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In Reply to: RE: Would Someone Be Willing posted by tubav on November 29, 2020 at 17:59:10
There was a free old program call Bass Box that used those specs to calculate box dimensions. It also had about a thousand preloaded driver specs you could put up.
I'll have to see if it's still around.
Otherwise start with this one.
Follow Ups:
Thanks. I was able to figure it out a little. I'm a woodworker and pretty slow on the design aspect. My box is already built and is about 27 lts. I plugged in the parameters and 1 driver needs 20 lts. so 2 drivers would need 40 lts. correct? If that's correct then my box is too small for 2 drivers. I'll start by unhooking one of the drivers and see if that's more to my liking by listening. A good way to start?
In a 27 liter box, you could try tuning to somewhere in the 45-50 Hz ballpark. A 2" diameter port, 2" long, gives a calculated tuning frequency of 48 Hz. The calculated -3 dB point looks like about 53 Hz.
These calculations depend on the specs being accurate, and say nothing about the frequency response elsewhere in the spectrum.
Duke
Me being a dealer makes you leery?? It gets worse... I'm a manufacturer too.
I suspect that you're looking for bass reinforcement using two 5.25" drivers? since your cabinet is built but you're not really approaching the project with a specific design path, perhaps a passive radiator might get you closer to where you want to end up ... you've mentioned you have several of those RS drivers and one might do OK service in that role
or pop for a pair of real ones from PE ... not too expensive to cause any 'mission creep' regrets
on the other hand I seem to remember Steve Brown, who posts here from time to time, knocking together a project using those very drivers some time ago ... maybe search the asylum and see if you can get insight from his posts
regards,
Looks interesting.
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
I'm reverse engineering but basically trying to salvage a project. My boxes are built and if I did the box calcs correctly my box is way too small for 2 of these drivers. Trying to save money and use what I had on hand. It doesn't sound like I'd like. DUH! I always have to learn the hard way.
Ah. OK.
When you say the 2 drivers are side firing, magnet to magnet, they are physically on opposite sides of the cabinet, firing outward?
The push pull design would just be reversing the wires on one of the speakers. So one fires out while the other in. Worth a try.
But yeah, the box is probably too small.
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
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