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Old 25th March 2014, 08:17 PM   #2061
PASC is offline PASC  Brazil
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Hi!
David B.Weems, Desingning building and testing your own speaker system, page 16:
2 candles: one at the cone and another at the port.
At tuned frequency the one near the port vibrates and the one at the cone hardly moves, of at low Pe.
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Old 25th March 2014, 08:55 PM   #2062
DHAA is offline DHAA  United States
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Quote:
Originally Posted by PASC View Post
Hi!
David B.Weems, Desingning building and testing your own speaker system, page 16:
2 candles: one at the cone and another at the port.
At tuned frequency the one near the port vibrates and the one at the cone hardly moves, of at low Pe.
Regards,
I have always laid my speak on it back, with the cone facing upwards. I put a ball of lint on the cone, or even a little bit of salt. Then, using the sine wave generator, sweep through the frequencies until I it seems to cone is not moving (as indicated by the lint/salt no longer vibrating). But this seems to leave about a 5 Hz window, not the exact Fb frequency. Thanks for the candle technique tip - I will give it a try next time and see if it is more accurate.
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Old 26th March 2014, 02:30 PM   #2063
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Quote:
Originally Posted by DHAA View Post
Hey, the check is in the mail Mr. Lewis. Also, I just noticed your post #2018:

Single sheet TH challenge

Why don't you whip up a variation of that for the Dayton Pro PA385-S 15" subwoofer. Put a design out there and let people pick it apart.
Okay, pretty much the only 15 I've found that works well in the 190 litre cab is the Kappalite 3015LF, giving massive 98.5dB sensitivity. I've had simulations of up to a flat 99.5dB sensitivity but only from a reduced Mmd version of the B&C 18TBX100.
I have a 130L bass reflex cab simulation that the design works well in, but of course it will be less sensitive. The limitation of bass reflex is only being able to increase the sensitivity at the tuning frequency.
I have a more sensitive rear loaded/tapped bandpass horn (or scoop) simulation that it works well with. I haven't worked out how to fold it up yet. Bass reflex boxes are easy to build what you modelled! I originally used the 3015lf, then x the numbers by 13/19 (ratio of good bass reflex cab sizes).

Quote:
Originally Posted by DHAA View Post
And your Timplexx15 in post #2052 looks good - I like you word play with the name. Thanks
This was only a hornresp graph, but I got similar and consistent results with many woofers, and I found I got a more Simplexx - like drooping curve if I made the cab too small. You probably gain a bit higher voltage limit on the Simplexx, but I don't know much about them or have the plans.
Interestingly, 9 HL10 woofers sim well in the cab if you could fit them in or could be bothered to spend the money. There seems to be a 'driver equivalence' dependent on Fs and QTS. Where 1 x 3015LF ~ 2 x 3012LF ~ 4 x BP102 (I think judging from BFM cabs) ~ 9 x HL10 where response in the same cab is concerned.

The Timplexx 15 and DJ's Dream are the exact same cab (post 2018). I have a 'Timplexx 12' (unpopular on the BFM build thread!) that runs 3dB less sensitive (like the JBL curve only going to 40Hz). I can confirm solid output to the 38Hz HP on just 15 Volts when corner loaded in my flat (detached of course!). I can see my ball lamp shades move, can't wait to try 40 Volts! It also models well with the Faital Pro 15HP1060 giving 80 Volts!
Probably slightly better than a Tuba 18 or Autotuba, considering it uses an 8 ohm (though way more expensive) driver. There's an impedance rise in both cabs so that's why I've excluded horn impedance. In fact it seems MORE pronounced in bass reflex, albeit a lower minimum at tuning.
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Old 3rd April 2014, 06:35 PM   #2064
wg_ski is offline wg_ski  United States
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If you had to choose which was "better" for an SS15 - the Kappa 15LF (steel frame) or the Kappa P15LF2? Input 50V or less - for extension-cord-run-limited use. I have a couple spare LF2's, and I'm ordering some of the steel frame drivers for an unrelated hi-fi project. At 15% off right now, I could sneak in a couple extras and no one would notice.
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Old 23rd July 2014, 12:57 PM   #2065
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After simulating I see that the W750 from 18 Sound actually doesnt look bad in the SS15. So I have to build one now. Thanks another project added to the list.

I was selling them because they had been sitting in my shed. Now that the SS horn can use them I look forward to building one and seeing how I like it.
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Old 26th July 2014, 12:49 AM   #2066
xrk971 is online now xrk971  United States
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Has anyone tried this yet? 99dB, 12mm xmax, Qts 0.4....

http://prvaudio.com/pdf/15SW2000-4_Datasheet.pdf
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Old 26th July 2014, 08:12 AM   #2067
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Does about 130db from 54hz and up.

Click the image to open in full size.Click the image to open in full size.

This is with 61v to put it at Xmax around 62hz
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Old 27th July 2014, 05:26 PM   #2068
sine143 is offline sine143  United States
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Quote:
Originally Posted by TimLewis View Post
Okay, pretty much the only 15 I've found that works well in the 190 litre cab is the Kappalite 3015LF, giving massive 98.5dB sensitivity. I've had simulations of up to a flat 99.5dB sensitivity but only from a reduced Mmd version of the B&C 18TBX100.
I have a 130L bass reflex cab simulation that the design works well in, but of course it will be less sensitive. The limitation of bass reflex is only being able to increase the sensitivity at the tuning frequency.
I have a more sensitive rear loaded/tapped bandpass horn (or scoop) simulation that it works well with. I haven't worked out how to fold it up yet. Bass reflex boxes are easy to build what you modelled! I originally used the 3015lf, then x the numbers by 13/19 (ratio of good bass reflex cab sizes).


This was only a hornresp graph, but I got similar and consistent results with many woofers, and I found I got a more Simplexx - like drooping curve if I made the cab too small. You probably gain a bit higher voltage limit on the Simplexx, but I don't know much about them or have the plans.
Interestingly, 9 HL10 woofers sim well in the cab if you could fit them in or could be bothered to spend the money. There seems to be a 'driver equivalence' dependent on Fs and QTS. Where 1 x 3015LF ~ 2 x 3012LF ~ 4 x BP102 (I think judging from BFM cabs) ~ 9 x HL10 where response in the same cab is concerned.

The Timplexx 15 and DJ's Dream are the exact same cab (post 2018). I have a 'Timplexx 12' (unpopular on the BFM build thread!) that runs 3dB less sensitive (like the JBL curve only going to 40Hz). I can confirm solid output to the 38Hz HP on just 15 Volts when corner loaded in my flat (detached of course!). I can see my ball lamp shades move, can't wait to try 40 Volts! It also models well with the Faital Pro 15HP1060 giving 80 Volts!
Probably slightly better than a Tuba 18 or Autotuba, considering it uses an 8 ohm (though way more expensive) driver. There's an impedance rise in both cabs so that's why I've excluded horn impedance. In fact it seems MORE pronounced in bass reflex, albeit a lower minimum at tuning.
Tim, faital pro 15 1030 hp, 205 liters, folded, and built. 98.5db sensitivity down to about 43 hz.

OTH40C 15" loaded Compact TH Flat to 40hz
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Old Yesterday, 05:32 AM   #2069
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Did you ever post the Input page on you sub Sine?
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