If you turn off the horns, a pair of 410HEs will sound very close to an 810E. Same driver and the tuning is close/or identical depending upon who you believe. I already posted the specs, the -3db point for the 410 is 2hz higher than the 810E, but perhaps coupling between two cabs would equalize the low end. IMHO make the decision upon which form factor will better suit your loading situation. Here's a TB argument you might enjoy 410He + 410He = 810E? As we are talking specifically about the SVT...it is designed to run into 4 or 2 ohms so I will not advise you to run a single 8 ohm 410HE with this amp, especially if you are pushing the amp to it's power limits. Those in the know, will tell you to get the Heritage 810 because it has upgraded drives that sound better. The Heritage SVT is also reportedly a bit quieter (less hum). Despite the SVT/810E being an industry standard, I rarely see them. They are by no means ubiquitous. On the few occasions when I was presented an SVT/810E in a backline, I opted to use my own rig: rack mixer->power amp->Eden 210XLT. The SVT/810E, IMHO, is not the right sound for the variety of music I typically play. I often switch between string and electric bass. Now if I were in a U2 tribute band, I would be all over the SVT/810E. IMHO, you really should try out the SVT/810 package before you buy...don't make the same mistake I did and buy the amp without a demo. I have seen them at Guitar Center on a fairly regular basis.