[haraldo]

Looking at what subwoofer manufacturer REL calls ARM (Acoustic Resistive Matrix).... I have no idea how this works and how it's actually configured, other than it's a series of differently tuned enclosures..... They say it's kind of like a transmission line....

From what I have read this configuration will go lower by a considerable amount, without negative effects or reduction of SPL capabilities compared to, say, a regular ported cabinet. (Although I have never heard the Stentor or Studio)

Does anybody know what ARM is really about?

Most importantly, does anybody have any schematics, and how to tune such an enclosure for a DIY project?.

Regards

Harald N