Just a word of caution: if the output of the amplifier is connected as a bridge, it means both speaker wires are driven. The schematic I gave will still work if driven from the pre-amplifier stages but if you drive it from the loudspeaker wires, make sure the ground of the power source is isolated. If you do not, it would short one of the speaker wires to ground and possibly damage the amplifier. It is doubly important if you try to drive it from the loudspeaker wires from two channels.
The alternative is to use a small audio isolating transformer at the signal input so the loudspeaker wires have no direct connection to anything else.
As I stated, if you connect it to the pre-amplifier output (before the volume control) it will still work as it is.
Brian.
Absolutely NOT!!
Your port tube is much too long. Maybe your resonator program is for a tube that has one end closed, not for a speaker vent.
I looked on Pyle's website and found an 8" "Premium" subwoofer speaker rated at 500 Whats. It looks cheap. They provide no detailed spec's. They say its frequency response is 55Hz to 6kHz but do not say the important enclosure type, size and +-dB variation. 55Hz is not a subwoofer cutoff frequency anyway and might be at -12dB.
I have an unusable speaker enclosure design program but it does not work on my Windows 10.
Here is a typical half-decent Scanspeak 8" woofer that also does not have detailed spec's but they show details for 3 enclosures. A 1.5 cubic foot enclosure has a port tube that is 2" diameter and is 5" long. The resulting low end -3dB cutoff frequency is 42Hz.
It is called Boxplot and it was free but today it costs $25.00US +sh and h. There is a shareware version today that has a free demo: https://www.diamondcut.com/boxplot.htmAG can you send me the program.
I think in a huge enclosure (infinite baffle?) it will reach its maximum excursion limits when playing 20Hz to 30Hz at a fairly low power.THis is an excellent little speaker. Notice that the free resonant f= 30Hz and all 3 designs raise the resonant frequency, so one can imagine that a significantly larger box is needed to extend the bass with a resonance below 30 Hz and stay away from the same f.
It is called Boxplot and it was free but today it costs $25.00US +sh and h. There is a shareware version today that has a free demo: https://www.diamondcut.com/boxplot.htm
I think in a huge enclosure (infinite baffle?) it will reach its maximum excursion limits when playing 20Hz to 30Hz at a fairly low power.
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