Anyone heard of them?

I'm looking to buy one of their 29 htz @ 12dB/oct inline subsonic filters...

http://www.hookeraudio.com/elec.html#

iirc they are a kinda crappy brand, but i'm sure that will do the job fine, there is not much to it. you could even make your own

Eh I don't really wanna try that. I was just looking for an inline subsonic and I don't really wanna pay 40 bucks for one.

I just wanna make sure they are so crappy it's gonna lower the quality of the signal going to my amp.

Thanks

I think Id rather use Fmods. plus with a Fmod you wont need another rca cable.

http://store.hlabs.com/pk4/store.pl?view_product=10

Like Manbeer says, you can make your own. It's just basically a line level lowpass filter. (Or is it highpass? I always mix the two up.....)

Which I think composes of a cap and resistor, in a basic first order network. (6db) I'm sure they can be configured in higher orders as well. The way the parts are configured determines whether it's high or low pass.

Google search high and low pass line level passive filters.

It's line level, usually in millivolts, so you can use smaller low wattage/voltage parts. The insertion losses are a lot less than a passive speaker level network, if at all I guess.

I'm not sure if this is the proper formula for this application or not. But you can use values of R and C to determine frequency, or determine frequency and noodle in values of R and C to match the frequency value. This would give values of R and C for a simple 6 db first order network with a known break point frequency.

1/2X3.14XRXC=F

I used the value for C as 0.1 uF for the sake of math. 6.28X0.1x50000=31400 31400/1=0.000031847.

The capacitance is noted in microfarad, (which is a millionth of a farad or some sh*t) so you have to move the decimal point over to the right six digits. So 31.847Hz, round it off to 32Hz.....

A 80K R will give a break point frequency, ( with 0.1 uF C) at 19.9Hz....20Hz...

Whether this formula evens relates to this application is beyond me, so take it with a grain of salt.

But you could build one or two for under ten bucks I would think.....

I think Id rather use Fmods. plus with a Fmod you wont need another rca cable.

http://store.hlabs.com/pk4/store.pl?view_product=10

x2

Ok. I could build one, but I have no idea what i'm doing in that area... I really have never built a crossover or anything more complex than a sub box

I was looking at the FMOD's, but they are just so damn expensive. Oh well. Everything has a price. The sad part about this is that I have a 28 hz @ 12 dB/oct subsonic on my amp, and it is always on, but I somehow managed to destroy my sub out of overexursion (and it has 30 mm of xmax).

So I'm getting this for a backup/sharper slope. Should I get 20 or 30 hz. My info is in my signature.

You are driving the sub at or just over RMS, but if you are tuned at 32 with a 28 Hz filter, somthing may be wrong if you are going over excursion.

Post up the complete dimensions of your box so we can make sure it is not tuned higher than you think it is.

Brian

i may have been misinformed but i was always under the impression that subs will unload HALF AN OCTAVE below tuning frequency? i have always set my SSF accordingly and so far so good. usually i would go about 10 hz below tune