29lbs, but puts out unreal bottom end for such a small cabinet. The sound is very accurate, super tight and the bottom end extends way beyond what this size cabinet should be able to reproduce well. The only tradeoff that Tom had to make is that the sensitivity is not super high, but my Sisma has absolutely no issues driving it to where I want it volume wise.

Bottom line, this little cabinet caused me to sell 12" and 15" cabinets that I thought I would keep for a long time. Even comparing this tiny little cab to a very highly regarded 15" cabinet that I had, the low end was much tighter, punchier and even though the "flapping pants leg" effect was slightly less because of the smaller driver, I still preferred even the low end and certainly the tone of the 9PM over the 15" cab that I was using previously. I now have a 12AM cabinet on order from Tom and hope to get it in a month or two - they are not inexpensive cabinets at all, but if you are looking for the best bass cabinets that I have ever heard, I would give Tom a shout.
Shannon!! Thank you so much for the astounding review. I do wish my cabs were as perfect as you say, but alas, they are human-made and imperfect.
But I have done my best, and the patented low end and clarity are in my cabs for all players who want to hear themselves in a way that provides the accuracy of a DI input, with the satisfaction of a physical low end.
Right now, all cabs are still made one-at-a-time, totally bespoke, as I make all my own cabs/vents/grills, and all hand colored with transparent dyes (yours just happen to be a special black, but still transparent to grain under light).
Thanks again for spreading the word, and I hope you feel just as satisfied by the 12" cab, just getting under way. Take care,
Tom

PS... if anyone wants information, go to the website (trudeepbass.com), send any notes through the email form (info@trudeepbass) or DM me through Instagram @TrudeepBass
It may take a few days to get back, but I'll answer any questions I can.
 
They look very similar to the amazing Audiokinesis Hathor cabs.
In some ways they are similar, and I like the Audiokinesis designs. But I use midranges, not tweeters, and I have patented long and curved vents inside, which no other company can offer (until 2046). So my low end is very solid, and the harmonic integration of fundamental and overtones is very nice and musical.
Thanks for interest!
 
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I would not be surprised if the 9PM sounds great, but I would caution people in regards to how loud such a small, HiFi cab can play. Make sure your expectations are reasonable when buying, because these cabs are not claiming to break the rules of physics and play loud.

Here is the specs for the 9PM
View attachment 7564845

F3 of 49hz is relatively low for a 1x9 cab...but not particularly low for a bass cab.

The more important specs IMHO are the power rating and sensitivity.

Assuming 175W RMS can be handled to 49hz and sensitivity of 90dB 1W/1m, calculated SPL is 112.4dB, which IME is extremely limited for live music performance.

The Truedeep website suggests:View attachment 7564847
I did the red underlining. Adding a second 9PM will give you +6dB/raising calculated SPL to 118.4dB if your amp can deliver 350W at 4ohms.

IME 118dB is usable for relatively low volume jazz gigs. For me it was borderline for most of the big band work I did.

For comparison the Acme Low B2 calculated SPL limits are almost the same as a pair of 9PMs. The Acme plays significantly lower with F6 of 31hz. I thought the Acme sounded great in big band but I had to play with restraint/limit my dynamic range to avoid clacking the woofers.
I totally agree that they are called the Laws of Physics, not the suggestions of physics! So, yes, the 9pm is not super load and if you play big stages and high volumes, you should consider my other, larger cabs. At the extreme other end, a stack of my 15's compares favorably with an 8x10 "fridge".
One thing worth considering is perceived loudness. By that I mean, all of us bass players were used to a high level of attentuation below about an open A on most cabs. When mine deliver a solid open E, people think they are "loud" because that SPL at that Hz would normally require a lot of power and turning up the volume.
They are not "louder" just more even in frequency distribution, so that you need to adjust the scale of your sense of loudness, accepting that you now actually hear fundamentals down low, and not just the upper harmonics.
I'll have a jazz club announcement, soon, and maybe in the right situation, they don't struggle. And, as mentioned, for louder shows, just go bigger. The fact that professionals in NYC play my 9pm for shows on a regular basis, indicates they are workable, as well as musical, if you keep the reality of the Laws of Physics in mind.
Thanks for the interesting and sensible post! I'd like to hear what you think after playing Trudeep.
 
@TrudeepBass Thanks for dropping in.

You need to update your profile to indicate your are a commercial user. Right click your TB name on the right side of the banner that runs across the top of the page. Click open in new tab. This opens an account details page. Scroll down about mid way, check "Commercial User", and fill out required disclosures.

1787678811676.webp
 
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In some ways they are similar, and I like the Audiokinesis designs. But I use midranges, not tweeters, and I have patented long and curved vents inside, which no other company can offer (until 2046). So my low end is very solid, and the harmonic integration of fundamental and overtones is very nice and musical.
Thanks for interest!
Actually, the Hathor/Changeling cabinets also use midranges, it’s the Thunderchild line that uses tweeters. But - I think you’re onto something with that design and I really like this type of cabinet innovation. Not sure how many cabinets Duke LeJeune is building these days, nor whether yours would directly compare.

I do think a line of very portable small cabinets that are still serious tools, versus practice amps for beginners, has a lot of potential.
 
I'm sure Tom will chime in with an accurate response, but the design and construction of the cabs are very involved along with being very selective about components - drivers, wire, caps, wood, etc. I think to lighten the cabinet would be to compromise the tone.
 
The only tradeoff that Tom had to make is that the sensitivity is not super high

1,000% THIS!!!! I understand the historical desire for efficiency, but with modern PA/IEM support AND how cheap watts are these days, I would personally love to see the leverage of Hoffman's Iron Law leaning more towards small size and deep frequency response at the expense of efficiency just across the board.

My LEAST efficient cab is about 100dB/w/m with a frequency response of 40Hz (-3dB) and I would GLADLY trade 5dB sensitivity for 5Hz lower extension! The tricky part is, with lower extension ALSO comes more physical movement of the cone (XMAX) AND more port velocity, etc, so that all has to be baked into the speaker, and cabinet, design as well, which isn't always a super easy task.

I'm casually working on a 3-way desktop speaker set that goes to about 32Hz (f3) with a 5.25" woofer. It's tricky as heck getting ports stuffed in there WHILE also keeping port velocity appropriate AND having the proper bracing, etc, and blah blah blah... Point is, it's harder than just stuffing a smaller driver in a box, shoving a port in there, and calling it a day AND when that's all worked out, the sensitivity will be "crap" at somewhere around 80, but it's a near-field desktop speaker so who cares about efficiency??

I've honestly thought about building my own enclosure with a HT sub (probably sealed - maaaaybe a passive radiator), dedicated mid, and perhaps a nice tweeter. I've never seen a ribbon or AMT tweeter in a bass cab, but I'm actually dang curious. It would be FAR less efficient than anything any big box manufacturer puts out, but for bedroom practice, and small venues that legitimately don't have PA support, who cares??
 
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