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4x 8" Subwoofer experiment.
4x 8" Subwoofer experiment.
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Old 13th January 2019, 07:40 PM   #21
Dr1v3n is offline Dr1v3n  United States
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Generally it's been said the one can't really hear where 20-80Hz is coming from. So even better when you feel the subsonic frequencies.

Just FYI I could only feel it when I was closer to the sub. So many nodes in the room cancelling out... I do have another sub on standby to be modified.
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Old 15th January 2019, 01:41 AM   #22
Think is offline Think  Netherlands
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4x 8" Subwoofer experiment.
Interesting experiment.
You still want the air in the room to vibrate, not the whole room with the air inside.

I have 8 jbl804 subwoofers and 2m piece of 200mm/8inch pvc pipe at home ..........

But 2 of them, each in a small closed box together in a corner of my room are way more then powerful enough and sound better then all the other 8" and 12" sealed, bass reflex and band-pass boxes I compared them with, all made by JBL and with same series drivers with an exception for the 2 8" bandbass boxes which are from pioneer. The 12" sealed are my 2nd choice.

I guess the smooth roll off (which is compensated by the room gain) from a sealed box is what I like about the differences in sound.

Please do yourself, cspieker and me a favor and put 1 or 2 drivers from the "another sub" in proper separate sealed boxes and compare them.
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Old 16th January 2019, 02:15 AM   #23
Dr1v3n is offline Dr1v3n  United States
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Think, thanks alot for your input I really appreciate it.... I am having recurring problems with these cheapo IR2092S 500AMP boards I got from eBay. They keep blowing out randomly... To fix this situation, using the same +-65V 2x 500W SMPS's, I decided to order 2x (250Wx2 IR2092S) Amps made by Sure and sold by PE. That way I'm done wasting money on poorly made product. I should have them in before next Monday. Hopefully good results!
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Old 16th January 2019, 02:43 AM   #24
Dr1v3n is offline Dr1v3n  United States
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Then I shall make progress, if the Amp situation is resolved, on sealing 2 drivers....
Interestingly enough, the 2 amps that failed last were the ones driving the outer drivers and I did not notice a 'real' difference in SPL at subsonic Freq's as I was testing sub20Hz at louder volumes. also, another plus is the Sure Amps have 1.1Vrms input sensitivity, so I'm not looking to mod the gain setting... Still I would steer anyone clear of the IRS2092S 500AMP's made in China. They're cheap, but they don't work.
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