Can someone explain the "Preset Depth" knobs?

[tele_jas]

I just spent about 2 hours "learning" my new Mark V. I pretty much have a grasp on what everything does, except the "Preset Depth" knobs? Can someone please explain what these do? - Please use little words and pictures (I don't really need pictures).

Thanks in advance!

 

[SonVolt]

It simulates the V curve of the graphic equalizer. This is to allow different GEQ settings per channel when you only have 1 GEQ. Most people I assume use the real GEQ for channe 3 and the preset knobs for channel 1 & 2.

 

[Archlute75]

It simulates the V curve of the graphic equalizer. This is to allow different GEQ settings per channel when you only have 1 GEQ. Most people I assume use the real GEQ for channe 3 and the preset knobs for channel 1 & 2.

I actually use the sliders more on Ch2 than elsewhere, but to the original question though:

Basically, you are looking at a variable depth of the standard "V" curve on the sliders. How it sounds to my ears is that the further counter clockwise the knob is turned, the more shallow the V, while the further clockwise it's turned, the deeper. So, all the way counterclockwise you're going to hear more mids, and all the way clockwise the bass and treble will be emphasized. That's how it sounds to my ears, anyway.

 

[eatsleeprock]

From what I have read (and just to disagree with everyone else, cause that's always a good time) I understood that they knobs acted as a 'eq mix', allowing you to basically blend the dry signal with the eq'd signal. This would let you have an aggressive eq set for one channel, but only dial in a little bit of it into another channel. Think of it like this, when the knobs are at zero, you're running the eq as if it was flat. When the knob is at five, its like your sliders are all at a halfway point between where they actually are and zero. If that makes sense.

 

[MrMarkIII]

From the manual:
"Many of the MARK Series sounds that have become classics were achieved by applying the Graphic EQ and radically altering the somewhat mid-pronounced voice of the MARK sound in favor of a more “scooped” midrange. The most popular of these altered sounds is the dropped-mid “V” curve that makes everything sound gigantic as lows and highs are boosted alongside these radically scooped mids. Because this sound shows up time and again on customers’ amps we have included yet another way to utilize this classic sound.
The MARK V takes this scooped-mid concept to a new place with the inclusion of Channel Specific rotary PRESET controls that can be assigned to any or all the Channels. Looking at the EQ Section you will see that the trademark Boogie 5 Band is joined on either side by a stacked row of controls. On the left you have a bank of mini toggles that repeat for each Channel and give you a choice of applying the SLIDERS or - for the first time - a very handy rotary control called PRESET which resides in the bank of knobs on the right side of the SLIDERS that allows you to dial in a desired blend of the mid-scooped “V” curve.
This assignable choice increases the power of the EQ section many times over and enables you to use the SLIDERS for specific tweaking of trouble frequencies for different venues or recording or to craft EQ curves that are uniquely different from the PRESET curve where mids are cut and lows and highs are boosted."

Note the highlighted areas. The preset EQ knobs always cut mids, and boost bass and treble.
The sliders let you boost and cut any of the EQ bands freely, in any combination.
You cannot, for example, boost the mids with the Preset knobs.

 

[crane]

The schematic show clearly a toogle in the GEQ between the sliders and fixed resistors + mix pot for each channel.
The fixed curve is the same for all channel.

 

[FastRedPonyCar]

I've read what the manual and all that says but my ears tell me that it boost or cuts a certain portion of the low end.

I use it to pull back some of the big low end on channel 2 in mark 1 mode.