Hi everyone, I ordered the Tantra 1000W Ampmodul. The amp arrived a month ago, and I am still very impressed. The Bass Sound is huge. You can hear every tone in every range. Even without the EQ the bass sounds awesome. I'm thrilled with the various opportunities regarding the EQ, drive and the the filters. The compressor and the harmonics are the best addition to the amplifier. The bass sound just as it should sound. I tried it with an 4x10 Ampeg SVT-410 HLF with many different bass guitars (G&L L-2500, Sandberg VM5, Sandberg Panther 5 Fretless, Ibanez Ashula...) . It sounded huge on a big stage and you can feel and hear every note. I tested a lot of amplifiers and none have thrilled me like Tantra yet both live and in the studio. In addition to the quality of the amplifier itself, customer service should also be mentioned. Boris was available to me at all times and I got an answer to every question as once in the days of a professor of electrical engineering.