Would this crossover work for my sub woofer.

dmrgarry · 13th July 2011, 07:58 PM

Ok so im building a sub woofer box for an old sub a friend gave me, I have a crossover from the inside of a technics speaker, the crossover has wires for a tweeter, midrange and sub, if I wired the sub up would I get all the power going through to the sub?

please dont try to kill me if this is totally newbie, gotta start somewhere, thanks, harry

weltersys · 13th July 2011, 09:18 PM

Quote:

Originally Posted by dmrgarry

Ok so im building a sub woofer box for an old sub a friend gave me, I have a crossover from the inside of a technics speaker, the crossover has wires for a tweeter, midrange and sub, if I wired the sub up would I get all the power going through to the sub?

please dont try to kill me if this is totally newbie, gotta start somewhere, thanks, harry

Harry,

If you connect the amp to the input of the passive crossover, and wire the sub up to the woofer output of the crossover, if the sub speaker's TS parameters are identical to the Technics speaker, the subs upper response will be rolled off (probably around 300 or 400 Hz, three or four octaves higher than subs are normally crossed) and (basically) nothing will happen to the sub's low response.

Since it is unlikely that the sub's TS parameters are identical to the Technics speaker, some goofy response curve will probably result.

Passive crossovers are difficult to "get right", even with test equipment.

Have fun, good luck.

Art

revboden · 13th July 2011, 09:31 PM

the LF tap on that board is for a woofer not a subwoofer. The filter is set for between 500 and 800hz. 80-800hz is woofer territory. sorry.

dmrgarry · 13th July 2011, 10:11 PM

what? thats confusing haha, the crossover is from a technics sb-cs7 speaker box, the woofer or low range driver or whatever played right down to 30 hz.. well moved, it sounded good until 40 hz, so I either dont know what Im talking about or something

pinkmouse · 13th July 2011, 10:48 PM

Threads merged.

sreten · 13th July 2011, 11:23 PM

Hi,

The crossover determines the upper roll-off, not the bass extension,
it won't work. Get a plate subwoofer amplifier, its far more flexible.

rgds, sreten.

13th July 2011, 07:58 PM	#1
dmrgarry diyAudio Member Join Date: Feb 2011	Would this crossover work for my sub woofer. Ok so im building a sub woofer box for an old sub a friend gave me, I have a crossover from the inside of a technics speaker, the crossover has wires for a tweeter, midrange and sub, if I wired the sub up would I get all the power going through to the sub? please dont try to kill me if this is totally newbie, gotta start somewhere, thanks, harry

13th July 2011, 10:48 PM	#5
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	Threads merged. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

13th July 2011, 11:23 PM	#6
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, The crossover determines the upper roll-off, not the bass extension, it won't work. Get a plate subwoofer amplifier, its far more flexible. rgds, sreten. __________________ There is nothing so practical as a really good theory - Ludwig Boltzmann When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

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13th July 2011, 09:31 PM	#3
revboden diyAudio Member Join Date: Feb 2011	the LF tap on that board is for a woofer not a subwoofer. The filter is set for between 500 and 800hz. 80-800hz is woofer territory. sorry.

13th July 2011, 10:11 PM	#4
dmrgarry diyAudio Member Join Date: Feb 2011	what? thats confusing haha, the crossover is from a technics sb-cs7 speaker box, the woofer or low range driver or whatever played right down to 30 hz.. well moved, it sounded good until 40 hz, so I either dont know what Im talking about or something

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