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Base theme by DesignModo & ported to Powered by Vanilla by Chris Ireland, modified by the "theFB" team.
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Presence 0 - full NFB on all frequencies, smoother sound.
Presence 10 - no NFB on highs, giving a more dynamic and spiky sounding treble which cuts through a mix really well, ie ‘presence’.
It becomes more effective at higher volume.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
As RandallFlagg says, on the models with Extreme mode it simply turns it off entirely. (And on the ones with a Raw mode, I think.)
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
As is often the case in the guitar amp world, a word that means something else to everybody in the studio and hi fi world has been "purloined"!!
On a mixer, "presence" is a control that boosts or cuts the upper mid frequencies, say 3-5kHz but is in fact usually called "mid eq" and has variable turnover effs. The rest of the spectrum is unaffected.
The NFB presence control that ICBM so ably explained works over the whole upper spectrum from say 3kHz. Since a guitar speaker has falling output past ~5kHz and next to buggerall by 10kHz the moniker is perhaps justified!
Dave.
Might have to play around a bit more...
yeah but to me it just sounds like < M o r e W d i t h >
FYI on the 104 it changes the response at 50Hz by about 14dB and about 10dB at 100Hz, past 100Hz it has little to no effect.
I would aver that 100Hz is beyond the range of many guitar speakers and standard guitars so, unless you have a 4x12 closed box loaded with 55Hz Greenbacks the control is going to be subtle!
Dave.
On the ID series these two controls are far more effective than the normal EQ.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Ah! Well! If we are talking "out of band" signals IC then I stand corrected! I only had a bit of a "fiddle" at modest volumes with an S1 and could not tell a lot of diff' even though it met the specc'.
I was really responding to the guy that did not find the control all that effective?
YOU gigtists!!
Dave.
My starting point for any of the Blackstar amps with a resonance control is to turn it up FULL and only back it off if the low-end is just too boomy - presence less so, but it still needs to be above halfway. It's actually much more useful to have both controls than simply turning off the NFB entirely - I had to modify a friend's Mesa because it was so undamped in the 'Modern' mode (no NFB) that the speaker would resonate after a staccato note and make an odd booming 'reverb' noise. I added a pot to reintroduce just enough to stop it without taking away the loose sound he wanted.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Cannot recall IC, have you tried an Artisan 15 or 30? They have no NFB at all a la AC30.
Dave.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
It’s just that I’ve occasionally often wondered wether I was using them “correctly” (whatever that means - I’m very much an “if it works for you it’s right” kind of guy when it comes to this stuff) and/or whether I was missing out on any of the amps potential ability/range/vocabulary by not experimenting beyond that simple “global eq” model...
Just out of interest IC, what value are the main smoothing caps in an AC30?
Dave.
The recent Custom Classic uses switchable main filtering, either 22uF ('vintage') or 44uF ('modern') with a valve rectifier, 10uFs in the preamp, and sounds good, but the current Custom model uses 47 before the choke and 100 after, with a solid-state rectifier... and to me, sounds too stiff and flat.
The AC30 circuit does seem to be much more sensitive to filtering than some others - the switchable 22/44uF on the CC model is very easily audible. I've noticed much less change when increasing the old 32uFs to 50s in Marshalls.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Right well the Artisans are 47 and 47mfd across a choke and 10 or possibly 22s downstream for the pre amp. Will check.
Dave.