Diamond Dog
The Signature 3's have good bass, plentiful, but on my system it did not sound quite as tight and clean as the Alpha Goertz.
The Signature 3's are reallllly good, I could see how some people would like the sound of the Signature 3's better.
I just prefer the Alpha on the low end a bit more.
Also My Signature 3's are only 4' long. So, I don't know if this affected the base somewhat.