Hi, I have gotten my hands on a pair sub boxes for 15" speakers made from 19mm MDF fiber wood. I also have a pair of RCF L15P540 drivers.
I would like to create a pair of PA sub woofers I can use as a component set, together with a pair of full range PA speakers.
The boxes are rectangular of outer size: hight: 59cm, width: 54cm and height: 45,5cm. This gives a total volume of around 123 liters as far as I can calculate. The driver hole is made at the front in the middle almost. The boxes are not vented right now, however I would like to add bass reflex ports - I think. The boxes are sealed but not reinforced/stiffened internally.
https://docs.google.com/drawings/d/1Hawkd6yeW8n0hfWEnCAvnZXvZLqZ6DF8LSJwEcn4K4g/edit?usp=sharing
Now comes the big question, are these boxes at all suitable for a pair of ported subwoofers for the drivers I have at hand?
If so, what size of ports should I use?, How heavily would you dampen the speakers with dampening material?
If the boxes are not straight suitable, can I modify (make the boxes smaller) to better fix the drivers?
I would like to create a pair of PA sub woofers I can use as a component set, together with a pair of full range PA speakers.
The boxes are rectangular of outer size: hight: 59cm, width: 54cm and height: 45,5cm. This gives a total volume of around 123 liters as far as I can calculate. The driver hole is made at the front in the middle almost. The boxes are not vented right now, however I would like to add bass reflex ports - I think. The boxes are sealed but not reinforced/stiffened internally.
https://docs.google.com/drawings/d/1Hawkd6yeW8n0hfWEnCAvnZXvZLqZ6DF8LSJwEcn4K4g/edit?usp=sharing
Now comes the big question, are these boxes at all suitable for a pair of ported subwoofers for the drivers I have at hand?
If so, what size of ports should I use?, How heavily would you dampen the speakers with dampening material?
If the boxes are not straight suitable, can I modify (make the boxes smaller) to better fix the drivers?
Now, the internal dims are???, measure the thickness to get net volume of the enclosure for more acurate calculations. Anyway, anything between 90-160 liters should be fine.
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Hey, the outer dimensions are as listed and the thickness is 19mm as stated this sums up to 123 liters of net volume.
Adding 2 round ports, PVC tube 10 cm diameter, 5 to 10 cm long, would suit the L15P540. You could also add 3 ports at least 10 cm long.
Best regards Johan
Best regards Johan
Hi,
I rather like those RCF drivers. Had one in a Tannoy T40 cabinet, and it sounded really nice. 40Hz with authority from a single 15" in a 100L box was a nice thing to have. Unfortunately, I burnt it with an oversized amp (600w) and a compressor. Stupid...
Anyway.
123L net will probably give you 100L internal volume to play with. There's not a lot of Xmax to play with, so you could probably get away with a pair of 4" ports, tuned for 35Hz. You can use WinISD or Hornresp to calculate the port lengths.
Make sure you've set a high-pass filter below that to stop them bottoming out.
Hope this helps
Chris
I rather like those RCF drivers. Had one in a Tannoy T40 cabinet, and it sounded really nice. 40Hz with authority from a single 15" in a 100L box was a nice thing to have. Unfortunately, I burnt it with an oversized amp (600w) and a compressor. Stupid...
Anyway.
123L net will probably give you 100L internal volume to play with. There's not a lot of Xmax to play with, so you could probably get away with a pair of 4" ports, tuned for 35Hz. You can use WinISD or Hornresp to calculate the port lengths.
Make sure you've set a high-pass filter below that to stop them bottoming out.
Hope this helps
Chris
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