I get lows from it even with a sia3500 on it. It allows me to play whatever I want. Dub, r and b, hip hop, all that... I did have the subsonic set too low. So I did some patch work on it but it still hits and still is musical. For a daily setup that people down here think it's a Tahoe coming down the ave, I gotta say Buck did his thing when designing this box. When I decide to up the power I'll report back. Probably once PSI is open to parts orders again.
Buck thanks again we'll do more business in the future
I think when you get a half bridge amp that this box will really shine. That box is built for high power + large airspace 15, so a half bridge will put out more power across the usable bandwidth and probably increase the usable bandwidth, where you can probably lower your subsonic a little more, but maybe depends on overall wattage applied at that point. I'm really glad that it worked for you. Hopefully now I can continue to understand the new-to-me type of enclosure that we made. I would imagine that someone has done that before, being how similar it is, in a way, to the ABC boxes. The technical name of your box there is still not known to me
With woofers that are higher powered and require a lot of port area, the port has to be extremely long to be tuned low, starting around the mid to high 20 Hz range. Somewhere around that low Hz range is where high powered ported boxes start running into ports being absurdly long. It's funny, because typically the biggest port area I use, the lowest you can usually tune it to is 28 Hz, which is usually the absolute lowest for any normal daily-ish system that I do. You start getting into the port being so long that the port starts acting like a transmission line itself, creating (potentially) an unwanted/unpredictable loading/resistance at that too-long-of-port-length-related-resonance. So, that's sometimes why people with high power will do a series 6th order bandpass for bass that's super low, say mid 20's and below, because the port areas needed and port lengths in a series 6th allows you to avoid both the extra-long port situation AND helps dampen any potential port noise from an under-sized rear port, which allows you to make series 6th orders do almost whatever you want or need them to do.
The problem: Series 6th order bandpasses are massive compared to ported box sizes for the same woofers. That's part of why I wanted to try this specific style of enclosure. I can tune extremely low with this style of enclosure, with 2 ported chambers and the sub firing into the environment like a ported box, and your box is only a little bit bigger than the largest ported box could be for your 15. A series 6th order for that woofer would be about double the size of your box now. That's the advantage to this style is being able to tune super low and have super big port area to avoid port noise and frequency related restrictions to airflow with higher power, but doing so without running into potentially problematic port resonances related to port length. You also get some boost to some higher frequencies that is totally calculated to help boost and sync in with the larger chamber.
There's definitely some situations where I could've used this type of box in the past, where some people have more than enough room to do ported, but didn't have enough room to do a full bandpass. This is a really good middle-ground between a ported and series 6th order bandpass, IMO.
