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25Hz for !! Dayton 299-114 1301469W
25Hz for !! Dayton 299-114 1301469W
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Old 17th December 2016, 08:25 AM   #1
ODougbo is offline ODougbo  United States
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Default 25Hz for $25!! Dayton 299-114 1301469W

I wanted to try an Isobaric with a removable cylindrical container and made a "one piece motor" by gluing 3/4" x 3/4" rings together. The setup was way better than previous attempts.
1. cut the inter circle first
2. use the waste/cutout to center the piece to the sliding table (2nd pic top).
3. glue together with spring clamps, etc.

Box size, 1 cubic foot with deductions for venting and cylindrical container calculated in.

The woofer is a Buyout from PE, very low cost but well made.
Simulated in WinIsd, clearly shows a response down to 25hz.

299-114 subwoofer speaker features a deep profile, long fiber, high-pulp cone finished beautifully in a protective coating that also dampens resonances. The 1-1/2" diameter 4-layer voice coil's 5/8" winding length maintains plenty of copper in the magnetic gap, ensuring plenty of high-impact, low-distortion output. A vented pole piece reduces performance-robbing power compression, and the magnet structure's extended back plate prevents "bottoming out" the long voice coil. Great subwoofer speaker for any design or application, particularly multimedia systems, small home theater setups, and multi-driver configurations.

Specifications:
*Power handling: 80 watts RMS/160 watts max
*VCdia: 1-1/2"
*Le: 1.61 mH
*Impedance: 4 ohms
*Re: 3.25 ohms
*Frequency response: 35-2,000 Hz
*Fs: 38 Hz *SPL: 83.5 dB 1W/1m
*Vas: 0.55 cu. ft. *Qms: 6.74
*Qes: 0.64 *Qts: 0.59
*Xmax: 4.5 mm
*OD: 6-1/2"

A few more finish steps to go, will be testing soon though.
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Old 17th December 2016, 11:56 AM   #2
adason is offline adason  United States
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Nicely done!
Have you considered isobaric with just two woofers mounted on the same baffle each from opposite side in clam arrangement? Not only it is much simpler, but it reduces distortion.
Furthermore, you hear the sound radiating from the back of woofer, which reduces higher frequencies, making crossover easier.
I am very fond of isobaric.
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Old 17th December 2016, 02:01 PM   #3
Sonce is offline Sonce  Macedonia
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Quote:
Originally Posted by ODougbo View Post
Simulated in WinIsd, clearly shows a response down to 25hz.
Shape of the simulated response is poor (bad sound quality) because tuning frequency is too low. Try with other box volume also.
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Old 17th December 2016, 06:52 PM   #4
ODougbo is offline ODougbo  United States
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Thanks Adason, will try that configuration, and back to back magnet (with different diy cylinders).

Sonce, so don't know, so far the lightweight box is digging down really low and exceeded all my expectations. When WinIsd defaulted to 25hz I didn't even consider making it smaller, what are you recommending? .75 cubic foot?

In any case, I'm starting to believe....to get a good subwoofer sound, buy a dedicated subwoofer amp, with high end filter e.g. Dayon SA 230 or SA 1000.
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Old 17th December 2016, 08:33 PM   #5
Sonce is offline Sonce  Macedonia
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Back to back magnet is just waste of box volume, Adason has much better recommendation.
Box with 1 cubic foot and low 25 Hz tuning has high group delay. Simulate 0.6 cubic foot volume with 27 Hz tuning - better group delay with about the same F3, but check if port length is feasible.
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Old 18th December 2016, 12:21 PM   #6
ODougbo is offline ODougbo  United States
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Thanks! I did sim .6 and the response looked odd on my screen, I'll reload the parameters and try again.
If .6 is feasible - but not a workable because of super long port length, could add a second drive unit. (total 4 drivers)

However, here's a room response with mic in middle of room using the 1cf box. I reset the processor to factory default, so there shouldn't be any eq. The box is located in corner of room, on 8" stand.

Sure enough, 25hz!! but again a 40hz dip; something about the room I guess
[same results as other projects]

btw, the port is 10"wide x 1/2" x 18-3/4" It was supposed to be 18" long but forgot about the deduct for the 3/4" baffle.



Quote:
Originally Posted by Sonce View Post
Box with 1 cubic foot and low 25 Hz tuning has high group delay. Simulate 0.6 cubic foot volume with 27 Hz tuning - better group delay with about the same F3, but check if port length is feasible.
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Last edited by ODougbo; 18th December 2016 at 12:26 PM.
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Old 18th December 2016, 03:26 PM   #7
Ron E is offline Ron E  United States
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While a 6" woofer with 4mm xmax will do 25Hz, it won't go very loud doing so. Might be worth putting each in a 1ft^3 box tuned to ~30Hz (non isobaric) and running stereo subs.

Are the coils in the isobaric series or parallel?
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Last edited by Ron E; 18th December 2016 at 03:32 PM.
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Old 18th December 2016, 04:06 PM   #8
Sonce is offline Sonce  Macedonia
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Quote:
Originally Posted by ODougbo View Post
but again a 40hz dip; something about the room I guess
Yes, 40 Hz dip is room related, put microphone in your listening position and move the subwoofer around the walls.
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Old 18th December 2016, 04:09 PM   #9
Sonce is offline Sonce  Macedonia
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Quote:
Originally Posted by Ron E View Post
Might be worth putting each in a 1ft^3 box tuned to ~30Hz (non isobaric) and running stereo subs.
Good advice!
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Old 19th December 2016, 01:00 PM   #10
djn is offline djn  United States
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All gone at PE. Too bad. Heck of a deal.
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