I'm looking for advice on considerations I should make when repurposing some items as speaker boxes.
Right now I am most concerned about selecting proper Vas and Qts. Is there a way to size this from the box size? I've only seen the reverse: box sized from these values.
For instance, last night I was trying my hand at this. The container interior dimenstions are 8.75"Wx11.7"Hx6.5?"D for a total of 0.385 cu ft (10.904 cu L). The front has room for ~5" cut out and a 1.5" tweeter cutout. The back I was going to replace (pegboard like holes) and either vent and/or put a (sub)woofer in.
Rightly or wrongly, I converted the Parts-Express woofer selection guide into a pivot table so I could sort and filter on Vented Volume, F3, Cutout, W_RMS and SPL.
I started with woofer
Tang Band 6.5" 4ohm w/ 50W RMS, 83 db SPL, 38Hz F3_vent @ 0.33 cu ft.
Tang Band 6.5" | 4ohm| 50W RMS| 83db SPL| 38Hz F3_vent @ 0.33 cu ft.
Filtering on box vol and cutout, I added this mid-woofer:
Tang Band 5.25"| 8ohm| 28W RMS| 88db SPL| 73Hz F3_vent @ 0.27 cu ft
Am I on the right track?
Right now I am most concerned about selecting proper Vas and Qts. Is there a way to size this from the box size? I've only seen the reverse: box sized from these values.
For instance, last night I was trying my hand at this. The container interior dimenstions are 8.75"Wx11.7"Hx6.5?"D for a total of 0.385 cu ft (10.904 cu L). The front has room for ~5" cut out and a 1.5" tweeter cutout. The back I was going to replace (pegboard like holes) and either vent and/or put a (sub)woofer in.
Rightly or wrongly, I converted the Parts-Express woofer selection guide into a pivot table so I could sort and filter on Vented Volume, F3, Cutout, W_RMS and SPL.
I started with woofer
Tang Band 6.5" 4ohm w/ 50W RMS, 83 db SPL, 38Hz F3_vent @ 0.33 cu ft.
Tang Band 6.5" | 4ohm| 50W RMS| 83db SPL| 38Hz F3_vent @ 0.33 cu ft.
Filtering on box vol and cutout, I added this mid-woofer:
Tang Band 5.25"| 8ohm| 28W RMS| 88db SPL| 73Hz F3_vent @ 0.27 cu ft
Am I on the right track?
If we take the woofer as the example, its recommended vented volume is 0.33 cu ft, which is a close match for your 0.39 cu ft salvaged box.
This is one (crude) way of matching a driver to an existing enclosure. Is this what you want to know?
P.S. The slight overvolume (~ 15% in this case) of the salvaged box is acceptable. Vented boxes often need a bit extra volume to compensate for unpredictable internal losses.
This is one (crude) way of matching a driver to an existing enclosure. Is this what you want to know?
P.S. The slight overvolume (~ 15% in this case) of the salvaged box is acceptable. Vented boxes often need a bit extra volume to compensate for unpredictable internal losses.
Are the existing cabinets so special (the pegboard like back makes me wonder) that they are actually worth designing around?