Series tuned 6th order bandpass experiment

[Jman9112]

So if you tuned the rear chamber at say, 20hz, and the front ended up around 40, would it hit low lows like a boss or would it still roll off as quickly as the ones you guys profiled?

The rate at which output rolls off is going to stay fairly constant, the frequency at which it starts can be moved around to where you want by changing the chamber's tuning frequencies. Realistically you can get about one octave of good output before things start rolling off, so 20-40 Hz or 30-60 hz, etc. So in your case, you could tune to 20 & 40 hz (at least in theory) and kill the lows, but output is going to roll off pretty fast above 40 Hz.

Another thing to keep in mind, its not always possible to get what you want with series tuned boxes. You may want to tune to 20 and 40 Hz, but it may not be physically possible using the chamber volumes and port area you want to. Its just the way it is due to the interaction between the ports.

So basically, just use a regular low tuned bass reflex? E.g. 2 12s in 5ft3 with a massive and long port tuned to like 26 or something would be better suited for a reliable daily bumper?

[Triticum Agricolam]

So basically, just use a regular low tuned bass reflex? E.g. 2 12s in 5ft3 with a massive and long port tuned to like 26 or something would be better suited for a reliable daily bumper?

Well it just depends on what you are trying to accomplish. A 6th order bandpass box is not going to get you louder than an equally sized ported box, period. What it may be able to do is get you broader bandwidth and less peaky frequency response while keeping efficiency very similar to a regular ported box, but it will most likely come at the expense of increased size and complexity.