Low-end limit of MV25: It's the presence, stupid!

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elvis

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Yup, I'm an idiot.

I had rehearsal last night and wound up playing my MV25 into a widebody ported and ran a stereo feed into my HT-20 just to get some low-end. I A/B's the amps and the MV25 output was really anemic, while the HT-20 had huge low-end, but lousy highs. Sounded pretty good together, though.

Today I went back to the store I got my MV25 from and plugged back into the same cabinets from my original demo, and A/B'd my head with one they had in stock. Their head was actually a little BRIGHTER than mine. Guess mine is working fine. Their cabs: Theile on the bottom, slant MR1x12 on top.

Played with the tone and GEQ trying to boost low end, got a bit confused. Then :idea:

Turn down the treble and turn up the amp.

It worked! Then tried the Presence. It DOUBLE worked!

Background: I have never had an amp where the presence did much, and I usually set it at noon or a little above and then forget it's there for the rest of the time I own the amp. I also tend to set treble at like 1:00 and lower mids and bass on Mesas. I have been dialing this amp with those assumptions in place.

Once I killed off some highs (eventually set Presence almost at Zero), I as able to get the floor to literally shake. There is nothing wrong with this amp. Me, not so much. Ch2 with GEQ switched off also sounded less honky that way.

As a followup, I also tried each cab separately. The Theile thunders and stood up really well all on its own, and the MR1x12 was pretty decent as well. Might have been even better on the floor. I think that the floating floor of this particular store helped, as it had a ton of low-end resonance. So now I have to try this again at home to see how much is the cabs I am using, the floor they are sitting on, and the amp itself.
 
Right on man.

I recall the presence control on my Mark IV also needed to be set fairly low (below 3-4) otherwise the tone and feel went all tinny and painfully bright. I know that in the tone stack of the bigger Marks the treble comes first so higher values leave little signal for the mid and bass controls. Maybe it's even more sensitive on the mini. I also wonder where the presence control is located in the circuit to have such a dramatic effect.

Either way, thanks for the tips. I'll be sure to remember them when mine gets here.
 
Update:

Tried my amp at home. It roars. A little less low end than at the store, and a little different character. I chalk that up to live floor at the store vs. dead floor + carpet at home, though my speakers are a bit different as well.

I ran through my vertical recto 2x12, widebody ported 1x12 and 4x10.

The 2x12 had good low end, but the least of the three. Possibly because it is up on casters. Need to take them off and try again. Overall, best mix of low and high, as well as most lively-sounding. I like that cab a lot.

The 1x12 sounded TERRIBLE. No low-end at all, despite the smaller Theile at the store having lots of low end. HINT: it was up on a stand. I put it on the floor and it has low end for DAYS. Flip it up on its side, and lose a little low end, but better overall across frequency, almost rivals the 2x12. A lot of sound out of a relatively small speaker. Now to buy another to stack on top...

The 4x10 had the most low-end, but tends to sound a little dead on top. Probably a little tone tweak would help, but I'm trying apples-apples at the moment.

So big relief. This thing does the job. Plus, I can turn up the Presence and get a more tighter, focused metal tone without changing any other controls. And a little work on the presence knob makes the Mark IV mode a bit less fuzzy as well.
 
Thats why i like my Express 5:50+, it has no presence knob to be confused by!!
 
My limited experience suggests that the presence control as a lot of interaction with the type of pickup you are using. I have a Heritage 535 with SD59 that seems not as sensitive as my Heritage 357 with lollar Firebird (where if I don't roll the presence down I can make you hears bleed)
 
Elvis, You tha man!

It sounds so much better! I'm running the presence at about 9:00 now and it sounds soo much more thick.
 
I tend to like the presence on the MV25 at about 9 oclock also, but I've got the treble at about 2-3 oclock. I am in love with this amp and can't get enough of IIC+ and Mark IV modes. Oh yeah, cleans are pretty good too :)
 
This is something that is true of the Mark series. Basically when you take one of the tone controls (bass, mids, treble) and have one of them near their maximum, the other tone controls lose a lot of their influence on the tone. So when you spike the highs, the bass and mid knobs don't do much. And vice versa. Still we tend to tweak and get away from those "optimum" Mark settings.
 
the difference in speakers,
is probably the single most important tone item out of all of them.
 
At this point I'm really digging the presence control. I use it to compensate for which cab I'm using, which guitar I choose, and sometimes which song I'm playing. It's like a "character" knob. Super useful.
 
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