Carvin Quad X Amp Demo
28 Video Views·Jul 9, 2026
A little playing on the Quad X through the Marshall into a Carvin 412B.
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Video Summary
AI GeneratedThis video provides a comprehensive demonstration of the Carbon Quad X amplifier, showcasing its four distinct channels, EQ settings, and integration with a Marshall power amp. The presenter explores the tonal differences between clean, rock, and high-gain settings while discussing the impact of pickup selection and tube configurations.
Okay, here we have the Carbon Codex with channel 1 and a little bit of reverb just to fill
it out a little bit.
It is the stock spring reverb that you'll be hearing all through the demo.
I don't have it very wet.
Some people just hate spring reverb so I don't want to make it real wet but I don't want
it to be so dry.
You'll just go, wow it sounds terrible and turn the video off.
So it's got to sound a little warm.
I'm not running any effects in the master loop and that's the only effect that I'm using.
So just channel 1, finger picking, lick and go in here, that's the bridge pickup.
And I should mention that I'm playing a Schecter C-1, a 30th anniversary model and it's loaded
with Seymour Duncan Custom Custom in the bridge which is really hot and bright and a 59 in
the bridge.
So now you know what the guitar pickups are loaded with.
That's it.
Other than that just the amp straight into the Marshall.
The neck pickup.
Slightly warm, slightly on the bright side, you want to get some quack, you want to get
the treble pickup.
So it's real sensitive to the type of pickup you're having that you're using and what kind
of guitar you're using.
And ok so channel 1, I made the description before of it being kind of like a tube quality
to a JC-120.
It has really well defined lows but it's got the shimmering highs.
Both pickups.
Rhythm pickup.
And there's also a bright switch on the amp.
You may not hear that so much in the video but it adds a lot of shimmer to it.
Now you can hear the reverb.
And so that's it for channel 1.
Let's hear channel 2.
With the bright button turned off.
Both pickups.
It's very similar to channel 1, there's just a quality to it that's different that I can't
quite put my finger on.
I think it's got more low mids in channel 2's circuitry than channel 1.
It's just got a, somewhere in there there's a little bit more warmth than channel 1.
The low notes are a little bit more defined.
Or if I do the same thing on channel 1.
Oh that's pretty close huh?
So anyway.
But it's ok, I got them EQ'd fairly close.
My EQ on channel 1 is 7 and then the mids are on 4 roughly and highs are on 6.
On channel 2 you only have a low and a high control and the lows are on 8 and the high
is on 6.
So they're EQ'd pretty closely.
The mids are probably affected by, the upper and lower mids are probably in the sweep range
between these two controls.
Where on channel 1 you have a dedicated mid range.
Let's go to channel 3.
It took a while to get channel 3 to sound decently usable.
It's got a rock tone to it and we just used both pickups.
So there's a smooth kind of break up to it that I like.
And that's with two pickups, gets a lot, changes quality a bit when you go with a bridge pickup.
Roll off the volume a little bit.
Now there's also a boost that I can use on each channel.
It takes the clean channels to being way too loud.
But channel 3 here is really handy as you'll see.
So now with the boost switch in on channel 3 and using the bridge pickup.
Apparently the same type of rhythm example.
No, I'm not going to play AC DC.
What I like about the amp so far is that it brings out the high notes well when I play the whole chord.
That cuts right through.
So that's pretty good rock distortion in channel 3.
So I'm pretty happy with that.
And on channel 3 my overdrive is actually set to 7 so I got more in there.
The low is on 8 and the high is on 6.
So you're going to hear that theme throughout.
My highs are all on 6 and the lows are on 8 or 7 usually around that area.
And the mids are fairly flat.
Except I got it scooped just a little bit on channel 1.
And if we engage the bright switch with the boost on channel 3.
That's the bright.
In my ear it sounds better without the bright on.
Let's go to the insane sustain channel.
As you can hear I'm just kind of messing around. I'm not really playing any songs.
Now this channel I do have the graphic EQ engaged.
I think it was also engaged on channel 3 a minute ago.
Over here we can do really good tone shaping with the EQ.
I like a little bit of a scooped sound on the distortion channels.
You might be thinking, oh that's not that heavy. Oh yeah, watch this.
So there's your death metal tone.
The sample can go wherever you want to take it.
This may sound kind of familiar.
Let's try that again.
So, there's some really good stuff on channel 4.
And the lead guys, it's just...
That was sad.
Let's try that again.
Channel 4 with the boost in.
Let's try that again.
With the boost and bright.
And as you can hear there, the gate kicks in.
So that's just kind of some really bad playing to demonstrate.
This isn't what I do anymore. I don't rock out anymore much ever.
It's all I used to do.
So what am I doing with all this gain? I have no idea.
I guess it's just for when I want to throw a fit.
I'm probably going to spend most of my time on channels 1 and 2.
Or 4.
So anyway, channel 1.
Channel 2.
Sounds pretty identical.
Channel 3.
I just want to hit it harder.
It always sounds like something is holding back channel 3.
Channel 4, nothing is holding it back.
I'm also running this through a Marshall power amp.
And the Marshall power amp has 6L6 WXTs installed for power tubes.
And it's got all stock preamp tubes in it.
There are 12AX7s for the preamp tube.
And I think it's an AT7 in the other slot for the phase inverter.
That's the word I'm looking for.
And I'm running the Marshall in more like the British mode than the American mode.
It's kind of like when you clip these out.
For comparison, kick them back in.
So there's more mids when it's in this position.
And I have the presence about half.
And the volume is a little over half.
So that's it for the little demo.
My new Carbon Quad X amp that I built the rack around.
So anyway, I hope you found it helpful.
If you don't know what the tubes are in it, watch my other video on tube selection.
And I go over all the tubes that I put in it.
And so I hope you like the video in spite of my sad playing.
Especially for lead attempts.
But anyway, I'm just not all here at the moment.
But I do much better with a song.
Anyway, a little demo on all of what this amp can do.
And I'm sure it can do a lot more.
So thanks for watching. Please subscribe.
And probably at some point in the future,
we'll mess with different setups with this amp.
Because there's six effects loops on it.
And I haven't done anything with the MIDI capability.
Another thing real quick on the MIDI capability.
MIDI only changes channels on this amp.
It does not engage and disengage the boost.
So the carbon foot switch is about as MIDI as it gets.
So it's just a channel switcher.
But if you have MIDI effects like my Yamaha here,
or some other unit, then you can still patch that in
to the system with your MIDI pedal.
And I have yet to learn all that.
So I never really mess with MIDI much.
So as far as having different settings patch into different channels,
I'll have to figure all that out.
So, anyway, until next time.
Cosmic Harvest, signing off.

