Portable speakers, 5.25 subwoofer, passive radiator; cylindrical - diyAudio
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Old 25th November 2013, 10:16 PM   #1
tigox is offline tigox  Portugal
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Post Portable speakers, 5.25 subwoofer, passive radiator; cylindrical

Hello there fellas, i've been working on portable 2.1 speaker cylindrical shaped, so basically i am going to use a 5.25 kevlar subwoofer (902.420) and i was thinking of using a 5.25 passive radiator, the question is, on WinISD, 38Hhz are located ate -7db, the subwoofer is rated at 100W and my amplifier would feed it around 60 RMS, so, is -7db too low? should i go with a port instead of goig with the PR?

Below is images of the speakers, and WinISD tests (vented- white line; purple-PR and yellow-sealed). On the sketchup, the PR is on top and the sub on the bottom.

Click the image to open in full size.

Click the image to open in full size.


Click the image to open in full size.

Any help would be appreciated

Last edited by tigox; 25th November 2013 at 10:17 PM. Reason: title mistake
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Old 27th November 2013, 06:16 AM   #2
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(It's good to measure Skytronic drivers)
In a standard application (original spec) a BR 5-7L doesn't look that bad tuned to 45Hz. Port 5cm, 37/38cm long. (F-6 dB 40 Hz)
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Old 27th November 2013, 08:27 AM   #3
tigox is offline tigox  Portugal
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Quote:
Originally Posted by Inductor View Post
(It's good to measure Skytronic drivers)
In a standard application (original spec) a BR 5-7L doesn't look that bad tuned to 45Hz. Port 5cm, 37/38cm long. (F-6 dB 40 Hz)
Thank you so much for your reply, but about the port, is it too bad what I have with the radiator? Because it's basically part of the design having the PR
Thank you
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Old 27th November 2013, 01:11 PM   #4
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I don't know your speaker specs. Enclosure volume, tunning and PR specs.
If you do the calibration-simul. from port to PR it should be fine.
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Old 27th November 2013, 01:29 PM   #5
tigox is offline tigox  Portugal
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Originally Posted by Inductor View Post
I don't know your speaker specs. Enclosure volume, tunning and PR specs.
If you do the calibration-simul. from port to PR it should be fine.
What exactly do you mean by saying port to pr simulation?
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Old 27th November 2013, 02:24 PM   #6
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Go to the SPL tab, not the Transfer Function.

There you can compare the boxes much better. Post pics.
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Old 27th November 2013, 06:44 PM   #7
tigox is offline tigox  Portugal
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Quote:
Originally Posted by mdeni View Post
Go to the SPL tab, not the Transfer Function.

There you can compare the boxes much better. Post pics.

Thank you for the tip, i did not know this function
Anyway, here are the pics of the vented at it's fs and also the PR:

Click the image to open in full size. PR

Click the image to open in full size. VENTED

so they're both at about 75-80db, is that good or bad?

Last edited by tigox; 27th November 2013 at 06:51 PM.
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Old 27th November 2013, 11:22 PM   #8
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"portable"... is this for outdoor use?
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Old 27th November 2013, 11:27 PM   #9
tigox is offline tigox  Portugal
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Originally Posted by bitSmasher View Post
"portable"... is this for outdoor use?
sort of, yeah, it's the kind of speakers to have at the pool side i guess haha
why, do you have doubts of it being portable?
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Old 28th November 2013, 02:04 AM   #10
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I do question the amplifier power you're quoting, and also wonder if it's worth pursuing bass reproduction on a small scale outdoors
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