50hz booster for subwoofer - Electronic Circuits Projects Diagrams Free

palesha · 25th March 2008, 03:53 PM

I saw one subwoofer amplifier with 18db 50hz boost.
What type of circuit they must hv used?
I will like to make one in my present subwoofer preamplifer.

crutschow · 25th March 2008, 06:11 PM

Typically such filters are active types using op amps.

Unless you know the characteristics of your room and subwoofer, a boost at 50 Hz may just end up making the subwoofer sound boomy. If you don't have one, the best way to characterize your subwoofer in the room is with a sound level meter and a frequency test source (generator or test cd).

For accurate matching of the sub to the room, an equalizer such as the Behringer DSP-1124P can be used which goes for about $100us. It's use is described at http://www.hometheatershack.com/forums/bfdguide/.

audioguru · 25th March 2008, 06:15 PM

A boost of 18dB requires 63 times more power from the amplifier.
So if the regular speakers have 10W then the sub-woofer needs to have 630W.

Why do you need to boost 50hz so much?

**Nigel Goodwin** · 25th March 2008, 07:00 PM

Quote:

Originally Posted by audioguru

Why do you need to boost 50hz so much?

He probably likes mains hum?

audioguru · 25th March 2008, 07:21 PM

I have an equalizer circuit that has a 10db peak at 35Hz. Then my 8" woofers sound and vibrate things like a sub-woofer. They rolloff below 60Hz so the EQ makes a big difference.

I haven't heard mains hum for many years. Years ago even my magnetic phono didn't play mains hum.

rmn_tech · 25th March 2008, 09:57 PM

How odd Here in the UK the one thing that we do not need to boost is 50Hz. I agree with Nigel.

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25th March 2008, 03:53 PM	(permalink)
palesha	50hz booster for subwoofer I saw one subwoofer amplifier with 18db 50hz boost. What type of circuit they must hv used? I will like to make one in my present subwoofer preamplifer.

25th March 2008, 06:11 PM	(permalink)
crutschow	Typically such filters are active types using op amps. Unless you know the characteristics of your room and subwoofer, a boost at 50 Hz may just end up making the subwoofer sound boomy. If you don't have one, the best way to characterize your subwoofer in the room is with a sound level meter and a frequency test source (generator or test cd). For accurate matching of the sub to the room, an equalizer such as the Behringer DSP-1124P can be used which goes for about $100us. It's use is described at http://www.hometheatershack.com/forums/bfdguide/.

25th March 2008, 06:15 PM	(permalink)
audioguru	A boost of 18dB requires 63 times more power from the amplifier. So if the regular speakers have 10W then the sub-woofer needs to have 630W. Why do you need to boost 50hz so much? __________________ Uncle $crooge

25th March 2008, 07:21 PM	(permalink)
audioguru	I have an equalizer circuit that has a 10db peak at 35Hz. Then my 8" woofers sound and vibrate things like a sub-woofer. They rolloff below 60Hz so the EQ makes a big difference. I haven't heard mains hum for many years. Years ago even my magnetic phono didn't play mains hum. __________________ Uncle $crooge

25th March 2008, 09:57 PM	(permalink)
rmn_tech	How odd Here in the UK the one thing that we do not need to boost is 50Hz. I agree with Nigel. __________________ I think, therefore I am. Therefore I must be !!! I think ???