Rumble Filter

soloxp · 17th July 2006, 06:40 PM

I found this (PIE Adjustable Line Driver with Subsonic Filter) and was thinking about buying it. Will this work like a rumble filter. I'm still looking for a rumble filter.

http://store.xmfanstore.com/linedriver.html

Thanks Solo

preiter · 17th July 2006, 07:04 PM

10 Hz sounds kind of low for a rumble filter.

A rumble filter should filter out frequencies below what the port on your sub is tuned to.

soloxp · 17th July 2006, 08:39 PM

My ports are tuned around 15-16hz.

AndrewT · 20th July 2006, 08:01 AM

Hi,
the posted filter/booster does not specify the steepness of the bass roll-off.
I would suggest that 2pole is too slow to be really effective.

Try building one based on 4pole (dual opamp/channel) or even 6pole (2duals/ch).

paulspencer · 22nd July 2006, 04:09 AM

You should simulate with WinISD pro to determine your requirements. Look at power and the excursion curve. Add filters and see what you get.

That unit looks fairly useless.

sreten · 27th July 2006, 12:02 PM

Hi,

just to add : the best sort of rumble filter is a peaking second order.
It is precisely tuned to very near the port frequency and usually has
adjustable Q for precise tuning of low bass levels.
The above implies that the normal 4th order roll-off of the sub is
overdamped and that you end up with a 6th order overdamped
extended bass alignment.

If all the above is done well then you also get a built in rumble filter.
(compared to simply driving with an amplifier with flat response)

/sreten.

17th July 2006, 06:40 PM	#1
soloxp diyAudio Member Join Date: Mar 2006 Location: Texas	Rumble Filter I found this (PIE Adjustable Line Driver with Subsonic Filter) and was thinking about buying it. Will this work like a rumble filter. I'm still looking for a rumble filter. http://store.xmfanstore.com/linedriver.html Thanks Solo

22nd July 2006, 04:09 AM	#5
paulspencer diyAudio Member Join Date: Sep 2003 Location: Melbourne, Australia	You should simulate with WinISD pro to determine your requirements. Look at power and the excursion curve. Add filters and see what you get. That unit looks fairly useless. __________________ Red Spade Audio Blog \| Writer for: Hifi Zine S3 Synergy horn + 18" active woofers + T20 horn sub + B&C active surrounds + Custom Acoustic Treatment

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17th July 2006, 07:04 PM	#2
preiter diyAudio Member Join Date: May 2006	10 Hz sounds kind of low for a rumble filter. A rumble filter should filter out frequencies below what the port on your sub is tuned to.

17th July 2006, 08:39 PM	#3
soloxp diyAudio Member Join Date: Mar 2006 Location: Texas	My ports are tuned around 15-16hz.

20th July 2006, 08:01 AM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, the posted filter/booster does not specify the steepness of the bass roll-off. I would suggest that 2pole is too slow to be really effective. Try building one based on 4pole (dual opamp/channel) or even 6pole (2duals/ch).

27th July 2006, 12:02 PM	#6
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, just to add : the best sort of rumble filter is a peaking second order. It is precisely tuned to very near the port frequency and usually has adjustable Q for precise tuning of low bass levels. The above implies that the normal 4th order roll-off of the sub is overdamped and that you end up with a 6th order overdamped extended bass alignment. If all the above is done well then you also get a built in rumble filter. (compared to simply driving with an amplifier with flat response) /sreten.