Best type of Sub to consider?

What’d I tell ya Kenny! Being a dipole, the OB sub has a null to each side, creating two benefits: First, it loads the depth dimension of the room, but not the width, exciting the longer, further apart nodes rather than the shorter, closer together one’s. Already you have gotten rid of one source of room boom. Second, the side nulls allow the OB sub to be placed right next to your main speakers should you wish to, or right up against a side wall if you have a narrow room. True, it has to be away from the wall behind it (like any dipole), but most speakers sound better there too. And here’s a bonus: the sub can be laid on it’s side and used as a base for a pair Quad ESL’s or other short speakers. That’s just what the Gradient OB/Dipole Sub made for the Quad 63 was. The difference here is that you have the much higher quality GR Research 12’ woofer, and the Rythmik Direct Servo-Feedback system controlling the dual woofers. As I said, a very special sub, one few people have heard but when do are blown away by.

By the way, you can see a pic of the OB/Dipole Sub in the current thread about Virtual Systems.

Hi Bill. No, the only paper cone is the 12. The reason for that is that it is more of a GR Research product than a Rythmik one. The two companies and their owners have a unique working relationship. Brian was already offering the Rythmik products, and that’s what drew Danny to him, specifically with the intent of collaborating on Danny’s idea for the OB/Dipole sub. The sub is really Danny’s baby, and he prefers paper cones. The 12" aluminum cone version is all Brian’s, the paper version being exactly the same (with one exception---read on) but for the cone, which Danny finalized the parameters on. One can buy an F12 with either the paper or aluminum cone, sealed only.

There are two versions of the 12" paper cone woofer: the first is for use in a sealed or ported "normal" sub. The second is one whose parameters have been optimized for Open Baffle or Infinite Baffle use. You cannot use a regular woofer in those two applications, nor an OB/IB woofer sealed or ported. The free air resonant characteristics and other specs are not the same, and the two woofers cannot be used interchangeably.