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Old 17th January 2005, 01:00 PM   #11
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I prefer the pro amp + sub processor route

* don't need to mount amp in the box >>> design flexibility
* more watts for your dollar
* PA amps have more authority in my experience

You do need a processor, not BFD. You need things like a rumble filter, lowpass filter at the very least. A diy kit is a good way to go.
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Old 17th January 2005, 05:29 PM   #12
Bogie is offline Bogie  United States
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Okay - I'll figure on using a pro amp, along with a crossover and the BFD (hey, I'm already using it...).

My design models out to not have gnarsty cone excursion down to about 15 hz or so. A "rumble filter" is basically just a very low highpass, right?
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Old 17th January 2005, 05:34 PM   #13
simon5 is offline simon5  Canada
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Exactly, but if you can put the very low highpass before the pro amplifier, it's way cheaper in components when you work on a 5V signal or so.
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Old 18th January 2005, 04:37 AM   #14
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A rumble filter is a high pass filter, typically at 20 Hz or lower, often with a slope of 3rd - 6th order. If you model with WinISD you can find out what slope and corner frequency you need. I'd aim to make sure that the excursion below 20 Hz would never be greater than that above 20 Hz. If this is true, you aren't likely to have excursion problems with low signals. Some movie effects go down VERY low, keep in mind, sometimes as low as 2 Hz. Looking at my RTA when watching movies with low bass, I've noticed some rise in amplitude when you go down lower, which is likely to cause you excursion problems.

The basic idea of a rumble filter is to avoid overexcursion in the range that is too deep for your system to reproduce useable output. No sense giving up what you can hear for the sake of what you can't.
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Old 18th January 2005, 05:27 AM   #15
Bogie is offline Bogie  United States
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Just checked on WinISD, and a combination of a 4th order highpass at 15hz, and a bit of judicial use of a parametric equalizer, could keep cone excursion under control, while cutting spl only approx 1db at 20hz...

Hmmm... Now to pull out The Book From Hell, and see if I can figure out a 6th order filter...
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Old 18th January 2005, 05:51 AM   #16
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No need to reinvent the wheel, ESP have a 6th order rumble filter PCB ...
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Old 18th January 2005, 06:16 AM   #17
Bogie is offline Bogie  United States
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Paul...

I understand PCB, but what's ESP? I'm not psychic...

(grin)
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Old 18th January 2005, 07:20 AM   #18
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Elliot Sound Products

http://sound.westhost.com/
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Old 18th January 2005, 01:05 PM   #19
Bogie is offline Bogie  United States
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Hmmm... that stuff looks INTERESTING.

It's project 99, right?

I may also try the sub amp project.
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Old 18th January 2005, 01:11 PM   #20
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Correct.

I considered building an amp, but concluded in the end it was no way to save money. YMMV but I foudn it was more expensive than a NEW amp, and you don't get a warranty with diy. The only thing is, you learn from diy and you have a better chance of fixing it if anything goes wrong (very rare).
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