Very newb question

jaws2421 · 28th December 2005, 06:09 PM

As you can see from the title I am just dipping my toes into the water here. I come from the projection side of diy and I am an audophile as well. I can solder fairly well but not that great at understanding circuit designs. All i really want to do is build my own 10" or 12" sub box for HT with a descent amp, possibly this one 250W Subwooder amp . I am kinda tight on my budget wichi is directly proportional to gas prices and tuition

. I do not really want to exceed $300 at most, less is more prefered. I just want something that will pack a gorgeous punch, lol better then my little 6.25" magnavox TIB sub. I would reather learn how to read the circuitry and give it a shot myself but it's probably easier to make suggestions. Any help is greatly appreciated.

jaws2421 · 28th December 2005, 06:15 PM

oh yea, the LM3886 from chipamps (chipamps LM3886) looks like something i could assembly fairly easily on my own. Unless for me being new, if it would simply be better to buy an already assembled amp.

AndrewT · 29th December 2005, 08:03 AM

Hi,
go and read Leach from cover to cover. http://users.ece.gatech.edu/~mleach/lowtim/bckgrnd.html
and ESP http://sound.westhost.com

jaws2421 · 29th December 2005, 12:46 PM

Hi Andrew, thank you for some direction

lineup · 29th December 2005, 12:56 PM

If you buy subwoofer elements with good effiency ( >96 dB SPL per Watt )
you may use less power.
Maybe even a LM3886 Chip Amp ( 60 Watt ) will give enough power to shake your house.

60 Watt into 96 dB SPL
gives same Sound Pressure Level as
240 Watt into 90 dB SPL

Each 3 dB is like doubleing power of amplifier.

jaws2421 · 29th December 2005, 02:04 PM

hey there lineup,
thanks bro i never knew that regarding db's. Just thought the higher the louder but no correlated to wattage. I was considering using the 250w amp i posted before with an infinity sub here. The sub is 4 ohms so the amp should be pressing around 272W assuming the specs are right on the money. Or this sub , which cost more but goes down to 18hz

lineup · 29th December 2005, 02:19 PM

» 12" 4-ohm subwoofer
» polypropylene woofer cone with large-roll rubber surround
» innovative basket design
» frequency response: 23-400 Hz
» power range: 60-300 watts RMS (1,000 watts peak power)
» sensitivity: 93 dB
» progressive spider design
» top-mount depth: 5"
» sealed box volume: 1.25 cu. ft.
» ported box volume: 2.0 cu. ft.

Gives 93 dB per 1 Watt at a distance of 1 meter from Loudspeaker.
It is better sensitivity/effiency than a normal.
Many normal loudspeakers you buy, is like 88-90dB at 1 Watt.

001 W = 93 dB sound level
002 W = 96
004 W = 99
008 W =102
016 W =105 dB
032 W =108
064 W =111
128 W =114 dB

jaws2421 · 29th December 2005, 05:46 PM

hey lineup out of curiosty what setup are you running?

28th December 2005, 06:09 PM	#1
jaws2421 diyAudio Member Join Date: Jun 2004 Location: Manchester, New Jersey	Very newb question As you can see from the title I am just dipping my toes into the water here. I come from the projection side of diy and I am an audophile as well. I can solder fairly well but not that great at understanding circuit designs. All i really want to do is build my own 10" or 12" sub box for HT with a descent amp, possibly this one 250W Subwooder amp . I am kinda tight on my budget wichi is directly proportional to gas prices and tuition . I do not really want to exceed $300 at most, less is more prefered. I just want something that will pack a gorgeous punch, lol better then my little 6.25" magnavox TIB sub. I would reather learn how to read the circuitry and give it a shot myself but it's probably easier to make suggestions. Any help is greatly appreciated.

29th December 2005, 12:56 PM	#5
lineup diyAudio Member Join Date: Dec 2005 Location: the north	If you buy subwoofer elements with good effiency ( >96 dB SPL per Watt ) you may use less power. Maybe even a LM3886 Chip Amp ( 60 Watt ) will give enough power to shake your house. 60 Watt into 96 dB SPL gives same Sound Pressure Level as 240 Watt into 90 dB SPL Each 3 dB is like doubleing power of amplifier. __________________ lineup

29th December 2005, 02:19 PM	#7
lineup diyAudio Member Join Date: Dec 2005 Location: the north	» 12" 4-ohm subwoofer » polypropylene woofer cone with large-roll rubber surround » innovative basket design » frequency response: 23-400 Hz » power range: 60-300 watts RMS (1,000 watts peak power) » sensitivity: 93 dB » progressive spider design » top-mount depth: 5" » sealed box volume: 1.25 cu. ft. » ported box volume: 2.0 cu. ft. Gives 93 dB per 1 Watt at a distance of 1 meter from Loudspeaker. It is better sensitivity/effiency than a normal. Many normal loudspeakers you buy, is like 88-90dB at 1 Watt. 001 W = 93 dB sound level 002 W = 96 004 W = 99 008 W =102 016 W =105 dB 032 W =108 064 W =111 128 W =114 dB __________________ lineup

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28th December 2005, 06:15 PM	#2
jaws2421 diyAudio Member Join Date: Jun 2004 Location: Manchester, New Jersey	oh yea, the LM3886 from chipamps (chipamps LM3886) looks like something i could assembly fairly easily on my own. Unless for me being new, if it would simply be better to buy an already assembled amp.

29th December 2005, 08:03 AM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, go and read Leach from cover to cover. http://users.ece.gatech.edu/~mleach/lowtim/bckgrnd.html and ESP http://sound.westhost.com

29th December 2005, 12:46 PM	#4
jaws2421 diyAudio Member Join Date: Jun 2004 Location: Manchester, New Jersey	Hi Andrew, thank you for some direction

29th December 2005, 02:04 PM	#6
jaws2421 diyAudio Member Join Date: Jun 2004 Location: Manchester, New Jersey	hey there lineup, thanks bro i never knew that regarding db's. Just thought the higher the louder but no correlated to wattage. I was considering using the 250w amp i posted before with an infinity sub here. The sub is 4 ohms so the amp should be pressing around 272W assuming the specs are right on the money. Or this sub , which cost more but goes down to 18hz

29th December 2005, 05:46 PM	#8
jaws2421 diyAudio Member Join Date: Jun 2004 Location: Manchester, New Jersey	hey lineup out of curiosty what setup are you running?

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