New 21" neo sub driver coming soon to Parts Express - Page 2 - AVS Forum | Home Theater Discussions And Reviews
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post #31 of 40 Old 09-05-2018, 12:12 PM
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If patient, a B&C 21SW152-4 can be had for just a little more.
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post #32 of 40 Old 09-05-2018, 07:46 PM
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Quote:
Originally Posted by JediFonger View Post
so someone else would need to extend the design of the suggested box to make under 20Hz higher than 100dB yes?


Yes, don’t get caught up on the DB’s. You model to what you want with the expected power handling you want and see if your final output is capable of 100db at 20hz.


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post #33 of 40 Old 09-05-2018, 08:07 PM
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This driver in 12 cubic feet tuned to 20hz will hit 100db with only 14 watts of power. With a max of around 120db at 20hz.

(Assuming the specs are accurate)
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post #34 of 40 Old 09-05-2018, 11:13 PM
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Quote:
Originally Posted by notnyt View Post
You might want to try something like hornresp with more complex induction modeling. It will still be similar, but will show close to reality than winisd.


WinISD is a quick tool to use, I took some time to throw it around in a few boxes tuner low and high (30hz) on hornresp and yea it was slightly different but the overall was still there. I’m curious if these have the same response in a 6th order box as the DS115.


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post #35 of 40 Old 09-09-2018, 02:34 AM
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Originally Posted by EndersShadow View Post
If I had to guess you see more 8 ohm subs (and SVC at that) because they anticipate them being run in multiples, or if for pro audio, in horns or open baffle, both of which require significantly less power.

That is correct Sir...... SMALL gigs have 8 subs.....

Wish List: LLT Sub Dual UM-18, 25 cuft 12Hz tune. Anthology http://www.speakerdesignworks.com/Anthology_1.html
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post #36 of 40 Old 09-09-2018, 02:40 AM
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Originally Posted by 18Hurts View Post
This is just my PA concept so your mileage may vary.

Back in the day, the 90's specifically I ran PA both inside a building and outside in mother nature.


--SNIP--

Just a thought from an ex-weekend warrior slinging boxes--a back is a terrible thing to waste.

I totally agree with your assessment as a fellow soundman.....


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Wish List: LLT Sub Dual UM-18, 25 cuft 12Hz tune. Anthology http://www.speakerdesignworks.com/Anthology_1.html
DIY so far: LCR (RCF H100 3way) 2 - Full MARTY 460HO ( PIX from OLD profile) https://www.avsforum.com/forum/155-d...l#post39937738
2- VBSS and a DIY Bass Shaker
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post #37 of 40 Old 01-24-2019, 08:23 AM
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anyone try one of these yet?

Receiver : Pioneer Elite SC-95
Front Speakers: 3 DIYSG 1099's
Surround Speakers:2 DIYSG Volt 10's Atmos: 2 DIYSG Volt 6's
Subwoofers: Dual LaVoce SAN214.50 21's in Cyclops enclosures w/Inuke 6000 DSP
Nearfield: 2 Dayton HO 15's w/Inuke 6000DSP
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post #38 of 40 Old 01-24-2019, 02:03 PM
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Quote:
Originally Posted by DaBateman View Post
Yes it’s ridiculous.

I have an 18” Pro woofer that’s rated 30Hz to 3.5kHz in a 9.6cuft box tuned to 19Hz. It sounds awesome & only needs 200wts to hit reference.
So hopefully this is a bit less ignorant question on the issue: do you have to employ a filter at the fs in that scenario as you would with a tweeter?
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post #39 of 40 Old 01-24-2019, 02:21 PM
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The filter I believe you speak of for a tweeter is to prevent a peak in the shape of the passive highpass due to the impedance spike at the tweeter's FS.

Since subwoofer systems are normally active there is no such need for a filter like that at the FS of the driver since they are unaffected by impedance. That said you still need to employ a high pass if using the driver in a ported enclosure in order to prevent over-excursion below the tuning point of the enclosure where backpressure no longer keeps the cone excursion in check.
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post #40 of 40 Old 01-24-2019, 02:22 PM
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New 21" neo sub driver coming soon to Parts Express

Quote:
Originally Posted by LinkwitzTransform View Post
So hopefully this is a bit less ignorant question on the issue: do you have to employ a filter at the fs in that scenario as you would with a tweeter?


No. You would use a high pass filter at or just below port tuning.

Edit: MTG90 beat me to the answer by 8 seconds...

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