Help me with my JSX (overly bright sounding)

[kmanick]

I don't either Pete.
I basically run mine like this
Crunch
treble=4
mids=4
Bass-6
gain =2-3:00
fat=off
Ultra
treble=4
mid=4
bass=7
gain = 1-2:00
fat= on
presence=4
low res=6
these are settings for going back and forth as rhythm/lead channels
I tweak the treble and the mids "by guitar"
when I use the ultra "alone" like with my 7 string and get into Nevermore/Dream Theater mode
I may back the mids and the presence back a little more bring the gain
alittle past 2:00 oclock and turn the fat switch off.
I've got my El34's biased to 39MA (which equal right about 11:00 on the bias switch)

I turn on my clean boost in front and it's right where you'd want it to be.
There may be some heads going out with inconsistent parts. I know someone who just bought a brand new 6505 combo.
I absolutely love my 5150 combo and his sounds like total "buzzy" shit, even with the tube swap.
I mean I know plenty of instance's where a certain Marshall will sound great where another (of the same model ) doesn't. I've played 900's back to back that sound very different from each other.
could be the same type of thing going on here.

[khabibissell]

I basically run mine like this
Crunch
treble=4
mids=4
Bass-6
gain =2-3:00
fat=off

That is very, very close to how mine was set up. I'm telling you guys... it sounds like a wah is on in front of the amp. Sounds like the same problem the original poster is having. The amp is played through either the matching JSX cab or a Mesa Recto traditional 4x12 (which sounds best). I've also tried screwing with the bias adjustment (left is hotter) and that helps a tiny bit.

It irritates me because the amp is very close to being something I would really dig. I didn't spend too much time with the particular amp I ended up buying, but I tried different amps on two separate occasions and it sounded pretty damn good both those times. I dug mine for about 10 minutes after I brought it home then I started to notice that piercing wah sound. My brother even brought it up without me mentioning it.

[Boxcar Willie 84]

why not buy a parametric eq and dial out those frequencies?

[madryan]

I've been running this cheesy little Digitech RP-whatever thing in the loop for Delay and it has a very limited EQ. I notice that I can get the amp to sound great with that crappy EQ in the loop so I may just get a nicer EQ and a Separate Delay seeing as I don't dig the lack of flexibility in the Digitech unit. I'm still going to switch to TAD 6L6's and try different preamp tubes. It's like $110 or something for what I need and I can bias it, or have it done for $20 locally.

[bibz]

I dont get it either. I had a piercing treble fizz going on with the 5150 cab, but lowering the presence knob to ~1ish took care of it. G12T-75's sound amazing with it for me. Crisp and clear even with massive amounts of gain. Its only the voicing that I can hear could be related to these issues, but again, mine has no problems there. Possibly a change of component manufacture?

[Shawn Lutz]

that wah surpress trbel tone would drive me batty as well. Why not ditch it and grab the new EVH 5150 III?

[Eric_kv2]

why not buy a parametric eq and dial out those frequencies?

+1
An eq in the loop well help you fine tune the amp even more.

[shreddermon]

+1. I've run a Boss EQ through my loop for years now - JSX or otherwise - along with a noise gate.

[lynchfan6]

Some say the "treble" of the 5150II came from the fact that Eddie's ears are fried, and he can't hear highs very well. Maybe the same was true of Satriani when voicing the amp. In all honesty, I never like Satriani's tone..........the guy obviously can play, but never been crazy about his sound.

[Spivonious]

why not buy a parametric eq and dial out those frequencies?

Because if you don't like the amp's tone, then why bother fixing it? Just dump the amp.

[madryan]

Because if you don't like the amp's tone, then why bother fixing it? Just dump the amp.

Actually, overall I really like the Amp's tone. It's just the icepickey highs that bug me and I've found a way around it with the EQ in the loop.