Alan

Couldn't agree more. In an industry so filled with hype and unsubstantiated claims it's nice to hear the NRC credo (i.e. technical design should be driven by empirically verifiable AUDIBLE improvements ).

In a similar vein I recently posted to a very technically oriented audio board about what measurable parameters (e.g. distortion, transient response, group delay etc.) really produce audible improvements in subwoofers. It didn't generate any replies! I was really hoping I could get some guidance on what type of design to use for my current subwoofer project - sealed, ported, push-pull, isobaric???

Hasn't NRC done any testing on this?

Anyhow, what I really wanted to know is what do you think about your M60s?

thanks
peter