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I recently built a pair of sonosubs and here's the thread on them. From the outside, I was bent on designing a pair of subs to be used for music only, with the possibility of watching a movie once in a while. ( for second room )
Crossover <60 hz, closer to 50hz or less, depending on how the actual response was in room. Maximum enclosure volume possible with a large port for a few reasons. Large diameter port for low port velocity as well as linearity. I decided on 18 inch sonotube, and originally was set to build just under 9 cu ft net, 10cu ft before port and driver.
I estimated the outer diameter of a port, without having it on hand. DOH... as it was, I had to drive 75 miles to pick up sono and MDF, and a second trip was for a port and a few other odds and ends.
I had already cut the 18" sono ( actual inside measurement ) into two pieces 70 5/8" long, painted the outside of them with acrylic latex paint and cut endcaps before getting a chunk of 8" OD sono for the port. Never trust a label, measure it for yourself, lesson learned. And to think I was an aisle away from the tape measures... :sarcastic:
It actually worked out maybe a tad better, the port velocity was a bit higher but the port resonance was pushed up a bit more than 2 octaves above the intended crossover point.... 250hz.
Crossover <60 hz, closer to 50hz or less, depending on how the actual response was in room. Maximum enclosure volume possible with a large port for a few reasons. Large diameter port for low port velocity as well as linearity. I decided on 18 inch sonotube, and originally was set to build just under 9 cu ft net, 10cu ft before port and driver.
I estimated the outer diameter of a port, without having it on hand. DOH... as it was, I had to drive 75 miles to pick up sono and MDF, and a second trip was for a port and a few other odds and ends.
I had already cut the 18" sono ( actual inside measurement ) into two pieces 70 5/8" long, painted the outside of them with acrylic latex paint and cut endcaps before getting a chunk of 8" OD sono for the port. Never trust a label, measure it for yourself, lesson learned. And to think I was an aisle away from the tape measures... :sarcastic:
It actually worked out maybe a tad better, the port velocity was a bit higher but the port resonance was pushed up a bit more than 2 octaves above the intended crossover point.... 250hz.
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