Here is my review of the SVT 2 PRO off of harmonycentral.com. By the way, the "Drive" knob on the 2 PRO creates the same growl you get out of the power tubes, just not the volume change. So you can get the power tube growl at lower volumes and thus control your stage volume better when playing live. Plus, the Drive knob is interacting more with the Driver tubes (3 x 12Au7) not as much with the 5 x 12AX7 pream tubes
Sound Quality: 10
The unit can do Slap, Reggae, RAP, Pop, Rock, Metal, Country, Jazz, Solo stuff.... The sound is quite amazing- I am using this amp with an Ampeg 810e, a Spector Euro 5 and a Warwick Corvette 5. I can dial up any type of midrange sound I desire with the 2 PRO. With the Spector, I can dial up a smoothe punchy sound with plenty of high end. The Warwick (known for the awesome growl) turns into a monster on the 2 PRO! Punchy/growly, low and full of high end. The best part about this amp is the Drive control. Here is the secret of the 2 PRO- the SVT Classic has the awesome tube growl in it as you turn the volume up. The 2 PRO allows you to have the growl at lower volumes and allows even more growl at higher volumes. When the Classic starts overdriving the tubes, certain mid and low frequencies "drop out" of your bass sound. The 2PRO has the exact same thing happen, but, the Equalizer allows you to dial the lost frequencies back in. So you can have a growly/overdriven, full sound at high volumes!
The unit is %@#^***&!$@ LOUD!! I used to use a QSC PLX 2402 and a Aguilar DB 680 before the 2 PRO. No comparison! The 2 PRO sounds better and is much louder than the lousy QSC amp. The low end from the 2 PRO going into the 810e is UNREAL! I never knew my 810e could go so low! The high end is great and the amp is overall very responsive. Excellent Low end, Very punchy if you want it, and awesome growl! I never thought I would like tube overdrive and tube growl in my sound, but now I love it! I had the Master on 7, my bass tuned to ADGCF, and the drive control at 8, what a menacing sound! I had destructive lows, smoothe punch, massive growl and defined high end all at the same time! When I tried Slapping, I was amazed by how good it sounded! I was able to keep the growl somewhat subdued and retain definition with all of my slap notes. Very cool slap sound. This unit has excellent variety of tones. From smoothe and punchy, to growly and mean, this thing kicks ASS! The volume of the 2 PRO could crush 2 guitarists and a drummer. Last thing, this unit sounds better as you turn the volume up. This unit requires earplugs at those volumes (according to me), make sure you wear them! Finally, this unit achieves the same growly tone of the SVT-Classic, but the 2 PRO can control it better and make it even more insane, if needed.