Onwe weekend I tri-amped the K's with a 700 on the woofs, a 400 on the mids and a sweet little Kenwood integrated on the tweets, a 700 on the D9's, and a 400 on each pair of Heresies I had at the time. The heresies were on top of the horns, the D9's right in front. It was as loud as anything I've heard in a home environment. The police and I were in dis agreement on the SPL's though. I got an SPL meter from the Larrt soon after but never had that combination to duplicate that again. One pair of Heresies went to my Son, the other to my nephew and the D9's are 8 miles west of town in a Bud's system.