I am not sure if anyone will come away with anything different from what I am going to say here from what others who listened to these subs have said.
I have now listened to multiple offerings from Rythmik and JTR and most of them in my room. The design goals for both have been different from the start but got a bit closer with paper cone offering from Rythmik which was great while maintaining the Rythmik sound signature.
Going into the session yesterday I had just heard a 12-inch sealed aluminum driver offering in Enrico’s house and based on all the things I had heard about the aluminum driver, I was ready for a non-contest comparison in the TR department against the Cap 2400. The first thing that surprised me was the TR from the aluminum drivers, I was not expecting that level of TR from them and they sound fantastic. I really appreciated the clarity in the bass and nuances of all the different bass octaves that I could pick out. The FV25HP sounded deep, clean, punchy with a lot of TR. For gunshots the FV25HP was hard to beat. The driver stops on a dime and results in precise hits. The deep music sounded fantastic on the FV25HP, no port noise whatsoever. The lack of port noise on the FV25HP seems to be a factor of Servo as well as the larger port area that FV25HP has compared to the 2400.
I find the same thing in my FV18s, these subs own scenes like the pulse server room and EoT and suck my bass type music. Due to the cleanliness of the bass the subs are stealthy, you don’t realize the kind of bass being produced till you break something on a shelf or your room fixtures and windows start complaining. To me the FV25HP sounded a lot closer to my paper cone FV18 than I expected as well as to the 2400 in TR.
As others have said the FV25HP is really inert due to the MDF construction, even when pushing the sub, I placed my hand on the cabinet and there were minimal vibrations. I can understand now why Brian likes MDF vs birch or other material. I can also see that in a room like mine some of that cabinet resonance could be a contributor to lack of clarity I heard coupled with long decay times from a high excursion driver.
The flexibility of the Rythmik amp has grown on me with time once I understood what each function did and how I could use them to tailor the sound to what I like. I was one of those who were intimidated by the Rythmik amp options but now appreciate having them rather than not.
Even though I own Rythmik subs now, I have a soft spot for Todd’s subs as listening to the weight in the bass form his subs is what made be realize what I was missing from my PSA subs and started my search again. I have heard the Cap 2400 a few times now in Todd’s room and once in mine. The driver used in the 2400 does have a distinct think and full sound signature. Even on the Audy pings the JTR driver sounds different than any other driver I have heard including PSA, SVS, Rythmik, and Seaton. The latter sound more like each other, the JTR on its own. It is this driver that makes the JTR a better performer in open rooms than small rooms on suspended floors. The higher excursion driver with longer decay times, more floor resonance on a suspended floor due to the higher excursion and some cabinet resonance could all contribute to the lack of clarity compared to the FV25HP especially in a small room on a suspended floor but perhaps to some degree in a large room. The Cap 2400 sounded a bit one note bass versus the nuances of the bass in the FV25HP.
The 2400 did fill the room well as we had observed in the GTG, and bass did not seem localized. The JTR is brute force and violence is the only description that fits its behavior. I had observed similar characteristics in the 118HT, it was violent as well but without the thick sound texture of the driver employed in the 2400 and other JTR subs.
The excursion on the 2400 is one to marvel for sure. It is almost mesmerizing and hypnotic. That immense excursion contributed to the port noise we heard on some material from the 2400. The port noise was not offensive and as others have said is likely to not be there when running dual subs and playing normal content at normal levels.
There certainly seem to be some material where I would favor the Rythmik and others where I would favor the 2400. I agree these are stellar subs and one could not go wrong with either. The 2400 does have the edge in TR in comparison but since my expectations were so low for the FV25HP’s TR that I was shocked by how much it did have. I won’t say that it is at the level of the 2400 but difference was not as much as I had expected. The 2400 makes its presence known all the time, its hard to ignore, the FV25HP would just jump you when not ready. Some may like one or the other.
Best way to know what you like is to bite the bullet and demo them in your home. The room and set up will make all the difference between how these subs perform. The Rythmik subs do seem to have a very good native FR as we found in my room as well as Todd’s but the floor construction, placement options, and listening preferences etc will inform your decision on what you find better in your room. For me I know now that the JTR driver does not work in my room for reasons explained above, the 118HT sounded great but the 2400 and 1400 did not.
If some one is looking to buy this level of subs, do yourself a favor and get a UMIK and REW and make sure you know why you are hearing something the way you are hearing it. Spending this much on sub and not really understanding your room is a waste of money IMO. No level of sub will compensate for poor placement.
I feel very fortunate to have been able to listen to these outstanding subs not once but multiple times now. Brian and Jeff are one of the nicest guys you could meet, passionate about their products, inventors and open to feedback and cater to their customers. Kudos Brian and Jeff, I am excited to see what you both produce next (I am not in a hurry by the way)