I'm using an older Mirage BPS-400 and a newer HSU VTF-15H MK2 Subwoofer with my 4 Pendragon's. Properly set-up they should not bring attention to themselves. I like the HSU subwoofers and their products are a great value for the money. They have a very loyal customer following. I looked at many subs that are 3 or 4 times the price but I doubt they are 3 or 4 times better. Maybe, 5 to 10 percent if that. If that last 5 or so percent is important to you or you have lots of disposable income go for the higher priced spread. I would guess Eric's subs are a good value for the money. Paul McGowan of PS audio has a great video on subs here:I am enjoying my Double Impact speaker a lot. Does anyone own or have heard Tekton Subwoofers? I am thinking of adding a subwoofer, but am not sure if I should look at SVS or Tekton.
http://www.psaudio.com/askpaul/the-lowdown-on-subwoofers/