There’s a thread around here detailing how I came to build this particular sub. I got lot’s of help from MikeP and from reading the threads.
I have size constraints and this box (2.77 ft.) is the largest that will fit where it has to go. The $300 budget explains most of the rest. The mix is 50/50 HT/music. I wanted something that was not straining to play at 75dB with room for a 30 dB pop from special effects.
It was going to be a 20Hz tune until I noticed a discrepancy in the T/S numbers between Dayton and PE. Now, it's closer to 22Hz.
Dayton Spec PE Spec
Le: 3.17 Hz 2.5
Fs: 22.2 Hz 25
Vas: 2.61 cu. ft. 2.27
Qms: 6.12 7.03
PE checked it out and said their specs are correct. Apparently Dayton has not updated in some time. A friend is building the box and all the parts were cut to size based on Dayton specs. I had to just live with the result.
I managed to have the port length adjusted, but not the area. It could get chuffy at high SPLs and low Hz. I don’t think it will make much difference in normal use.
The photo should explain the box construction. I’m using a folded, square port and a Dayton 240W plate amp.
I have size constraints and this box (2.77 ft.) is the largest that will fit where it has to go. The $300 budget explains most of the rest. The mix is 50/50 HT/music. I wanted something that was not straining to play at 75dB with room for a 30 dB pop from special effects.
It was going to be a 20Hz tune until I noticed a discrepancy in the T/S numbers between Dayton and PE. Now, it's closer to 22Hz.
Dayton Spec PE Spec
Le: 3.17 Hz 2.5
Fs: 22.2 Hz 25
Vas: 2.61 cu. ft. 2.27
Qms: 6.12 7.03
PE checked it out and said their specs are correct. Apparently Dayton has not updated in some time. A friend is building the box and all the parts were cut to size based on Dayton specs. I had to just live with the result.
I managed to have the port length adjusted, but not the area. It could get chuffy at high SPLs and low Hz. I don’t think it will make much difference in normal use.
The photo should explain the box construction. I’m using a folded, square port and a Dayton 240W plate amp.
