I spoke with Dave at Avatar yesterday on the phone. I asked him how low of a frequency his B210 cab can reach. He said that he never checked but insisted that it has no problem faithfully reproducing a low B on a 5-string or a low A. He knew that the Foster horns hit 16,000 hz but didn't know about the lows? In comparing the Carvin BXRs it says the 2X10 gets down to 28hz and the 4X10 gets down to 26hz. Even their Br 1X18 only gets down to 30hz. Thus: Their lowest frequency-producing cab is their BRX 4X10. The 4X10 cab is 18" deep. The 2X10 cab is only 15" deep. A number of members of TB had a hard time convincing me that a 2X10 or 4X10 cab can hit the lows without a 1X15 or 1X18 cab to support it. I am convinced based upon Carvins tech specs that the Talk bass posters were right. I had a hard time believing it based on personal experience as I used to have a 4X10. And I saw the Alan Parsons Project's bass player use a 4X10 cab only on stage and he definitely needed more lows. I was in the 2nd row about 20 feet in front of his rig. Small venue. He was very talented but the bottom wasn't there. It could be that I may not have ever had it dial in right. However, I would think Alan Parsons' bass player would know how. The keyboard amps, incidently, produced the absolute lowest notes for Alan. My second concern is about Avatar not knowing how low they can go. I bought a 4X10 and a 1X15 from Avatar in about 2005 along with a Hartke 550 watt amp without knowing numbers. I'd rate that rig at a "B/B-":scowl:. I'm bothered by unknown low frequency numers? Does Dave not know. I understand that he is greatly respected here at TalkBass. I might still go with him. He doesn't like Carvin's China drivers. I certainly like the recommendation of Eminence USA made speakers. Dave also said that there is no difference between his neo speakers -vs- his ceramic speakers other than weight and the fact that the ceramics can handle more power and heat. He recommends his ceramics for the cash savings and increased power handling if a sore back isn't an issue.