how connect to subwoofer?

alejo · 25th November 2004, 04:10 PM

Hello, I want upgrade my system adding one sobwoofer.

How connect this?

I draw diagram, add the blue circuit is correct?

if not, how obteing signal for sw?

Bill Fitzpatrick · 25th November 2004, 09:39 PM

No one else is answering so...

It is NOT correct if you expect the pot to function as a volume control.

Replace the pot with 2 resistors, about 22K or so, and tie the junction to the - input of an op-amp. The output of the op-amp can go to the filter. After the filter place a volume control.

alejo · 26th November 2004, 03:11 PM

Ok.
explained of another form: I have a CD, and valve amplifier, and need conect the subwoofer but I do not have output for this.

How obteing a signal sample?

subwoofer IN is only for low level.

thanks
alejo

Bill Fitzpatrick · 26th November 2004, 04:26 PM

You don't like my suggestion?

alejo · 26th November 2004, 04:41 PM

Yes Bill and thank you very much to respond to me !!!,

only want another opinion.

Original Burnedfingers · 26th November 2004, 08:59 PM

Alejo

Use a 5532 op amp with a regulated +15 and -15 volt supply. Take two 15K resistors to the - input of the op amp and provide your hot signal to these resistors from each channel. A 15K from the noninverting input to ground should work ok. Stick a pot from the inverting input to the output of say 50K or so. This will provide anything from less than unity to way more than unity gain for the buffer stage. This will provide the ability to control your low frequency and sum your signal.

Note* May need to check phase of low frequency output.

Ground the unused portion of your op amp. Some say it causes noise.

Bill Fitzpatrick · 26th November 2004, 11:06 PM

Well, there's your second opinion. Same as mine except for the minor difference in resistor values and the location of the pot.

Original Burnedfingers · 26th November 2004, 11:45 PM

Bill Fitzpatrick

Your values will work fine. The only difference would be the total gain available.

alejo

There you go ...another opinion. Its the easiest and best way.

alejo · 29th November 2004, 12:06 PM

Thanks Bill Fitzpatrick and burnedfingers for your reply.

Today I´start to work in this proyect.

Alejo

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25th November 2004, 09:39 PM	#2
Bill Fitzpatrick diyAudio Member Join Date: Jun 2001 Location: Eugene, OR	No one else is answering so... It is NOT correct if you expect the pot to function as a volume control. Replace the pot with 2 resistors, about 22K or so, and tie the junction to the - input of an op-amp. The output of the op-amp can go to the filter. After the filter place a volume control.

26th November 2004, 03:11 PM	#3
alejo diyAudio Member Join Date: Jun 2004 Location: bs.as.	Ok. explained of another form: I have a CD, and valve amplifier, and need conect the subwoofer but I do not have output for this. How obteing a signal sample? subwoofer IN is only for low level. thanks alejo

26th November 2004, 04:26 PM	#4
Bill Fitzpatrick diyAudio Member Join Date: Jun 2001 Location: Eugene, OR	You don't like my suggestion?

26th November 2004, 04:41 PM	#5
alejo diyAudio Member Join Date: Jun 2004 Location: bs.as.	Yes Bill and thank you very much to respond to me !!!, only want another opinion.

26th November 2004, 08:59 PM	#6
Original Burnedfingers diyAudio Member Join Date: Nov 2002	Alejo Use a 5532 op amp with a regulated +15 and -15 volt supply. Take two 15K resistors to the - input of the op amp and provide your hot signal to these resistors from each channel. A 15K from the noninverting input to ground should work ok. Stick a pot from the inverting input to the output of say 50K or so. This will provide anything from less than unity to way more than unity gain for the buffer stage. This will provide the ability to control your low frequency and sum your signal. Note* May need to check phase of low frequency output. Ground the unused portion of your op amp. Some say it causes noise.

26th November 2004, 11:06 PM	#7
Bill Fitzpatrick diyAudio Member Join Date: Jun 2001 Location: Eugene, OR	Well, there's your second opinion. Same as mine except for the minor difference in resistor values and the location of the pot.

26th November 2004, 11:45 PM	#8
Original Burnedfingers diyAudio Member Join Date: Nov 2002	Bill Fitzpatrick Your values will work fine. The only difference would be the total gain available. alejo There you go ...another opinion. Its the easiest and best way.

29th November 2004, 12:06 PM	#9
alejo diyAudio Member Join Date: Jun 2004 Location: bs.as.	Thanks Bill Fitzpatrick and burnedfingers for your reply. Today I´start to work in this proyect. Alejo

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