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Monster Subway D-800 Project

I've gotten a lot of questions from other bass groups I'm a part of on this topic, so I figured I'd start a journal of sorts to track my opinions of the Mesa Boogie Subway D-800.

In May of 2022, I joined a local doomcore band that is notorious for their extreme volume levels. They had a few bass amps left by the previous bass player that I tried to use for a bit, but over time I've put together a behemoth of a rig that seems to be filling the bill.

The first thing I did was buy replacements for the borrowed cabs which, over time, consisted of an Ampeg 8x10, a no-name 2x18, and a Woodson 2x15, along with a couple of attempts to incorporate a few standalone single 15" cabs. I finally settled on a Mesa Boogie 2x15 Diesel and two single Yamaha 18s.

The Boogie had the drivers replaced before I purchased it with two Eminence Kappa Pro-15LF-2s.

Throughout the trial and error phase, I was powering all of this through an Ampeg SVT-4 Pro. The most recent configuration was this head running through my Diesel and two 18s. I had the Diesel running off of one of the two power amps in the SVT at 4ohms and the two 18s running off the other SVT power amp at 4 ohms.

The problem, for me, is I felt that they SVT-4 Pro almost had too many options for tone shaping. Traditionally, I shape my tone with the bass I play and through my pedal board. I have been able to get great sound with these on every other amp I own, but through the Ampeg, it just sounded bad. I wanted something that was more simple, more or a pass-through for my pre-amp tones; just basically to take that tone and make it louder.

I considered a few different things, but ultimately went with a Mesa Boogie Subway D-800. It is my first class-D head. I intentionally didn't choose the 800+ or TT models because I wanted something very simple.

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I have only had the head a few weeks. I had my doubts about this thing being loud enough and enough power to push my cabinets. But at 2ohms, this thing can hang with the Ampeg levels for sure.

It does run a bit warm, but so far no issues with overheating, etc. I think this will be the thing I'll need to keep my eye on.

Even with the limited tone shaping capabilities of the Subway, I'm still tweaking things a bit. Everything changes at super high volume. The biggest issue I have had so far is keeping this tiny head stationary when playing at high volumes. I'm currently using velcro on the feet, but the adhesive isn't wanting to stay put. Thinking of other solutions now.

I'll post updates as I make more progress with the settings.

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Be sure the amp is switched to 2 ohm mode.

You might prefer the tone with the voicing control closer to the 12:00 position unless you are doing a lot of slapping... but I wouldn't think that's a speaker system even close to ideal for slapping anyway.
 
Be sure the amp is switched to 2 ohm mode.

You might prefer the tone with the voicing control closer to the 12:00 position unless you are doing a lot of slapping... but I wouldn't think that's a speaker system even close to ideal for slapping anyway.

Appreciate the insights. I definitely have it set for 2ohms. That's a must.

Definitely not slapping. I do finger-pick only, but I'm also using different overdrives. I'll play with that voicing setting a bit.
 
Time for a couple of these: Mesa/Boogie | 2x12 Subway Vertical Bass

Or a couple of these: Mesa/Boogie | 4x10 Subway Bass

I bet that they would work well for what you do.

I also recommend that you invest in something here as well. Ear Plugs, Earphones, Ear Muffs, & White Noise at Ear Plug Superstore!

Yeah I have considered a 4x12 of some sort, but at this point that would mean replacing either the 15s or 18s, or getting another head (or going back to the SVT-4 PRO, which I'd prefer not to do).
 
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I respectfully suggest a more coherent approach to your speaker system. Unless the sensitivity of the 18s and the 15s are pretty closely matched, you might be leaving some performance on the table if you drive them all off of the same power amp. With your 2-channel Ampeg, you could adjust the respective volumes of the 15s and 18s separately, but now you may well be running out of headroom with one pair well before the other pair has reached its maximum potential. I'm thinking specifically that those Yamaha 18s probably have difficulty keeping up with the Mesa 15s. I could be wrong about it, but I think you'd be better off with another Diesel 215 cab if you can get one. Or a pair of the new Subway 215s, as suggested, would probably be better still.
 
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My first step would be setting the 215 cab vertical, but given the Kappa 15LF and EQ settings on the amp, I’m guessing that midrange articulation is not one of your tonal goals.

I used to have a Sunn 215 that I retrofitted with a pair of Kappa Pro 15LF, and I ended up blowing both of them.

That was an expensive lesson, shared in the hope you can benefit from it.

My suggestion would be to investigate the tuning frequency of that Mesa 215 to make sure it’s a compatible “home” for the 15LFs.

Here’s a video of me with that cab - for my high-volume bona fides
 
I respectfully suggest a more coherent approach to your speaker system. Unless the sensitivity of the 18s and the 15s are pretty closely matched, you might be leaving some performance on the table if you drive them all off of the same power amp. With your 2-channel Ampeg, you could adjust the respective volumes of the 15s and 18s separately, but now you may well be running out of headroom with one pair well before the other pair has reached its maximum potential. I'm thinking specifically that those Yamaha 18s probably have difficulty keeping up with the Mesa 15s. I could be wrong about it, but I think you'd be better off with another Diesel 215 cab if you can get one. Or a pair of the new Subway 215s, as suggested, would probably be better still.

Yeah this is all experimental at this point. You may be right that I'm leaving some performance on the table with this set up. I may try bringing the SVT-4 Pro back into the mix to run just the 18s and see how that sounds. I will say that I tried bi-amping with the SVT-4 Pro and I just didn't like what it provided.

I have also considered the Subway 2x15s, or maybe a 4x12 Powerhouse and a Subway 2x15.
 
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