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Would Someone Be Willing

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Posted on November 29, 2020 at 17:59:10
tubav
Audiophile

Posts: 510
Joined: March 21, 2009
To run these specs on the old RS 40-1354 and come up with cab dimensions and vent size. I'm using two drivers magnet to magnet, side firing and using them for LF duty. Any suggestions on stuffing would be great. I was gifted with a small stash of these and want to do something with them. No knowledge of design software. Thanks for any help you can give.
Specs that I can find:
RE = 7.09 ohm
f0 = 56.0 Hz
SD = 0.0083 m^2
Mmc = 6.16 g
QM = 3.46
QE = 0.537
QT = 0.46
Vas = 0.013 m^3 = 0.457 ft^3
eta (2 pi) = 0.414%
Sensitivity 88.7dB/2.83v/m

 

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RE: Would Someone Be Willing, posted on November 30, 2020 at 08:29:07
airtime
Audiophile

Posts: 10665
Location: Arizona
Joined: February 4, 2003
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.

 

RE: Would Someone Be Willing, posted on November 30, 2020 at 11:14:01
tubav
Audiophile

Posts: 510
Joined: March 21, 2009
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?

 

Did you come across this push-pull design?, posted on November 30, 2020 at 11:56:19
Jonesy
Audiophile

Posts: 2377
Location: Winnipeg, Manitoba
Joined: September 1, 2005
Contributor
  Since:
March 1, 2018
Looks interesting.

Cheers!

Jonesy


"I know just enough to get into trouble. But not enough to get out of it."




 

RE: Would Someone Be Willing, posted on November 30, 2020 at 12:19:52
rivervalley817
Audiophile

Posts: 3524
Joined: June 15, 2020
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,



 

RE: Did you come across this push-pull design?, posted on November 30, 2020 at 12:25:10
tubav
Audiophile

Posts: 510
Joined: March 21, 2009
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.

 

RE: Did you come across this push-pull design?, posted on November 30, 2020 at 13:02:37
Jonesy
Audiophile

Posts: 2377
Location: Winnipeg, Manitoba
Joined: September 1, 2005
Contributor
  Since:
March 1, 2018
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."




 

RE: Would Someone Be Willing, posted on December 1, 2020 at 20:13:07
Duke
Dealer

Posts: 4416
Location: Princeton, Texas
Joined: March 31, 2000
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.

 

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