here is my setup in a S10 Ext cab Stock Alt and battery 2 12" Fusion PowerPlants in a Custom Built ported box ported to 38hz and 2.2cuft of air for each sub! Audiobahn A8002T amplifier with SPL 4gauge amp kit. Pioneer DEGP4700MP HU Pioneer 6 1/2's TSG1640R in the doors and Pioneer 4x6's TSG4640R in the Dash. That is the setup! With that HU will I need an install kit? What dB's can you guys gess i would hit! Iknow it is about impossible to tell with out hearing it but just take a gess! my subs are going to be facing upward! Will that sound good?
not bad, the only thing i see that might cause a problem is your box is tuned kinda high, i would make it tuned lower to mabey 32-30hz, i would guess you will be hitting somwhere around 130-133db.
Zac, he's gonna port his box at 38 hz. A high pass filter at 15 - 20 hz isn't gonna help him. Anything between 30 - 35 is what I'd use. 15 - 20 is just too low for my taste, I'd be a little leary.
I know exactly what a subsonic filter does. Unfortunately, when I was younger I was running a ported box without filters, and had it unload on me. I learned a good lesson after that.
Filters are not like brick walls. Even with a 30 hz or so filter, which I would use, he won't even notice a huge difference from 30 - 25 hz compared to without a filter. The further you go, yes he's gonna be losing out on his low-end, but you have to make sacrifices somewhere.
He could be playing his sustem at pretty good steam, and hit a song that drops down to say 25 hz. He's now playing 13 hz below the port tune, that's a pretty big difference, and the box is not going to have very good control over the driver.
"at the subs Fs, the amp will hit a "wall of impedance"...that sub's Fs is 28.5hz."
You don't just hit a wall once you reach the driver's Fs, you hit a peak... If what you explain happened, there'd be a lot of people missing out of a large portion of the bass frequency spectrum.
Anonymous
Posted on
that all depends on the slope of the filter as well.
5hz below tuning frequency is a good rule of thumb. for him 30hz would be fine. set it at 20hz and 21hz is not filtered, that's not good.
Subs are extremely hard to control below their tuned enclosure frequency, and they suck a tremendous amount of power in the attempt. 13 hz is a long ways down, and a sub unloading isn't pretty. It loses all damping, and they usually end up blowing the cone right off.
I guess you didn't read anything I posted.... if you you want to be ignorant, go for it and set your filter to 20 hz. It's not my system, I could care less.
Filters are not like brick walls. Even with a 30 hz or so filter, which I would use, he won't even notice a huge difference from 30 - 25 hz compared to without a filter. The further you go, yes he's gonna be losing out on his low-end, but you have to make sacrifices somewhere.
He could be playing his sustem at pretty good steam, and hit a song that drops down to say 25 hz. He's now playing 13 hz below the port tune, that's a pretty big difference, and the box is not going to have very good control over the driver.
Joe knows what he's talking about. I'll vouch for him.
