Nice, thank you, once you are musician you ear is better then mine and in general more capable to detect small nuances in the sound. All frequencies were triggered at the same time once you hit the string, so if the fundamental delay in the box reproduction it should bring small change in the sound making harmonics arriving earlier compared to the fundamental, but if you didn't notice difference in the overall sound it might not be a real issue.
Low pass filter used to protect driver excursion will also increase a lot the delay, did you tested with LPF?
What I'm trying to do for my next personal box is to lower even more the tuning frequency of the vent so it will be out of my intended bandwidth and it will be used only for heat transfer.
Yet, there are a bunch of 50hz SUBwoofer designs in the SUBwoofer forum!
Let's call them Bass Bins if they are not reaching 30hz.
I assume you meant a HPF to protect driver excursion? If so, yes. All my playing has been with a 45hz 24db/oct HPF, although this was turned off for the group delay measurement.
For my use (bass guitar), I cannot notice any delay.
However when the same techniques are often used to squeeze 50hz performance out of one driver and 30hz performance out of another, I don't think it's especially important to be pedantic about it.
I couldn’t resist, and had to make your idea a reality. It’s a three way box now
After much stuffing around with inductors, capacitors and resistors, and a little bit of gentle eq, I have an extremely Hifi bass guitar cab and a not so Hifi full range cab.
The hump at 80hz is very well positioned for bass guitar, and I have to say that this is one of the better sounding bass cabs of the 20 or so I have built of the years. It’s fairly bloody loud, too!
Great work.
I'm jealous to build mine too but it will take more time to became a reality.
Additional suggestion: Think about replacing the P10 connector with a Speakon one, it will save you from headaches.
It actually has dual speakons and dual P10 connectors.
The low end has one speakon and P10, the mid/highs the other two
There's some method in the madness. I wanted optional biamp capability, but I did not want the risk of feeding two amps into the one channel by forgetting to flick a switch.
I made a short P10 jumper cable that can jumper one speakon to the other when using a single amp. For biamping, there's a very obvious change to make (ie pulling out a jumper cable), that I'm hopeful has made it idiot proof.
@BP1Fanatic as much fun as this build has been...