jbl gto804 tapped horn/ folded horn - Page 6

NEO Dan · 17th January 2012, 07:00 PM

Just thinking about these type of enclosures; if one were to leave the top off and just flip it upside down on the carpet you could probably get by for testing as long as you weighted it down sufficiently to prevent any leaks or rattles.

NEO Dan · 17th January 2012, 07:02 PM

~26Hz, but it'll be a bit lower with the stuffing.

NEO Dan · 17th January 2012, 08:29 PM

Lower yet now that I think about it. I think this will need stuffed for the additional length of the bottom section. Would imagine it will push you into the low 20Hz range. I'll send data to b and see if he has a comment.

BP1Fanatic · 18th January 2012, 02:54 AM

I went to vote for you NeoDan, but I don't do FaceBook or Tweet. That F1 car is NASTY tho'!!!

NEO Dan · 18th January 2012, 10:29 AM

LOL,
Hope you are kidding BP1, I don't have anything entered. I am considering buying the render plugin though.

2009thread1 · 18th January 2012, 01:20 PM

okay so if i stuff the box it should bring the tuning down, and hopefull i wont get port noise

NEO Dan · 18th January 2012, 02:43 PM

Stuffing will be necessary for reasons other than LF tuning, the stuffing is also used to dampen the resonant modes that occur at the upper end of the range. What do you use for a crossover to filter the high frequencys from the subwoofer? It'll sound like shite if you don't use a filter. Really you should have filtering to remove content on both the high and low ends of the spectrum, filtering off the lows below tuning will help protect against bottoming the drivers.

2009thread1 · 18th January 2012, 03:05 PM

i use a passive crossover as my amp doesnt have a low pass filter, it cuts off around 100hz

NEO Dan · 18th January 2012, 03:28 PM

So you run the whole system off the Denon?

2009thread1 · 18th January 2012, 04:43 PM

no i run a pair off q acoustics 2020 of the denon, and i have a power amplifier (pa amplifier) which is 250 watts rms to each channel that i use for my subs, with passive crossovers

17th January 2012, 07:00 PM	#51
NEO Dan diyAudio Member Join Date: Jun 2008	Just thinking about these type of enclosures; if one were to leave the top off and just flip it upside down on the carpet you could probably get by for testing as long as you weighted it down sufficiently to prevent any leaks or rattles. __________________ Regards, Dan

17th January 2012, 07:02 PM	#52
NEO Dan diyAudio Member Join Date: Jun 2008	~26Hz, but it'll be a bit lower with the stuffing. __________________ Regards, Dan

17th January 2012, 08:29 PM	#53
NEO Dan diyAudio Member Join Date: Jun 2008	Lower yet now that I think about it. I think this will need stuffed for the additional length of the bottom section. Would imagine it will push you into the low 20Hz range. I'll send data to b and see if he has a comment. __________________ Regards, Dan

18th January 2012, 10:29 AM	#55
NEO Dan diyAudio Member Join Date: Jun 2008	LOL, Hope you are kidding BP1, I don't have anything entered. I am considering buying the render plugin though. __________________ Regards, Dan

18th January 2012, 02:43 PM	#57
NEO Dan diyAudio Member Join Date: Jun 2008	Stuffing will be necessary for reasons other than LF tuning, the stuffing is also used to dampen the resonant modes that occur at the upper end of the range. What do you use for a crossover to filter the high frequencys from the subwoofer? It'll sound like shite if you don't use a filter. Really you should have filtering to remove content on both the high and low ends of the spectrum, filtering off the lows below tuning will help protect against bottoming the drivers. __________________ Regards, Dan


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18th January 2012, 02:54 AM	#54
BP1Fanatic diyAudio Member Join Date: Jan 2009 Location: Columbus, Ohio	I went to vote for you NeoDan, but I don't do FaceBook or Tweet. That F1 car is NASTY tho'!!!

18th January 2012, 01:20 PM	#56
2009thread1 diyAudio Member Join Date: Nov 2011	okay so if i stuff the box it should bring the tuning down, and hopefull i wont get port noise

18th January 2012, 03:05 PM	#58
2009thread1 diyAudio Member Join Date: Nov 2011	i use a passive crossover as my amp doesnt have a low pass filter, it cuts off around 100hz

18th January 2012, 03:28 PM	#59
NEO Dan diyAudio Member Join Date: Jun 2008	So you run the whole system off the Denon? __________________ Regards, Dan

18th January 2012, 04:43 PM	#60
2009thread1 diyAudio Member Join Date: Nov 2011	no i run a pair off q acoustics 2020 of the denon, and i have a power amplifier (pa amplifier) which is 250 watts rms to each channel that i use for my subs, with passive crossovers

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