snipelfritz wrote:OMG what the fuck does the presence knob do?
A presence knob controls the amount of treble in your signal so if the treble is all the way up but the presence is all the way down there will be "no" treble the more you turn up the presence knob the more of that trouble affects your guitar signal. And also upper fragile harmonics.
So if the treble is all the way down and the presence is all the way up, there should similarly be "no treble" in your sound right? I am kinda confused by the point of having two knobs that are interactive, I always thought of the presence knob as another EQ "band" that controls frequencies higher than the range covered by the treble knob.
My own stupid question: How well does playing an amp-in-a-box pedal into a completely different type of amp approximate said amp? For example, would running a pedal touted as a "JCM800-in-a-box" into an AC30 make my AC30 sound like a Marshall? Doesn't seem very plausible to me!
mr. sound boy king wrote:
Organic apples are not normal, they are special, like analog, whereas normal apples, like digital, taste sterile and lack warmth.
Schlatte wrote:Really stupid question..,, what does "getting your guitar/bass set up" mean? I know it has something to do with tuning/ string height etc. But yeah... I have no idea what it actually is.
colin wrote:Set up means adjusting intonation, string height, truss rod, etc. Basically doing all the little things to make the guitar/bass play as well as possible.
And to explain intonation a bit... It makes sure that when you play an A on the 5th fret of the e string it is the same note as on the 10th fret of the B string, and the same as the 14th fret of the G string. It makes sure you're playing the correct notes consistently, no matter where you are on the neck. That way when you play a D chord as an open chord, an A shaped barre chord on the fifth fret, or an E shaped barre chord on the 10th fret all the notes are tonally correct.
mr. sound boy king wrote:
Organic apples are not normal, they are special, like analog, whereas normal apples, like digital, taste sterile and lack warmth.
Presence is a part of the negative feedback circuit that takes a portion of the output signal (usually a tap on the ot tranny) and most commonly feeds it back into the phase inverter part of the circuit.
Presence boosts high frequencies by actually cutting the amount of high frequencies being fed back which reduces the amount of hf in the negative feedback and therefore boosting the hf on the output.
Most amps with negative feedback have a tighter feel ... in addition to being able to shape the hf response this way, while amps without it tend to have a more looser bottom end with more sag.
and this:
In some amps it's more of an upper-mid EQ control, but in the classic Bassman-derived/Marshall circuit it's a negative feedback loop high frequency control. Turning the presence up takes highs out of the NFB loop.
What this means is that it doesn't so much control the amount of top-end - although it does to some extent - but that it controls the dynamics of the top end. NFB is like a 'regulator' - used to smooth and even out the response - so if you take some frequencies out of the loop, these become less restricted and 'peakier'.
Turning up the presence not only makes the amp brighter, it makes the brightness more spiky and dynamic than the rest of the sound too... which makes it very much more obvious and helps the amp cut better in a mix, and is why 'presence' is such a good name. It doesn't affect any particular frequency, since it's done with a single cap - it simply has more effect the higher the frequency.
The fact that it works on the NFB loop (which is part of the power stage) also explains why it doesn't seem to do all that much at lower volume when the power stage is clean, since the NFB loop is working on an undistorted sound with fairly even frequency balance, but once the power stage goes into clipping this generates a lot more highs, and the presence control become far more effective - on classic Marshalls, it basically becomes the only control that does much when the amp is fully cranked
snipelfritz wrote:OMG what the fuck does the presence knob do?
A presence knob controls the amount of treble in your signal so if the treble is all the way up but the presence is all the way down there will be "no" treble the more you turn up the presence knob the more of that trouble affects your guitar signal. And also upper fragile harmonics.
So if the treble is all the way down and the presence is all the way up, there should similarly be "no treble" in your sound right? I am kinda confused by the point of having two knobs that are interactive, I always thought of the presence knob as another EQ "band" that controls frequencies higher than the range covered by the treble knob.
My own stupid question: How well does playing an amp-in-a-box pedal into a completely different type of amp approximate said amp? For example, would running a pedal touted as a "JCM800-in-a-box" into an AC30 make my AC30 sound like a Marshall? Doesn't seem very plausible to me!
I have a Box of Rock clone, which is a Marshall JTM45 in a box, and I use it through a 1985 Roland JC-120 and a Marshall JCM800, both of which instantly become a JTM45, the JC-120 sounds better though since it has "Character" than the JCM800, but the amps don't react like a JTM45 would, it's not the same "feel" that an actual jtm45 would have, but, it's way cheaper and easier to buy one pedal than to buy a JTM45.
^ Agreed. Often times they work suprisingly well, but only to a certain extent. The box of rock wouldn't do the same thing if it were being played through a starter pack silvertone.
Last edited by wsas3 on Sun Apr 15, 2012 3:51 pm, edited 1 time in total.
Chankgeez wrote:True, but you can also use the Klon as a tremolo. Just stomp on the switch as fast or slow as you'd like.
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or a model in the case of e.g. the Tech21 dealios. sometimes that sort of thing can work quite well, but only if the amp you're running it into lends itself to reproducing that sound. i.e. if you've got a nasty little Supro it's not gonna sound like a clean Twin no matter how good of a Twin-in-a-box you've got, and a high-gain amp will obliterate the differences between your WIIO and your Box of Rock. some of my laboriously-tweaked PodXT models sound tits on my Laney, and others just...don't.
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FIFTY YEARS OF SCARING THE CHILDREN 1970-2020--and i'm not done yet
behndy wrote:naw. not really dumb if you've always used rackmount stuff.
head = preamp and poweramp in one box.
cabinet = speakers in an enclosure.
combo = all in one box, head and cabinet in one solid piece.
like, i run a Rusty Box -> QSC GX-5 -> Aggy GS212. they COULD make a head that's all of the Rusty (preamp) joined into one unit (giggety) with a poweramp. or make a head out of the poweramp and join in a speaker and have a combo.
i like modular setups, so heads and combos never made much sense to me.
I have no clue about the whole Head + Cabinet thing. The Cabinet is just speakers? Does the Head make any sound? Can you just play through a Cabinet?
The cabinet is the box with all your speakers. The head is what amplifies whatever signal you're running through it and outputs it to the cabinet. But without a cab (speakers) connected to it, you're not gonna hear anything. And your head will probably not be very happy. Maybe you could play through a cabinet alone by using a Blowing Up boost or something...I guess it would have to be a really hot signal for you to hear anything coming outta the speaker(s). A combo amp is the head + cab consolidated into one box. I use "amp" to describe the full setup of both head + cab. "Head" is always the head for me.
