Hi Guys. I'm new here, but wanted to post my experience with the PRS SE30 Combo. Just so you know where my "ear" is, I've been using mainly Peavey Classic series and 5150 amplifiers, with some others that I've owned being Marshall, Mesa, Budda, Blackstar, and Egnater.
Let me start by saying that you can get great tone out of this amp, it just may require a different approach than you are used to. If you are a higher gain player like me, you can't rely on the channel gain knob on this amp to get you some good quality high gain sound. If you are used to a 5150, or a Dual Rectifier, then you are used to your amp providing all of you high gain sound. As stated earlier, this amp will be a little inarticulate once the gain knob goes past about 1 o'clock. Fortunately, a while back I discovered that i liked the tone of my high gain sound better if I turned my lead channel gain down to a lower setting, and pushed the input with an overdrive pedal. That is what you have to do with this amp to get a good quality sound on a higher gain setting. I've used a Tube Screamer TS-9 that I converted to a TS-808 into the front of the SE30 with some very good results. My lead gain knob is set at about 9:30, and my TS is set Drive and level at about 1 o'clock, and tone at about 10 o'clock. With these settings, I can adjust my channel gain slightly up, but not past 11 o'clock with very good results. I also built a GGG ITS8 "very expensive boutique mod" pedal (think Landgraff Dynamic Overdrive), and that works even better in front of the SE30. I can set my channel gain lower, and let the pedal do more of the work. It sounds best when using the LED clipping on the pedal.
Aside from running an overdrive in front, if you use these general rules, I think you will end up with a good sound through the high gain side.
1) Never turn your Treble higher than your Mids.
2) Never turn your Bass up past 12 o'clock
3) If you want a "Scooped Mids" amp, you probably should have bought a different amp. This will produce outstanding tone if you are patient, but won't neccessarily produce tons of gain.
I should mention that I have experimented with using my clean channel as a high gain rythym channel, and using the lead channel as, well, a lead channel. I just turn the channel volume up on the clean channel, and adjust my "boutique" pedal to taste, then set the channel volume on my lead channel very low. This way, I can leave my pedal on while I change channels for leads. This is very effective. The master for the clean channel will be set low, and the lead channel master will be turned up to the desired level to boost above the band. Very nice sound for classic rock.
I think alot of guys are premature in writing off this amp. There are a lot of amps out there that sound pretty good at any setting, and you have to tweak them to optimize them to the sound you want. I will have to say that this amp is quite the opposite. You really have to drill down to the setting that is right for your guitar, and type of music. I do have to say that once you figure it out, you will be glad you stuck with it. The settings are sort of non-standard too. You set most amps to 12 o'clock to start. I would say on this amp, you should set everyting to 10 o'clock to start. It's also very bass and treble heavy, unlike many other amps where you have to pull some mids out, you probably want to add some in on this one.
Just one more parting thought. This amp wants to be played at stage volume with the masters up at least past 12 o'clock before it starts to really sound good. If you are sitting in your house trying to play this at bedroom levels, you will probably never achieve the potential this amp has to offer. It will not sound good to you until the Master volumes approach 12 o'clock. This is an amp that wants to be played out with a band and turned up.