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Old 17th July 2006, 07:40 PM   #1
soloxp is offline soloxp  United States
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Default 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
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Old 17th July 2006, 08:04 PM   #2
preiter is offline preiter  United States
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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.
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Old 17th July 2006, 09:39 PM   #3
soloxp is offline soloxp  United States
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My ports are tuned around 15-16hz.
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Old 20th July 2006, 09:01 AM   #4
AndrewT is offline AndrewT  Scotland
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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).
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Old 22nd July 2006, 05:09 AM   #5
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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.
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Old 27th July 2006, 01:02 PM   #6
sreten is offline sreten  United Kingdom
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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.
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